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Abstrak :
[ABSTRAK
Telah dilakukan penelitian untuk mendeteksi sebuah patahan dengan metode Ant-tracking, penelitian ini dilakukan karena identifikasi sebuah patahan bukanlah perkara yang mudah. Pada penelitian ini data yang diolah dan dimodelkan adalah data dari lapangan Gulf of Mexico. Dipilihnya metode attribut ant-tracking karena telah terbukti dapat memudahkan dalam menganalisa sebuah patahan. Sebelum proses Ant-tracking dilakukan terlebih dahulu dilakukan proses Seismic Conditioning dengan Structural Smoothing agar diperoleh data yang baik serta untuk mereduksi noise-noise yang tidak diinginkan. Hasil penelitian menunjukkan segmentasi patahan yaitu patahan mayor sejumlah dua buah serta delapan patahan minor. Patahan ini dapat terjadi juga terkait dengan struktur pada lapangan Gulf of Mexico yang merupakan endapan dari kumpulan lapisan terrigenous miring yang menebal ke arah teluk. Struktur yang diciptakan oleh sejarah panjang tektonik gravitasi ( sesar tumbuh ) yang saling berpengaruh terhadap endapan garam dan batulumpur overpressured. Perkembangan luas dari endapan - endapan overpressured meningkatkan produktivitas dari potensi reservoir.

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ABSTRACT
The study has been to detect a fault with ant-tracking method. This research conducted to identify a fault is not an easy matter. This research data is processed and modeled from the Gulf of Mexico field data. Ant-tracking attribute method was chosen because it has proven to be easier to analyze a fault. Before the ant-tracking implemented, seismic conditioning process with structural smoothing applied first, in order to obtain good data as well as to reduce unwanted noises. The reseach show fault segmentation results, two major faults and eight minor faults. This fault can also occur related to the subsurface structure Gulf of Mexico which is a collection of layers of terrigenous sediment thickened tilted the bay. Structure created by a long history of tectonic gravity (growth faults) that affect the salt domes and the overpressured shale. Comprehensive development of overpressured sediments increases the productivity of the reservoir potential, The study has been to detect a fault with ant-tracking method. This research conducted to identify a fault is not an easy matter. This research data is processed and modeled from the Gulf of Mexico field data. Ant-tracking attribute method was chosen because it has proven to be easier to analyze a fault. Before the ant-tracking implemented, seismic conditioning process with structural smoothing applied first, in order to obtain good data as well as to reduce unwanted noises. The reseach show fault segmentation results, two major faults and eight minor faults. This fault can also occur related to the subsurface structure Gulf of Mexico which is a collection of layers of terrigenous sediment thickened tilted the bay. Structure created by a long history of tectonic gravity (growth faults) that affect the salt domes and the overpressured shale. Comprehensive development of overpressured sediments increases the productivity of the reservoir potential]

Abstrak :
Tahap eksplorasi pada pengembangan lapangan geotermal merupakan tahap yang paling penting untuk memahami sistim geotermal. Pemahaman sistim geotermal yang baik dapat meminimalkan risiko kegagalan pada saat pemboran sumur produksi dilakukan. Eksplorasi geofisika yang digunakan penelitian ini adalah metode gravitasi. Metode gravitasi pada prinsipnya mengidentifikasi variasi densitas pada bawah permukaan sehingga dapat digunakan untuk delineasi struktur bawah permukaan. Kombinasi antara metode upward continuation dan second vertical derivative dilakukan untuk mengkarakterisasi struktur geologi baik arah kemiringan, perkiraan kedalaman, perkiraan sudut kemiringan dan jenis struktur. Hasil ML-SVD menunjukan bahwa karakteristik struktur geologi daerah penelitian memiliki dip >60°, terdapat patahan normal maupun reverse dan mampu mengidentifikasi struktur pada kedalaman tertentu. Terdapat pola struktur melingkar yang didugga berasosiasi dengan kaldera Pangkalan. Pemodelan data gravitasi 2D dilakukan untuk mengetahui sebaran densitas bawah permukaan. Pemodelan densitas menunjukan bahwa densitas lapisan clay cap sebesar 2,28 g/cc dan lapisan reservoir sebesar 2,55 g/cc. Analisa geokimia gas menunjukan temperatur rata-rata reservoir sebesar 253 ºC. Zona upflow daerah penelitian berada didalam struktur melingkar. ......Exploration stage on geothermal development are the most important stage to understand the geothermal system of research area. A good understanding of geothermal system can minimize the risk of failure in drilling stage. Geophysical exploration method in this research is gravity method. The gravity method in principle identifies density variations below the surface so that it can be used to delineate subsurface structures. The combination of the upward continuation and second vertical derivative methods is carried out to characterize the geological structure both the slope direction, depth estimation, dip estimation and type of structure. ML-SVD result show that fault structure at research area have value of dip > 60º, fault configuration and depth of fault under rock layers. Fault with circular pattern have been found that expected associate with Pangkalan caldera. 2D density model is done to determinate the distribution of subsurvace density. 2D density model show that clay cap have density value 2.28 g/cc and reservoir 2.55 g/cc. Gas geochemistry analysis show the temperatur at reservoir 253 ºC. The upflow zone estimated inside the circular structure of research area.

Abstrak :
Metode gravitasi merupakan salah satu metode geofisika yang sudah umum digunakan dalam eksplorasi sistem panas bumi. Parameter yang terdeteksi berupa variasi nilai gravitasi yang menggambarkan distribusi densitas bawah permukaan. Dalam sistem panas bumi, batuan reservoir dapat dipetakan dengan metode gravitasi dikarenakan batuan reservoir memiliki densitas yang lebih rendah dibandingkan sekitarnya, sehingga menimbulkan anomali kontras densitas. Selain reservoir, struktur bawah permukaan juga akan teridentifikasi melalui peta residual, yang juga dikorelasikan dengan analisis derivatif berupa First Horizontal Derivative FHD , dan Second Vertical Derivative SVD. Melalui identifikasi patahan, zona recharge, zona discharge, serta daerah upflow dan outflow dapat dipetakan dengan lebih baik untuk merancang model konseptual sistem panas bumi. Kemudian dalam penelitian ini, sistem panas bumi akan dibuat model 3D inversi untuk penggambaran yang lebih jelas.

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Gravity is a common geophysical method to be used in geothermal exploration. The detected parameter is the variation of gravity value, which represents the distribution of subsurface density. In geothermal system, we can detect reservoir rock with gravity method because the reservoir rock has a lower density rather than its surrounding which makes a contrast anomaly. For subsurface structures, the author will analyze it with derivative method FHD First Horizontal Derivative and SVD Second Vertical Derivative . Through subsurface structure identification, we can delineate the recharge and discharge area, together with uplow and outflow zone to design the geothermal conceptual model. Last but not least, the author will make a 3d inversion model for a better understanding.

Abstrak :
Dalam eksplorasi geotermal, perlu dilakukan pencarian daerah interest sehingga tidak terjadi kesalahan pemboran. Pencarian daerah interest ini dilakukan di wilayah yang cukup besar sehingga diperlukan metode geofisika yang ekonomis namun cukup baik dalam menggambarkan kondisi bawah permukaan. Salah satu metode tersebut adalah metode gravitasi. Penelitian ini dilakukan untuk mencari dan memodelkan sistem geotermal dengan studi kasus di Gunung Pancar dengan metode gravitasi yang dianalisis dengan metode SVD, HG, dan pemodelan inversi 3D. Dari analisis SVD dan HG didapatkan lokasi dan jenis patahan. Dari hasil inversi 3D didapat gambaran bawah permukaan berdasarkan nilai densitas. Hasil analisis tadi akan dibantu data pendukung dari penelitian sebelumnya berupa data AMT dan geologi untuk membuat model forward 2D yang menggambarkan kemungkinan kondisi geologi bawah permukan sehingga diketahui gambaran heat source serta kondisi patahan. Hasil akhir penelitian ini berupa model konseptual sistem geotermal Gunung Pancar yang menjelaskan sistem geotermal di Gunung Pancar dan kemungkinan aliran fluidanya. Berdasarkan analisis SVD dan HG didapat kemungkinan adanya enam patahan. Hasil pemodelan dengan lintasan arah NE-SW yang melintasi puncak pancar dan lokasi manifestasi hotspring mendapatkan kemungkinan lokasi heat source berada di kedalaman 1800 m dan adanya hotsrping yang diduga berasosiasi dengan letak patahan dan merupakan bagian dari aliran outflow .

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ABSTRACT
In geothermal exploration, it is necessary to search for interest areas so that no drilling errors occur. The search for this area of interest is carried out in a large enough area so that an economical geophysical method is needed but is quite good at describing subsurface conditions. One such method is the gravity method. This research was conducted to find and model geothermal systems with a case study in Gunung Pancar using the gravity method analyzed by the SVD method, HG, and 3D inversion modeling. From the analysis of SVD and HG, the location and type of fault were obtained. From the results of 3D inversion, the subsurface picture is obtained based on the density value. The results of the analysis will be supported by supporting data from previous research in the form of AMT data and geology to make a 2D forward model that describes the possible geological conditions under the surface so that the heat source description and fault conditions are known. The final result of this research is the Gunung Pancar geothermal system conceptual model which explains the geothermal system in Gunung Pancar and the possibility of its fluid flow. Based on the analysis of SVD and HG, it is possible to have six faults. The modeling results with the NE-SW direction traversing the Pancar peak and hotspring manifestation location get the possibility that the heat source location is at 1800 m depth and the presence of hotspring is suspected to be associated with the fault location and is part of the outflow flow.

Abstrak :
Sesar Sumatera merupakan salah satu sesar aktif di Pulau Sumatera yang terbagi menjadi beberapa segmen salah satunya segmen Sianok. Segmen Sianok memiliki nilai sliprate 14mm/tahun dan gempa terbesar pada segmen ini yaitu pada 4 Agustus 1926 dengan M 7. Metode gravitasi digunakan karena dapat memetakan kondisi bawah permukaan bumi secara lateral sehingga dapat mengidentifikasi struktur geologi di bawah permukaan. Penelitian ini bertujuan untuk mengkarakterisasi sesar Sumatera Segmen Sianok dan sekitarnya, dan mengestimasi potensi kebencanaan sesmik berbasis data gravitasi satelit ggmplus yang disediakan oleh Curtin University. Dengan menggunakan FHD dan SVD data gravitasi maka dapat diidentifikasi keberadaan, posisi dan jenis sesarnya. Metode MS-SVD merupakan metode dimana terdapat data SVD pada beberapa ketinggian berbeda. Hal ini didapatkan melalui kontinuasi keatas kemudian ketinggian kontinuasi dikonversi menjadi kedalaman sehingga dapat diketahui nilai sudut dip dan arah dip sesar. Dilakukan juga 2D forward modelling untuk melihat model lapisan bawah permukaan dengan menggunakan anomaly residual dan data geologi. Hasilnya terdapat sesar mendatar menganan dengan strike berarah Barat Laut-Tenggara yang memiliki dip-slip dengan nilai sudut dip > 70° ke arah Timur Laut dan di sekitar Segmen Sianok terdapat 3 sesar naik dan 4 sesar normal dengan dip > 51° dan semua sesar tersebut memiliki strike Barat Laut-Tenggara. Dari hasil forward model 2D Bukittinggi terdapat keberadaan sedimen tebal < 1000 m dan kontras densitas sebesar 0,44 gr/cc dan forward model 2D Padang Panjang terdapat sedimen dengan tebal < 100 m dan kontras densitas sebesar 0,3 gr/cc. Sedimen tebal dan kontras densitas merupakan salah Dua parameter potensi kebencanaan sesimik. ......The Sumatran fault is one of the active faults on the island of Sumatra which is divided into several segments, one of which is the Sianok segment. The Sianok segment has a sliprate of 14mm/year and the largest earthquake in this segment was on August 4, 1926 with M 7. The gravity method is used because it can determine the subsurface conditions of the earth laterally so that it can find geological structures below the surface. This study aims to characterize the Sumatran fault in the Sianok segment and its surroundings, and to estimate the potential for a seismic disaster based on gravity data from the ggmplus satellite provided by Curtin University. By using FHD and SVD gravity data, it is possible to identify the presence, position and type of fault. The MS-SVD method is a method where there are SVD data at several different heights. This is obtained through continuity and then the height of the continuity is converted into depth so that the value of the slope angle and the direction of the fault can be known. Also perform 2D forward modeling to see the subsurface model using residual anomalies and geological data. The result is a right horizontal fault with a strike trending Northwest-Southeast which has a dip-slip with a slope angle of > 70 to the Northeast and its surroundings. The Sianok segment has 3 upward faults and 4 normal faults with a dip > 51° and all of these faults have a strike Northwest-Southeast. From the results of the forward 2D Bukittinggi model, there is a sediment thickness of <1000 m and a density contrast of 0.44 gr/cc and the forward 2D model of Padang Panjang has sediment with a thickness of <100 m and a density contrast of 0.3 gr/cc. Sediment thickness and density contrast are two parameters for seismic disaster. 

Abstrak :
Suatu kajian tentang kemungkinan adanya struktur patahan dengan menggunakan data gravitasi telah dilakukan. Parameter struktur patahan dua dimensi dengan bidang permukaan horizontal dapat ditentukan secara langsung dengan menggunakan Metoda Interpretasi Langsung Struktur Patahan Dua Dimensi dimana Metoda Kontinuasi Keatas sangat dominan berperan. Metoda ini telah diterapkan pads data anomaly Bouguer daerah Sumatra Utara di sekitar Danau Toba yang meliputi wilayah 1° - 4° Lintang Utara dan 97° - 100° Bujur Timur. Dari lima buah profil yang dibuat memotong daerah penelitian, diperoleh hasil tiga bush patahanlsesar jenis gravity (normal fault) dengan kedalaman kurang dari lima kilometer, ketebalan sekitar satu kilometer dan kontras rapat massa berkisar 0.2 gr/cc.

Abstrak :
Prospek hidrokarbon pada penelitian ini berada di Indonesia Timur dengan struktur geologi kompleks. Untuk dapat mengeksplorasi keseluruhan area penelitian yang luas membutuhkan waktu dan biaya yang mahal. Salah satu metode geofisika yang paling umum dilakukan dalam eksplorasi pendahuluan adalah metode gravitasi untuk skala regional dan dilanjut dengan data seismik pada skala lokal. Dalam penelitian ini akan menggunakan data gravitasi satelit yang tersedia secara open source dengan keunggulan biaya murah dan dapat mencakup wilayah yang luas. Hasil metode gravitasi berupa anomali gravitasi residual dapat mengidentifikasi potensi cekungan. Pulau Masela sebagai target penelitian miliki anomali gravitasi tinggi yang seharusnya teridentifikasi sebagai cekungan dengan anomali gravitasi rendah. Ketidakmunculan anomali gravitasi rendah di Pulau Masela disebabkan ketidakmampuan resolusi gravitasi satelit karena wilayah target yang kecil. Namun secara struktural gravitasi satelit dapat mengidentifikasi patahan dengan proses filter anomali gravitasi residual berupa first horizontal derivative (FHD) dan second vertical derivative (SVD) karena resolusi strukturnya regional. Pada wilayah Masela terdapat patahan normal memanjang berarah NW-SE pada peta second vertical derivative dan dikonfirmasi dengan data seismik. Berdasarkan anomali gravitasi residual ditemukan sembilan indikasi cekungan yang dua diantaranya sudah proven. Selanjutnya integrasi metode gravitasi dan seismik dilakukan dengan forward modelling untuk mengidentifikasi struktur perangkap hidrokarbon. Berdasarkan forward modelling ditemukan batuan induk di lapisan Triassic dengan densitas 2.67 gr/cc, batuan reservoir di lapisan Jurassic dengan densitas 2.67 gr/cc, dan batuan penudung di lapisan Cretaceous dengan densitas 2.45 gr/cc. ......The hydrocarbon prospect in this research is in Eastern Indonesia with a complex geological structure. To be able to explore the entire large research area requires expensive time and costs. One of the most common geophysical methods used in preliminary exploration is the gravity method on a regional scale and followed by seismic data on a local scale. This research will use satellite gravity data which is available open source with the advantage of low cost and can cover a wide area. The results of the gravity method in the form of residual gravity anomalies can identify potential basins. Masela Island as a research target has a high gravity anomaly which should be identified as a basin with a low gravity anomaly. The absence of low gravity anomalies on Masela Island causes promise in satellite gravity resolution due to the small target area. However, structurally, satellite gravity can identify faults using the residual gravity anomaly filter process in the form of first horizontal derivative (FHD) and second vertical derivative (SVD) because the structural resolution is regional. In the Masela area there is an elongated normal fault trending NW-SE on the second vertical derivative map and confirmed with seismic data. Based on the remaining gravity anomalies, nine indications of basins were found, two of which have been proven. Next, the gravity and seismic integration method is carried out using forward modeling to identify hydrocarbon trap structures. Based on forward modeling, the source rock was found in the Triassic layer with a density of 2.67 gr/cc, the reservoir rock in the Jurassic layer with a density of 2.67 gr/cc, and the cap rock in the Cretaceous layer with a density of 2.45 gr/cc.

Abstrak :
Kepulauan Tanimbar yang berada dalam posisi kunci di dalam Busur Banda, memperlihatkan susunan struktur geologi yang rumit dan masih belum sepenuhnya dijelaskan. Busur Banda adalah salah satu wilayah geologi yang paling kompleks dan dipenuhi kontroversi di planet ini. Salah satu struktur geologi kompleks yang terdapat di Kepulauan Tanimbar adalah struktur patahan. Dalam penelitian ini, metode gravitasi dan seismik diintegrasikan untuk mengidentifikasi dan mengetahui jenis patahan. Dengan memanfaatkan data gravitasi berupa anomali gravitasi, first horizontal derivative (FHD), dan second vertical derivative (SVD), dapat ditentukan distribusi dari lintasan patahan. Selain menentukan distribusi dari lintasan patahan, nilai SVD juga digunakan untuk menentukan jenis dari patahan dengan cara membandingkan nilai mutlak maksimum dan minimum SVD. Beberapa jenis patahan yang telah diidentifikasi menggunakan nilai SVD kemudian diverifikasi dengan data penampang seismik 2D. Dengan metode gravitasi, ditemukan 25 lintasan patahan dimana 15 lintasan memiliki jenis patahan normal dan 10 lintasan memiliki jenis patahan naik. Dari 25 lintasan patahan, 5 lintasan patahan diverifikasi dengan metode seismik. Metode seismik berhasil memverifikasi metode gravitasi dalam menentukan jenis patahan. Keberadaan dan jenis patahan yang ditentukan oleh perbandingan antara nilai mutlak minimum dan maksimum SVD pada 5 lintasan patahan dapat diverifikasi oleh penampang seismik 2D. Namun, diperlukan penelitian lebih lanjut untuk mengetahui efektivitas penentuan jenis patahan dengan menggunakan perbandingan nilai SVD. ......The Tanimbar Islands, situated at a pivotal position within the Banda Arc, exhibit a complex geological structure that has not been fully elucidated. The Banda Arc is one of the most complex and controversial geological areas on this planet. One of the complex geological structures found in the Tanimbar Islands is the fault structure.. In this study, gravity and seismic methods are integrated to identify and understand the type of faults. By utilizing gravity data such as gravity anomalies, First Horizontal Derivative (FHD), and Second Vertical Derivative (SVD), the distribution of fault traces can be determined. In addition to determining the distribution of fault traces, the SVD values are also used to determine the type of faults by comparing the absolute maximum and minimum SVD values. Several types of faults that have been identified using SVD values are then verified with 2D seismic cross-section data. Using gravity methods, 25 fault traces were found, where 15 traces have normal faults and 10 traces have reverse faults. Of the 25 fault traces, 5 fault traces were verified with seismic methods. Seismic methods successfully verified the gravity methods in determining the type of faults. The presence and type of faults determined by the comparison between the absolute minimum and maximum SVD values on the 5 fault traces can be verified by 2D seismic cross-sections. However, further research is needed to understand the effectiveness of determining the type of faults using the comparison of SVD values.

Abstrak :
[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 di zona 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. ......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]

Abstrak :
ABSTRAK
Analisis sekatan patahan untuk menentukan koneksi antar kompaartemen telah dilakukan pada lapangan Anin Cekungan Sumatra Selatan. Secara umum patahan pada lapangan ini membentuk komparetemen-kompartemen baik yang tersekat maupun yang terbuka. Sifat penyekat dari patahan ditentukan dengan analisa sekatan patahan, yang mana merupakan sebuah metode yang penting dalam mengevaluasi jebakan dan jalur migrasi hidrokarbon. Tujuan dari studi ini untuk menganalisa dan mengkarakterisasi sifat dari patahan dan hubungan antar kompartemen reservoir. Pada kebanyakan kasus, pergerakan patahan di batuan sedimen menghasilkan material-material hancuran yang dikenal sebagai gouge. Keberadaan gouge pada bidang patahan dapat berperan sebagai penahan untuk fluida sepanjang patahan. Estimasi nilai dari gouge yaitu Shale Gouge Ratio SGR . Kebanyakan analisis sekatan patahan melibatkan pembuatan peta sekatan patahan yang mana menunjukan peta patahan termasuk juga hangingwall footwall dan estimasi juxtaposisi SGR. Distribusi nilai SGR dan juxtaposisi pada peta distribusi fault-seal akan menentukan sifat sealing dan leaking dari patahan. Untuk itu, melakukan metode analisis sekatan patahan sangatlah penting bukan hanya untuk mengevaluasi cebakan hidrokarbon tapi juga unutk menentukan pengembangan lapangan di masa depan. Penggunaan metoda analisis sekatan patahan pada penelitian ini untuk mengevaluasi hubungan kompartemen reservoir pada lapisan-lapisan batuspasir reservoir pada Formasi Bangko dan Formasi Bekasap di Cekungan Sumatera Tengah. Arsitektur patahan, throw, juxtaposisi, dan SGR diidentifikasi berdasarkan data seismik 3D. Hasil dari studi analisis sekatan patahan menghasilkan 9 patahan besar yang membagi menjadi 9 kompartemen reservoir di lapangan ini, dan telah diidentifikasi. Klasifikasi sekatan patahan berdasarkan nilai transmisibilitas, dan peta penyebaran sekatan patahan akan disiapkan untuk menjelaskan hubungan reservoir sepanjang patahan.ABSTRAK

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ABSTRACT
Fault sealing analysis for structural compartment cnnectivity determination have been conducted in Anin Field Centran Sumatra Basin. Faults in this field generally have compartmentalization and sealing properties, the sealing properties of the faults determined by fault seal analysis FSA study, which is one of the important methods in evaluating hydrocarbon trapping and migration. This study involves characterize and analyze subsurface fault behavior as a result of vertical movement dip slip fault . In most case, fault movement in sedimentary sequences will produce granulated materials known as a gouge. The present of gouge in the fault plane can act as a barrier for fluid across the fault. The estimation value of gouge is Shale Gouge Ratio SGR . Most of FSA involving generate fault seal distribution map which shows fault surface map including hanging wall foot wall and estimate juxtaposition SGR. Distributed SGR values and juxtaposition on fault ndash seal distribution map will determine sealing and leaking behavior of fault. Therefor, conducting an FSA is essential not only for evaluating future hydrocarbon trap but also future field development. We applied FSA method for evaluating reservoir compartment within layer sands on Bangko and Bekasap Formation in Central Sumatra Basin. Faults architecture, throw, juxtaposition, and SGR is identified based on 3D seismic data. The FSA is conducted on 9 major faults and 9 reservoir compartment in the Southern part of Central Sumatra Basin. A generalized classification of fault seal are based on transmissibility, and the fault seal distribution map is prepared to explain the reservoir connectivity along the faults.