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"ABSTRACTSouth and Central Palembang Sub-basins have shale hydrocarbon which are considerably promising in the Talang Akar and Lemat/Lahat Formations. Seismic interpretation results shows potential of shale hydrocarbon scattered in several areas around the Rukam-l, Kemang-l, SInga-l and Tepus'l wells. Generally, thermal modelingg results indicate early maturity of oil on the value of Ro= 0.6% at about 2000m depth (h), the oil generation value Ro=(0.7-0.9)% at between (2200 £ h<3100)m depth and the oil generation Ro values between (0.9-1.2)% at a depth between (3100-3500m, Talang Akar and Lahat/Lemat Formations have a shallow marine depositional environment with Type II/III kerogen and lacustrine with Type III kerogen respectively. Based on advanced seismic data processing (seismic attributes and spectral decomposition) these areas are expected to have TOC>value2%. The calculation (P-50) of potential unconventional oil and gas recources at Talang Akar and Lahat/Lemat Formations is estimated to be fairly large (up tp 4200 MMBOE)(Author)"

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Daerah penelitian merupakan suatu struktur penghasil hidrokarbon konvensional yang terletak di bagian tenggara Cekungan Sumatra Selatan dan di bagian baratlaut tinggian lampung. Penelitian ini bertujuan untuk mengevaluasi  potensi  shale hidrokarbon  pada daerah tersebut. Evaluasi shale hidrokarbon dilakukan pada tiga sumur, sumur X-1, X-2 dan X-3 dengan target pada formasi Talang Akar Atas. Evaluasi berdasarkan analisis geokimia, petrofisika, dan interpretasi seismik. Analisis geokimia menghasilkan bahwa shale formasi target memiliki material organik yang cukup berpotensi dan juga matang. Hidrokarbon yang dihasilkan berupa minyak. Analisis petrofisika dilakukan untuk mendapatkan model TOC dan brittleness index. Pemodelan TOC dilakukan dengan 4 metode yaitu Schmoker, Passey, Multi Regresi Linier, dan Neural Network. Dari keempat metode tersebut,Neural Network yang menghasilkan data paling baik. Korelasi yang didapat pada sumur X-1 adalah 0.96 dan 0.84 untuk sumur X-3. Berdasarkan nilai brittleness index, Sumur X-1 memiliki shale yang bersifat less ductile – less brittle sementara sumur X-2 dan X-3 memiliki shale yang bersifat less brittle. Sumur X-1 memiliki potensi shale hidrokarbon berada pada kedalaman 2054 – 2081 m dengan ketebalan 27 m dengan rentang nilai brittleness 0.3 – 0.34 dan rentang TOC 2.0 – 4.4 wt% serta impedansi akustik 7200-9900 gr/cc*m/s. Sumur X-3 memiliki potensi shale hidrokarbon berada pada kedalaman 1461-1487 dengan ketebalan 26 m dengan rentang TOC 1.8 – 3.94 wt% dan brittleness index berkisar 0.35-0.44, dan impedansi akustik 9197 - 10964 gr/cc*m/s. Shale yang berpotensi menjadi shale hidrokarbon tersebar pada daerah sekitar sumur X-2 dengan nilai brittleness sekitar 0.38-0.4 yang termasuk sifat less brittle dan TOC dengan nilai sekitar 3 wt%.

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The research area is a structure that produce conventional hydrocarbon located in the southeastern part of the South Sumatra Basin and in the northwest part of the Lampung highlands. This study aims to evaluate the shale hydrocarbon potential in the area. Evaluation of shale hydrocarbons was carried out on three wells, X-1, X-2 and X-3 wells with target in the Upper Talang Akar formation. Evaluation based on geochemical analysis, petrophysics, and seismic interpretation. Geochemical analysis produces that the target shale formation has quite potential and mature organic material. The hydrocarbons produced are oil. Petrophysical analysis is performed to obtain the TOC model and brittleness index. TOC modeling is done with 4 methods, namely Schmoker, Passey, Multi Linear Regression, and Neural Network. Based on  the four methods, the Neural Network produces the best data. The correlation obtained in X-1 wells is 0.96 and 0.84 for X-3 wells. Based on the brittleness index value, X-1 wel has a shale that is less ductile - less brittle while X-2 and X-3 wells have less brittle shale. The X-1 well has a hydrocarbon shale potential at a depth of 2054 - 2081 m with a thickness of 27 m with a range of 0.3 - 0.34 brittleness and TOC 2.0 - 4.4 wt% and acoustic impedance 7200-9900 gr / cc * m / s. The X-3 well has shale hydrocarbon potential at a depth of 1461-1487 with a thickness of 26 m with a range of TOC 1.8 - 3.94 wt% and brittleness index ranging from 0.35-0.44, and acoustic impedance 9197 - 10964 gr / cc * m / s. The distribution of shale which has the potential to become shale hydrocarbons is around the X-2 well with the value of brittleness is around 0.38-0.4 (less brittle) and the value of TOC is around  3 wt%.  

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"Analisis potensi shale hidrokarbon dengan pendekatan data geokimia dan interpretasi seismik telah berhasil dilakukan pada lapangan FH, Sub-Cekungan Jambi. Parameter dalam eksplorasi shale hidrokarbon yang mengandung Total Organic Content TOC lebih tinggi dari 1, Indeks Hidrogen HI lebih tinggi dari 100, Vitrinite Reflectance Ro lebih tinggi dari 1,3 untuk dry gas, Net Shale Thickness lebih dari 75, dan kerogen dikelompokkan menjadi tipe I, II atau III. Penelitian ini berlokasi di Sub-Cekungan Jambi, yang terletak di provinsi Jambi, bagian timur pulau Sumatera. Sub-Cekungan Jambi adalah Sub-Cekungan dari Cekungan Sumatera Selatan. Berdasarkan petroleum sistem di wilayah Sub-Basin Jambi, source rock berasal dari bentuk Formasi Lahat berupa Formasi Lacustrine dan Talang Akar berupa terrestrial coal dan coal shale. Penelitian ini bertujuan untuk mengetahui dan menganalisis potensi shale hidrokarbon di Sub-Cekungan Jambi. Formasi Talang Akar menjadi fokus penelitian ini. Talang Akar memiliki sumber batuan yang berkisar dari yang baik sampai yang sangat bagus dan sangat potensial mulai dari 1,5 sampai 8 wt TOC di daerah Sub-Cekungan Jambi. Inversi seismik adalah teknik pembuatan model geologi bawah permukaan dengan menggunakan data seismik sebagai masukan dan data geologi sebagai kontrol. Hasil analisis menunjukkan bahwa nilai TOC berada pada kisaran 0,5 - 1,5 wt dan Ro berada pada kisaran 0,51 - 1,1. Hasil analisi parameter petrofisika menunjukkan nilai porositas di bawah 10 dan saturasi air lebih dari 50. Interpretasi seismic menunjukkan daerah yang memiliki potensi berada pada nilai akustik impedan di atas 7800 m/s g/cc. Berdasarkan peta persebaran akustik impedan, daerah Timur Laut dan Tenggara merupakan daerah dengan potensi shale hidrokarbon yang baik.

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Analysis of the potential of hydrocarbon shale with geochemical data and seismic interpretation has been successfully done in field FH, Jambi Sub Basin. The parameters in the exploration of shale hydrocarbon contains Total Organic Carbon TOC is higher than 1, Index Hydrogen HI is higher than 100, Vitrinite Reflectance Ro is higher than 1.3 for window dry gas, the Net shale Thickness is over 75, and kerogen is classified into type I, II or III. This study are is located in Jambi sub basin, which is situated in the province of Jambi, the eastern part of the Sumatra island. Jambi sub basin is a sub basin of South Sumatra Basin. Based on the petroleum system in the area of Jambi Sub Basin, source rocks derived from the form Lahat Formation lacustrine and Talang Akar Formation in the form of terrestrial coal and coal shale. This study aims to identify and analyze the potential of shale hydrocarbons in the Jambi Sub Basin. Talang Akar Formation is the focus of this study. Talang Akar has a source rock that is ranged from good to excellent and highly potential ranging from 1.5 to 8 wt TOC in Sub Basin area Jambi. Seismic inversion is a technique of making the subsurface geological models using seismic data as an input and geological data as control. Analysis shows that TOC values are in the range of 0.5 ndash 1.5 wt and Ro is in the range of 0.51 ndash 1.1. petrophysic parameter shown that area having porosity less than 10 and water saturation more than 50. Seismic interpretation showing that area interest have acoustic impedance more than 7800 m s g cc. Based on the Acoustic Impedance distribution map, Northeast and Southeast is an area with good shale hydrocarbon potential."

"Isolat bakteri SM 1_7 merupakan mikroorganisme yang diisolasi dari habitat mangrove dan memiliki kemampuan untuk memanfaatkan hidrokarbon sebagai sumber energi. Penelitian sebelumnya menguji kemampuan bakteri SM 1_7 pada konsentrasi hidrokarbon 1 . Potensi kemampuan biodegradasi isolat bakteri SM 1_7 perlu diuji kembali dengan meningkatkan konsentrasi senyawa hidrokarbon. Penelitian ini bertujuan untuk menganalisis kemampuan biodegradasi isolat bakteri SM 1_7 pada konsentrasi minyak diesel 1,5 . Pengukuran pertumbuhan isolat bakteri SM 1_7 dilakukan menggunakan metode Total Plate Count TPC dan analisis degradasi senyawa hidrokarbon menggunakan metode GC/MS. Hasil pengukuran pertumbuhan menunjukkan bahwa isolat SM 1_7 mengalami peningkatan jumlah koloni dari 9,38 x 105 CFU/mL pada jam ke-0 menjadi 9,28 x 108 CFU/mL setelah inkubasi 48 jam. Hasil analisis biodegradasi senyawa hidrokarbon menunjukkan bahwa isolat SM 1_7 mampu mendegradasi beberapa senyawa alkana dengan panjang rantai karbon C12--C23, yaitu Dodecane 49,997 , tridecane 49,603 , tetradecane 13,880 , pentadecane 34,323 , hexadecane 9,247 , heptadecane 33,683 , heneicosane 61,143 , tricosane 51,453 , dan senyawa asam lemak hexadecanoic acid 75,467 dan octadecanoic acid 82,630.

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Bacterial isolate SM 1 7 was isolated from mangrove habitat and has the capability to utilize hydrocarbons as a carbon source. Previous research examined the capability of bacterial isolate SM 1 7 to degrade 1 v v hydrocarbon. The biodegradation potential of hydrocarbons from bacterial isolate SM 1 7 needs to be re examined by increasing the concentration of hydrocarbon. The objective of this research is to analyze the hydrocarbon degrading capabilities of bacteria isolate SM 1 7 in 1,5 v v diesel oil. Growth measurement of SM 1 7 bacterial isolate was performed using Total Plate Count TPC method, and analysis of hydrocarbon degradation was carried out by GC MS.

The growth measurements show that the total number of bacteria increased from 9,38 x 105 CFU mL to 9,28 x 108 CFU mL after 48 hours incubation. Analysis of hydrocarbon compounds showed that bacteria isolate SM 1 7 is capable of degrading alkane hydrocarbon compounds with carbon chain length C12 C23, namely Dodecane 49,997 , tridecane 49,603 , tetradecane 13,880 , pentadecane 34,323 , hexadecane 9,247 , heptadecane 33,683 , heneicosane 61,143 , tricosane 51,453 , and fatty acid compounds hexadecanoic acid 75,467 and octadecanoic acid 82,63."

"[Lapangan X merupakan lapangan mature yang berada di Cekungan Sumatera Tengah. Lapangan ini memiliki struktur antiklin produk dari reverse oblique-slip fault yang membentuk zona patahan di sisi Barat Lapangan X. Zona ini terbukti menghasilkan hidrokarbon ditunjukan oleh sumur produksi X-027, X-153 dan X 154. Sehingga zona patahan ini memiliki potensi untuk di eksplorasi lebih lanjut. Namun, kondisi seismik di zona ini chaotic sehingga sulit untuk menginterpretasikan zona patahan. Penelitian ini akan menggunakan metode geoelectric IVEL dan continuous wavelet transform (CWT) untuk mendapatkan informasi keberadaan hidrokarbon dizona patahan Lapangan X. Geoelectric IVEL (Inversion Vertical Electrical Logging) menggunakan metode vertical sounding schlumberger yang diolah untuk menghasilkan penampang resistivitas medium. Hasil penampang resistivitas medium pada penelitian ini menunjukkan adanya kemiripan nilai resitivitas dengan nilai log resistivitas sumur untuk zona reservoar 350sd dan 550sd (10-20 ohmm). Nilai resistivitas ini terlihat juga di zona patahan yang dijadikan indikator hidrokarbon. Hasil dalam domain kedalaman membantu dalam interpretasi kedalaman reservoar di zona patahan. Analisis continuous wavelet transform (CWT) pada penelitian ini menunjukan amplitudo tinggi pada frekuensi rendah 5-20 Hz dan merupakan indikasi adanya hidrokarbon. Amplitudo tinggi pada frekuensi rendah telihat juga di zona patahan, pada posisi dimana IVEL menunjukan nilai resistivitas sebagai indikator.

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Hidrocarbon X field is a mature field in Central Sumatera Basin. It has anticline structure as a result of reverse oblique-slip fault that produces fault zone in the North side of X Field. It is proved hydrocarbon with the production well X-027, X-153 and X-154. However, it is very difficult to interpret the fault zone with the available seismic data because of the chaotic seismic condition in fault zone. This study uses Ivel Geoelectric method and Continuous Wavelet Transform (CWT) to get hydrocarbon indicator in fault zone. Geoelectric IVEL (Inversion Vertical Electrical Logging) using vertical sounding schlumberger is processed to get medium resistivity section. Medium resistivity section from geoelectrical IVEL at reservoir zone showes similar resistivity value with resistivity log (10-20ohm) for reservoar 350sd and 550sd. This value is showed in fault zone as hydrocarbon indicator. Medium resistivity geoelectrical IVEL is depth domain. It is helpful for interpretation of reservoir depth at fault zone, that is not able to be done by seismic. Continuous wavelet transform (CWT) showes high amplitude at low frequency (5-20Hz) as hydrocarbon indicator. High amplitude at low frequency is showed in fault zone where IVEL showes the hydrocarbon indicator;X field is a mature field in Central Sumatera Basin. It has anticline structure as a

result of reverse oblique-slip fault that produces fault zone in the North side of X Field. It is proved hydrocarbon with the production well X-027, X-153 and X-154. However, it is very difficult to interpret the fault zone with the available seismic data because of the chaotic seismic condition in fault zone. This study uses Ivel Geoelectric method and Continuous Wavelet Transform (CWT) to get hydrocarbon indicator in fault zone. Geoelectric IVEL (Inversion Vertical Electrical Logging) using vertical sounding schlumberger is processed to get medium resistivity section. Medium resistivity section from geoelectrical IVEL at reservoir zone showes similar resistivity value with resistivity log (10-20ohm) for reservoar 350sd and 550sd. This value is showed in fault zone as hydrocarbon indicator. Medium resistivity geoelectrical IVEL is depth domain. It is helpful for interpretation of reservoir depth at fault zone, that is not able to be done by seismic. Continuous wavelet transform (CWT) showes high amplitude at low frequency (5-20Hz) as hydrocarbon indicator. High amplitude at low frequency is showed in fault zone where IVEL showes the hydrocarbon indicator;X field is a mature field in Central Sumatera Basin. It has anticline structure as a result of reverse oblique-slip fault that produces fault zone in the North side of X Field. It is proved hydrocarbon with the production well X-027, X-153 and X-154. However, it is very difficult to interpret the fault zone with the available seismic data because of the chaotic seismic condition in fault zone. This study uses Ivel Geoelectric method and Continuous Wavelet Transform (CWT) to get hydrocarbon indicator in fault zone. Geoelectric IVEL (Inversion Vertical Electrical Logging) using vertical sounding schlumberger is processed to get medium resistivity section. Medium resistivity section from geoelectrical IVEL at reservoir zone showes similar resistivity value with resistivity log (10-20ohm) for reservoar 350sd and 550sd. This value is showed in fault zone as hydrocarbon indicator. Medium resistivity geoelectrical IVEL is depth domain. It is helpful for interpretation of reservoir depth at fault zone, that is not able to be done by seismic. Continuous wavelet transform (CWT) showes high amplitude at low frequency (5-20Hz) as hydrocarbon indicator. High amplitude at low frequency is showed in fault zone where IVEL showes the hydrocarbon indicator.;X field is a mature field in Central Sumatera Basin. It has anticline structure as a

result of reverse oblique-slip fault that produces fault zone in the North side of X Field. It is proved hydrocarbon with the production well X-027, X-153 and X-154. However, it is very difficult to interpret the fault zone with the available seismic because of the chaotic seismic condition in fault zone. This study uses IVEL Geoelectric method and Continuous Wavelet Transform (CWT) to get hydrocarbon indicator in fault zone. Geoelectric IVEL (Inversion Vertical Electrical Logging) using vertical sounding schlumberger is processed to get medium resistivity section. Medium resistivity section from geoelectrical IVEL at reservoir zone showes similar resistivity value with resistivity log (10-20ohm) for reservoar 350sd and 550sd. This value is showed in fault zone as hydrocarbon indicator. Medium resistivity geoelectrical IVEL is depth domain. It is helpful for interpretation of reservoir depth at fault zone, that is not able to be done by seismic. Continuous wavelet transform (CWT) showes high amplitude at low frequency (5-20Hz) as hydrocarbon indicator. High amplitude at low frequency is showed in fault zone where IVEL showes the hydrocarbon indicator, X field is a mature field in Central Sumatera Basin. It has anticline structure as a

result of reverse oblique-slip fault that produces fault zone in the North side of X

Field. It is proved hydrocarbon with the production well X-027, X-153 and X-154.

However, it is very difficult to interpret the fault zone with the available seismic data

because of the chaotic seismic condition in fault zone. This study uses Ivel

Geoelectric method and Continuous Wavelet Transform (CWT) to get hydrocarbon

indicator in fault zone.

Geoelectric IVEL (Inversion Vertical Electrical Logging) using vertical sounding

schlumberger is processed to get medium resistivity section. Medium resistivity

section from geoelectrical IVEL at reservoir zone showes similar resistivity value

with resistivity log (10-20ohm) for reservoar 350sd and 550sd. This value is showed

in fault zone as hydrocarbon indicator. Medium resistivity geoelectrical IVEL is

depth domain. It is helpful for interpretation of reservoir depth at fault zone, that is

not able to be done by seismic. Continuous wavelet transform (CWT) showes high

amplitude at low frequency (5-20Hz) as hydrocarbon indicator. High amplitude at

low frequency is showed in fault zone where IVEL showes the hydrocarbon indicator]"

"[ABSTRAKFormasi Baong bagian bawah bertanggung jawab sebagai batuan indukyang mengisi reservoar batupasir pada lapangan minyak dan gas di bagiantenggara Cekungan Sumatera Utara. Penelitian ini mengungkapkan data dan faktadari laboratorium, pengeboran, wireline well log dan seismik melalui studi analisapetrofisika, geokimia, geomekanika dan geofisika Formasi Baong bagian bawah.Pemahaman tentang geokimia, mineralogi dan geomekanika serpih sangat pentinguntuk memahami bagaimana reservoir serpih memiliki potensi untuk cadangandan produksi ketika dilakukan stimulasi. Analisis laboratorium geokimiadigunakan untuk menentukan kekayaan, kematangan dan kerogen tipe. Penelitianini mengklasifikasikan serpih berdasarkan kekayaan organik, kematangan, jenis,kekuatan serpih, kerapuhan serpih dan kandungan clay. Formasi Baong bagianbawah yang menjadi target pada studi ini terletak pada kedalaman 1778-2428 m(TVD), memiliki material organik yang kaya dengan TOC berkisar antara 1,88-3,85% wt, tingkat kematangan 12% sudah matang dan 88% belum matang, sertamenghasilkan 20% kerogen tipe III dan 80% kerogen tipe II/III sehingga dapatdijadikan sebagai batuan induk yang berpotensi menghasilkan gas dangas/minyak. Rigiditas Formasi Baong bagian bawah sangat sangat brittle denganmemiliki rata ? rata kandungan mineral kuarsa 33,7% dan mineral brittle sepertikalsit 8,8%, dolomit 1,8% dan siderit 0,9%, serta brittle 80% dan less brittle 20%,sehingga dapat dilakukan hyhraulic fracturing dengan baik. Nilai impedansiserpih Formasi Baong bagian bawah berkisar antara 20203 ? 24615 ((ft/s)*(g/cc)).

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ABSTRACTThe Lower Baong Formation is responsible for source rock filled upsandstones reservoir in the oil and gas field in the southeastern part of NorthSumatra Basin. This study reveals the data and facts from the laboratory, drilling,wireline well logs and seismic through the analysis study of petrophysics,geochemistry, geomechanics and geophysics of Lower Baong Formation. Anunderstanding of shale geochemistry, mineralogy and geomechanics is veryimportant to understand how the shale reservoir has the potential to reserve andproduce when carried out stimulation. Geochemical laboratory analysis is used todetermine the richness, maturity and kerogen type. This study classify shale basedon organic richness, maturity, type, shale strengthness, shale brittleness and claycontent. The Lower Baong Formation being targeted in this study lies at a depthof 1778-2428 m (TVD), has a rich organic material with TOC ranging from 1.88to 3.85 wt%, the maturity level of 12% is mature and immature 88%, and generate20% kerogen type III and 80% kerogen type II / III so it can be used as a sourcerock potential to produce gas and gas / oil. Lower Baong Formation rigidity arevery brittle by having the averages 33.7% quartz mineral content and brittleminerals such as 8.8% calcite, 1.8% dolomite and siderite 0.9%, and brittle 80%and less brittle 20%, so it can be done hyhraulic fracturing very well. Sahle valuesof Lower Baong Formation bottom ranges from 20203-24615 ((ft/s)*(g / cc))., The Lower Baong Formation is responsible for source rock filled upsandstones reservoir in the oil and gas field in the southeastern part of NorthSumatra Basin. This study reveals the data and facts from the laboratory, drilling,wireline well logs and seismic through the analysis study of petrophysics,geochemistry, geomechanics and geophysics of Lower Baong Formation. Anunderstanding of shale geochemistry, mineralogy and geomechanics is veryimportant to understand how the shale reservoir has the potential to reserve andproduce when carried out stimulation. Geochemical laboratory analysis is used todetermine the richness, maturity and kerogen type. This study classify shale basedon organic richness, maturity, type, shale strengthness, shale brittleness and claycontent. The Lower Baong Formation being targeted in this study lies at a depthof 1778-2428 m (TVD), has a rich organic material with TOC ranging from 1.88to 3.85 wt%, the maturity level of 12% is mature and immature 88%, and generate20% kerogen type III and 80% kerogen type II / III so it can be used as a sourcerock potential to produce gas and gas / oil. Lower Baong Formation rigidity arevery brittle by having the averages 33.7% quartz mineral content and brittleminerals such as 8.8% calcite, 1.8% dolomite and siderite 0.9%, and brittle 80%and less brittle 20%, so it can be done hyhraulic fracturing very well. Sahle valuesof Lower Baong Formation bottom ranges from 20203-24615 ((ft/s)*(g / cc)).]"

"Lapangan X merupakan lapangan produksi minyak dan gas bumi yang terletak pada cekungan Sumatera Tengah Daerah. Zona target hidrokarbon berada pada formasi Bekasap. Formasi Bekasap merupakan salah satu batuan reservoar yang utama di cekungan Sumatera Tengah. Penelitian ini telah dilakukan analisis inversi seismik dan analisis atribut seismik untuk mengidentifikasi persebaran reservoar dan dapat menganalisis keberadaan hidrokarbon pada daerah penelitian. Inversi seismik dan atribut seismik dilakukan dengan menggunakan data seismik 3D Post Stack dan data log dari 3 sumur. Data tersebut dianalisa dengan menggunakan metode inversi dan ekstraksi atribut.Perpaduan antara atribut seismik dan inversi seismik efektif untuk dijadikan sebagai landasan dalam mengambil tindakan terhadap reservoar. Dari perpaduan tersebut berupa peta persebaran reservoar batu pasir berdasarkan analisa inversi model based dan analisa atribut seismik menggunakan atribut Root Mean Square (RMS), Atribut Envelope dan Instantaneous Frequency. Berdasarkan hasil pengolahan dan interpretasi dari penelitian lapangan X, maka didapatkan nilai impedansi akustik yang tinggi sebesar 6200-7200ft/s yang intepretasikan sebagai batu pasir, Dimana pada nilai AI yang tinggi menunjukkan sand dan impedansi akustik rendah sebesar 5600-6200 ft/s yang diintepretasikan sebagai batu lempung. Dimana pada nilai AI yang rendah menunjukan shale.

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Field X is an oil and gas production field located in the Central Sumatra Regional Basin. The hydrocarbon target zone is in the Bekasap formation. Bekasap Formation is one of the main reservoir rocks in the Central Sumatra basin. This research has conducted seismic inversion analysis and seismic attribute analysis to identify reservoir distribution and can analyze the presence of hydrocarbons in the study area. Seismic inversion and seismic attributes were carried out using 3D Post Stack seismic data and log data from 3 wells. The data is analyzed using inversion methods and attribute extraction.

The combination of seismic attributes and effective seismic inversion is used as the basis for taking action on the reservoir. From this combination in the form of sandstone reservoir distribution map based on model based inversion analysis and seismic attribute analysis using the Root Mean Square (RMS) attribute, Envelope Attribute and Instantaneous Frequency attribute. Based on the results of processing and interpretation of X field research, the high acoustic impedance value of 6200-7200ft/s is interpreted as sandstone, where at high AI values ​​it shows sand and low acoustic impedance of 5600-6200 ft/s interpreted as clay stones. Where the low AI value shows shale.

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"ABSTRAKKualitas data seismik yang diakuisisi di atas endapan vulkanik di wilayah Banjar, Jawa Barat, relatif rendah. Upaya lain untuk mendapatkan model bawah permukaan adalah menggunakan metode MT dalam bentuk distribusi nilai resistivitas. Pemodelan tersebut didukung oleh peta geologi serta data tambahan berupa informasi contoh batuan pada studi sebelumnya. Sehingga, penelitian ini dapat digunakan untuk eksplorasi hidrokarbon pada wilayah observasi di kota Banjar-Pangandaran, provinsi Jawa Barat. Data MT pada penelitian ini terdiri dari tiga lintasan dengan total stasiun perekaman data sebanyak 179 titik. Pada line-1 yang terdiri dari 47 titik data merupakan cross-section pada lintasan lainnya, memperlihatkan suatu bentuk endapan sedimen yang ditandai oleh nilai resistivitas rendah dan semakin meningkat ke bawah. Pada line-8 yang terdiri dari 62 titik data, merupakan lintasan yang sejajar dengan line-4 yang terdiri dari 70 titik data. Kesejajaran antara kedua lintasan itu memperlihatkan pemodelan sebaran resistivitas di kedua lintasan tersebut tidak jauh berbeda. Pada koreksi crosspower di beberapa stasiun perekaman memiliki hasil trend kurva resistivitas yang berbeda sesuai dengan kondisi geologi di wilayah tersebut. Hasil inversi pada line-4 dan line-8 menunjukkan beberapa patahan-patahan menunjam kebawah yang disebut sebagai patahan Gabon dengan beberapa formasi-formasi yang berpotensi sebagai reservoir. Formasi-formasi tersebut diantaranya formasi Jampang dengan visual porositas 10-20 %, formasi Kalipucang dengan visual porositas 10-15 %, formasi Pamutuan dengan visual porositas 17 % dan formasi Bentang dengan visual porositas 13-26 %. Informasi data visual porositas pada contoh batuan ini digunakan untuk memodelkan potensi reservoar di bawah wilayah penelitian serta didukung oleh peta geologi untuk menginterpretasikan kondisi-kondisi geologi yang terjadi di setiap lintasan

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ABSTRACTThe quality of the seismic data in volcanic deposits at Banjar, West Java, is relatively low. Another attempt to get beneath the surface of the model is using the MT method in the form of distribution of resistivity values. The modeling is supported by geological maps as well as additional data in the form of information rock samples in previous studies. Thus, this study could be used for exploration of hydrocarbons in the observation area at Banjar-Pangandaran, West Java province. In this study, the MT data consists of three lines with total station data recording is 179 points. In the line-1 consists of 47 data points that is cross-section on the other line, showing sediments formation that have characterized by low resistivity values and the deeper formation show the increased of resistivity. In the line-8 consist of 62 data points, a trajectory parallel to the line-4 consist of 70 data points. The parallels trajectory modeling shows not really different resistivity value distribution in both these line. The crosspower correction in several recording stations have curve resistivity trend results according to different geological conditions at that region. Inversion results on line 4 and line 8 shows several down subduction faults, called as Gabon fault with some formations that have the potential as a reservoir. These formations include Jampang formation with visual porosity of 10-20%, Kalipucang formation with visual porosity of 10-15%, Pamutuan formation with 17% visual porosity and Bentang formations with 13-26% visual porosity. Information of visual data porosity rock samples is used to potential reservoir modelling beneath the study area and supported by geological maps to interpret the geological conditions in each line"

"Formasi Talang Akar yang saat ini merupakan reservoir utama penghasil hidrokarbon yaitu sebanyak 75% akumulasi hidrokarbon dari Cekungan Sumatra Selatan dihasilkan oleh Formasi Talang Akar. Untuk memaksimalkan serta menemukan zona reservoir baru yang dapat dijadikan zona potensi akumulasi hidrokarbon, maka penelitian ini dilakukan yaitu dengan menentukan atau mengidentifikasi zona potensi reservoir hidrokarbon pada Formasi Talang Akar. Penelitian ini dilakukan dengan menggunakan beberapa data yaitu data log, Routine Core Analysis (RCA), data XRD, data mudlog, dan data biostratigrafi dengan pengolahan data yang dilakukan yaitu secara kualitatif dan secara kuantitatif. Berdasarkan pengolahan data secara kualitatif dapat diamati litologi dari seluruh sumur yaitu berupa batupasir dengan selingan serpih dan terdapat beberapa endapan tipis batubara. Penentuan litologi ini dapat dilihat dari pembacaan log dan dengan validasi data mudlog. Berdasarkan analisis kuantitatif atau petrofisika, hasil perhitungan parameter petrofisika pada sumur penelitian didapatkan rata-rata pada zona hidrokarbon dengan Volume Shale (Vshale): 0,195 s.d. 0,298 V/V, Porositas Efektif (PHIE): 19% s.d. 34%, Saturasi Air (Sw): 0,371 s.d. 0,616 V/V. Nilai cut off yang digunakan untuk menentukan ketebalan zona hidrokarbon (net pay) yaitu Vshale ≤ 0.4 V/V, PHIE ≥ 12%, dan Sw ≤ 0.7 V/V. Ketebalan zona hidrokarbon dari masing-masing sumur yaitu X1: 18,5 ft, X2: 13 ft, X3: 4,7 ft, X4: 63 ft, dan X5: 1,7 ft.

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The Talang Akar Formation is currently the main hydrocarbon-producing reservoir, 75% of the hydrocarbon accumulation of the South Sumatra Basin is produced by the Talang Akar Formation. To maximize and find new reservoir zones that can be used as potential hydrocarbon accumulation zones, this research was conducted by determining or identifying potential hydrocarbon reservoir zones in the Talang Akar Formation. This research was conducted using several data, namely log data, Routine Core Analysis (RCA), XRD data, mudlog data, and biostratigraphic data with data processing carried out qualitatively and quantitatively. Based on qualitative data processing, it can be observed that the lithology of all wells is sandstone with shale interludes and there are several thin deposits of coal. This lithology determination can be seen from log readings and by validating mudlog data. Based on quantitative or petrophysical analysis, the results of the calculation of petrophysical parameters in the research wells obtained an average in the hydrocarbon zone with Volume Shale (Vshale): 0.195 to 0.298 V/V, Effective Porosity (PHIE): 19% to 34%, Water Saturation (Sw): 0.371 to 0.616 V/V. The cut off values used to determine the thickness of the hydrocarbon zone (net pay) are Vshale ≤ 0.4 V/V, PHIE ≥ 12%, and Sw ≤ 0.7 V/V. The hydrocarbon zone thickness of each well is X1: 18.5 ft, X2: 13 ft, X3: 4.7 ft, X4: 63 ft, and X5: 1.7 ft."

"Penelitian dilakukan pada reservoir batupasir di Lapangan "Deju" Formasi Talang Akar, Sub Cekungan Ciputat, Jawa Barat Utara. Struktur geologi yang berkembang di daerah penelitian adalah setengah graben dengan fasies pengendapan yang berkembang dari endapan fluvio-delta hingga endapan laut dangkal di puncak formasi Talang Akar. Karakterisasi waduk di lapangan sangat penting terutama dalam menentukan zona prospek waduk yang akan dikembangkan. Oleh karena itu, identifikasi sebaran litologi batuan reservoir dilakukan dengan menggunakan metode inversi seismik post stack dan sifat fisik reservoir menggunakan analisis petrofisika dapat memudahkan interpreter dalam mengkarakterisasi suatu reservoir. Metodologi penelitian meliputi pengolahan data seismik dan wireline logging, interpretasi horizon dan sesar, pembuatan peta struktur waktu, inversi seismik, dan analisis parameter petrofisika. Dengan metode inversi impedansi akustik seismik didapatkan bahwa trend sebaran reservoir batupasir hanya terkonsentrasi disekitar cekungan dengan range nilai impedansi akustik berkisar antara (8600 - 11000) (m / s) * (g / cc). Dalam perhitungan petrofisika diketahui bahwa sumur LL1 dan LL3 memiliki prospek hidrokarbon yang relatif baik, sedangkan sumur LL4 merupakan sumur prospek non hidrokarbon (dry hole).

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The research was conducted at a sandstone reservoir in the "Deju" Field of the Talang Akar Formation, Ciputat Sub Basin, North West Java. The geological structure that develops in the study area is a half graben with depositional facies that develops from fluvio-deltaic deposits to shallow marine deposits at the top of the Talang Akar formation. Reservoir characterization in the field is very important, especially in determining the zone of the reservoir prospect to be developed. Therefore, identification of reservoir rock lithology distribution is carried out using post stack seismic inversion method and reservoir physical properties using petrophysical analysis can facilitate interpreters in characterizing a reservoir. The research methodology includes seismic data processing and wireline logging, interpretation of horizons and faults, creation of time structure maps, seismic inversion, and analysis of petrophysical parameters. With the seismic acoustic impedance inversion method, it is found that the distribution trend of the sandstone reservoir is only concentrated around the basin with a range of acoustic impedance values ​​ranging from (8600 - 11000) (m / s) * (g / cc). In petrophysical calculations, it is known that LL1 and LL3 wells have relatively good hydrocarbon prospects, while LL4 wells are non-hydrocarbon prospects (dry hole)."