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"Lapangan 'X' adalah salah satu lapangan penghasil minyak di Cekungan Sumatera Tengah. Cekungan Sumatera Tengah merupakan salah satu cekungan sedimen penghasil minyak terbesar di Indonesia. Lapangan 'X' adalah area dengan Formasi Bekasap onlaping ke Tinggian Basement. Fitur onlapping berpotensi untuk perangkap stratigrafi. Penelitian ini bertujuan untuk mengidentifikasi potensi perangkap stratigrafi, distribusi reservoir batu pasir, tipe fasies, dan lingkungan pengendapan. Data yang digunakan dalam penelitian ini adalah data seismik 3D, log sumur, dan data inti batuan. Metode penelitian yang digunakan adalah analisis elektrofasies berdasarkan log sumur, atribut seismik, dan model geologi konseptual. Hasil penelitian menunjukkan bahwa ada potensi perangkap stratigrafi dalam bentuk perangkap intra-formasi dan regional. Jebakan intra-formasi dibentuk oleh perselingan batupasir dan litologi serpih secara vertikal dan perubahan fasies lateral, sedangkan jebakan regional dibentuk oleh lapisan serpih Formasi Telisa dan Formasi Bekasap dengan onlap di Tinggian Basement. Berdasarkan inversi AI, dekomposisi spektral 20 Hz, atribut envelope, dan atribut rms amplitudo  menunjukkan distribusi reservoir batupasir A Formasi Bekasap berarah Timurlaut - Baratdaya pada zona onlapping ke Tinggian Basement. Berdasarkan integrasi analisis data batuan inti, elektrofasies, inversi AI, dekomposisi spektral 20 Hz, dan atribut rms amplitudo lingkungan pengendapan reservoir diinterpretasikan sebagai wave dominated delta yang terdiri dari empat fasies: upper shoreface, lower shoreface, distributary channel, dan offshore.

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The 'X' field is an oil-producing field in the Central Sumatera Basin. Central Sumatera Basin is one of the largest oil-producing sedimentary basin in Indonesia. The field is an area in the form of onlaping Bekasap Formation to the Basement High. The onlapping feature has potential for stratigraphic traps. This study aims to identify the potential stratigraphic traps, the distribution of sandstone reservoirs, facies types and the depositional environments. The data used in the study are 3D seismic data, well log, and core data. The research methods used including the analysis of electrofacies based on well log, seismic attributes, and conceptual geology model. The research shows that there is a stratigraphic trap in the form of intra-formation and regional traps. Intra-formation traps were formed vertically by the intersection of sandstone and shale lithologies and lateral facies changes, whereas the regional traps are formed by the shale layer of Telisa Formation and Bekasap Formation with onlapping on the Basement High. Based on AI inversion, spectral-decomposition 20 Hz, envelope, and rms amplitude attributes show the distribution sandstone reservoir A of Bekasap Formation is Northeast - Southwest on onlaping zone to the Basement High. Based on integrated of core data, electrofacies, AI inversion, spectral-decomposition 20 Hz and rms amplitude attributes, the depositional environment of reservoir is interpretated as wave dominated delta which is of four facies: upper shoreface, lower shoreface, distributary channel, and offshore facies."

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Cekungan Ardjuna merupakan cekungan hidrokarbon busur belakang yang sudah matang. Cekungan tersebut mampu berproduksi dan menyimpan resources migas yang belum dapat terpetakan dengan baik. Oleh karena itu perlu dilakukan kajian dari integrasi metode sikuen stratigrafi, inversi seismik, dan evaluasi petrofisika untuk memprediksi potensi hidrokarbon secara lebih rinci dan lebih akurat. Integrasi ini mampu menghasilkan informasi pada struktur contingent mulai dari Play konsep, sistem petroleum, dan property dari karakteristik reservoir, hingga pemetaan kawasan prospect serta evaluasi resiko temuan eksplorasi. Pemahaman karakteristik internal seismik membantu penarikan marker sikuen seismik stratigrafi dalam penampang seismik. Inversi seismik dapat membantu dalam determinasi penyebaran lithofasies, porositas, fluida di penampang seismik. Peta distribusi inversi seismik overlay dengan peta struktur kedalaman reservoir memberikan parameter luasan perangkap untuk reservoir target yang berada pada sistem pengendapan pasang surut. Evaluasi petrofisika dapat membantu memberikan property porositas, netpay thickness, saturasi fluida air, minyak dan gas. Sumberdaya contingent resources ditemukan pada zona target sebesar 5,92 MMBOE (P10 OOIP) dan 10,56 BCF (P10 OGIP). Sumberdaya Prospective Resources sebesar 12,25 MMBOE (P10 OOIP) dan 22.12 BCF (P10 OGIP).

 

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The Ardjuna Basin is a mature back arc hydrocarbon basin. The basin is capable of producing and storing oil and gas resources that cannot be properly mapped. Therefore it is necessary to do a study of the integration of the stratigraphic sequence method, seismic inversion, and petrophysical evaluation to predict hydrocarbon potential in more detail and more accurately. This integration is able to produce information on contingent structures ranging from Play concepts, petroleum systems, and properties from reservoir characteristics, to prospect area mapping and evaluation of risk of exploration findings. Understanding of seismic internal characteristics helps draw stratigraphic sequential seismic markers in seismic cross sections. Seismic inversions can help in the determination of the spread of lithofasies, porosity, fluid in seismic sections. The overlay seismic inversion distribution map with a map of reservoir depth structure provides trapping area parameters for the target reservoir located in the tidal deposition system. Petrophysical evaluation can help provide porosity properties, netpay thickness, water, oil and gas fluid saturation. Contingent resources were found in the target zone of 5,92 MMBOE (P10 OOIP) and 10,56 BCF (P10 OGIP). Prospective Resources are 12,25 MMBOE (P10 OOIP) and 22,12 BCF (P10 OGIP).

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"Lapangan Kale terletak pada Sub Cekungan Jambi, Cekungan Sumatera Selatan dimana lapangan ini berada pada Blok yang aktif menghasilkan minyak dan gas bumi. Keekonomian atau nilai dari suatu lapangan minyak gas sangat penting dalam rangka pengembangan lapangan tersebut. Sehingga studi integrasi antara geologi dan geofisika mengenai karakterisasi reservoar pada lapangan ini sangat diperlukan. Angka yang didapat dalam hal cadangan akan sangat penting bagi seorang reservoir engineer dalam menentukan keekonomian lapangan tersebut. Berbekal data survey seismik 3D dan 4 sumur eksplorasi studi integrasi geologi dan geofisika ini dijalankan. 3 fase studi utama, yaitu analisa petrofisika, dimana kita dapat mengetahui sifat fisik dari batuan reservoar pada tiap sumurnya di lapangan Kale pembuatan impedansi akustik, dimana didahului dengan analisa rock physic pada data sumur, terlihat jelas bahwa impedansi akustik pada data sumur dapat membedakan 3 jenis litologi yang berkembang pada reservoar sand-A formasi LTAF. Pemodelan geologi, dimana impedansi akustik dan juga data dari analisa petrofisika dipakai sebagai input dalam pemodelan geologi ini. Output dari studi ini akan menghasilkan beberapa peta sebaran reservoar, mulai dari peta sebaran fasies dimana berdasarkan data core sumur Kale-2 reservoar sand-A formasi LTAF diendapkan pada lingkungan transisi/ delta. Peta sebaran porositas, dimana kontrol fasies dipakai dalam mempopulasikan porositas pada reservoar sand- A lapangan Kale. Peta sebaran permeabilitas, di buat berdasarkan persamaan antara porositas dan permeabilitas yang ada pada data core, sehingga nilai permeabilitas pada studi ini didapat dari transformasi porositas- permeabilitas dengan menggunakan persamaan tersebut.

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Kale is Field located at Jambi Sub Basin, South Sumatera Basin, which is being a part of one of active blocks in Indonesia. Field economic value is the most important thing in order to develop oil and gas field. Integrated geology and geophysics study for reservoir characterization in this field is urgently needed. For reservoir engineer, reserve estimation from geologist will be used to run the economic evaluation in this field. 3D Seismic data and 4 four exploration wells are used in this integrated G G study. Three primary phases is carried out in order to run this study. Petrophysical analysis in each well in Kale field will be evaluated to have all the petrophysical value in A sand reservoir Acoustic impedance cube generated base on rock physic analysis which is acoustic impedance can divided A sand reservoir into 3 three lithology Geological modeling generated with acoustic impedance cube and petrophysical data as the input. The result of this study is presented in reservoir distribution map, such as facies which is controlled by core data from Kale 2 well that showing this reservoir deposited at delta environment. Porosity distribution map generated with facies distribution control. Porosity permeability plot at Kale 2 well have a good equation will be used to transform porosity value to permeability value."

"Ruteng , capital of Kabupaten manggarai, is situated in the river sediment basin between Poco Ranakan in the southeast and Poco Kuwus in the southwest, at an elevation of 1000 m above mean sea level (msl)...."

"Lapangan A merupakan lapangan offshore yang berada di Laut mid-Norway dan telah memproduksi minyak dan gas bumi cukup lama. Tiga buah sumur digunakan pada penelitian ini dengan kelengkapan data Gamma Ray, NPHI, RHOB, dan log Sonik. Untuk mengidentifikasi reservoir hidrokarbon digunakan metode seismik inversi untuk menghasilkan nilai impedansi akustik dan metode well log berupa gamma ray dan porositas guna menggambarkan penyebaran batu pasir pada reservoir hidrokarbon. Dalam proses inversi dibuat dua buah horison yaitu top dan bottom dengan kontrol tiga buah sumur.

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Field A is an offshore field, located in the mid-Norway Sea and has been producing oil and gas for a while. Three wells were used in this study that have Gamma Ray, NPHI, RHOB, and sonic logs. Seismic inversion method is used to identify the hydrocarbon reservoir then to deliver an acoustic impedance. Well log analysis such as gamma ray, porosity, and density are used to illustrate lithology of hydrocarbon reservoir. Inversion method created two horizons ,the top and bottom, with three wells controls."

"Daerah penelitian berada pada Lapangan XYZ yang merupakan bagian dari Cekungan Sumatera Tengah. Penelitian ini mengkaji potensi perangkap stratigrafi sistem onlap Formasi Bekasap pada tinggian basement, berdasarkan pendekatan konsep sekuen stratigrafi. Tujuannya untuk menentukan potensi jebakan stratigrafi pada Formasi Bekasap dimana hidrokarbon dapat terakumulasi. Penemuan jebakan stratigrafi diharapkan dapat menjadi alternatif perangkap hidrokarbon sehingga dapat menahan laju penurunan produksi lapangan XYZ. Data utama yang digunakan dalam studi ini adalah data log sumur, data batuan inti dan data seismik 3D sedangkan data tambahan berupa data biostratigrafi dan data tekanan formasi. Data batuan inti dan data biostratigrafi digunakan dalam menentukan fasies dan lingkungan pengendapan. Pada studi ini dilakukan korelasi sumur dan pemetaan isochore, atribut RMS amplitudo seismik dan peta frekuensi rendah10 Hz dan 15 Hz. Integrasi data yang diperoleh digunakan untuk mendukung analisis mengenai pemodelan lingkungan pengendapan serta penentuan potensi jebakan stratigrafi Formasi Bekasap. Hasil analisis menunjukkan bahwa Formasi Bekasap terdiri dari fasies estuarine channel, estuarine bar dan bar shoreline. Fasies tersebut terendapkan pada lingkungan estuarin hingga laut dangkal. Potensi jebakan stratigrafi berupa jebakan isolated bar yang berada dibagian selatan Lapangan XYZ, dengan potensi resources sebesar 5,400.54 MBO.

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The research site, located in XYZ field, is part of the Central Sumatra Basin. This study examines stratigraphic trap potential Bekasap Formation onlap system on high basement, based on sequence stratigraphic concept. Which is intended to determine the stratigraphic trap potential of the Bangko formations where hydrocarbons accumulate. Thus, the discovered stratigraphic traps are expected to be alternatives to hydrocarbon trap so that they can restrain the rate of decline oil production in XYZ field.

The primary data in this study are well log, core, and 3D seismic, and the secondary data are that of biostratigraphy and formation pressure data. The seismic-well tie is conducted to tie the seismic data to well log prior to seismic mapping. This study generates well log correlation and mapping isochore, RMS amplitude seismic and low frequency 10 Hz and 15Hz map. The integration of all collected data is to support the analysis of the depositional environment modeling and to determine potential stratigraphic traps of the Bekasap Formation. Bekasap Formation consists of estuarine channel facies, estuarine shoreline bar and estiarine bar.

The facies shows that the Bekasap Formation in XYZ Field is generally deposited on the estuarine environment to the shallow marine. Potential stratigraphic trap on Bekasap Formation is isolated bar located in the southern part of XYZ Field with total resources 5,400.54 MBO."

"[ABSTRAKLapangan Athar mulai berproduksi sejak tahun 1975 dengan produksi kumulatif mencapai 900 MMbbls dan RF 50%. Pada tahun 2011 dilakukan akuisisi seismik 3D untuk melihat remaining potential yang ada di lapangan ini. Analisa seismik 3D dengan atribut seismik dan inversi simultan memberikan hasil yang cukup baik untuk menentukan penyebaran batupasir dan hidrokarbon yang ada di dalam nya. Volume densitas hasil inversi, atribut minimum amplitude, dan atribut arc length membantu dalam mengidentifikasi penyebaran reservoar. Lambda-Rho dan AI membantu dalam mengidentifikasi area-area yang mengandung hidrokarbon. Interpretasi struktur di seismik menunjukkan adanya sesar minor, yang sebelumnya tidak teridentifikasi pada seismik 2D. Hasil analisa seismik digunakan dalam pembuatan 3D geomodel. Penentuan batas channel, dan area hidrokarbon di dipandu hasil dari analisa seismik dan data sumur. Empat tubuh channel teridentifikasi dari analisis tersebut, sementara overbank deposit disebarkan secara statistik. Data interpreasi struktur digunakan untuk menentukan jumlah segmen atau kompartemen, dan hasilnya adalah lima segmen selatan dan satu segmen utara terdapat di zona dangkal Lapangan Athar. Hasil pemodelan geologi menunjukkan bahwa segmen 5 menjadi area yang masih memiliki prosepek untuk produksi minyak, sementara segmen 2 memiliki prospek untuk produksi gas.

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ABSTRACTAthar Field start producing since 1975 up to now with cummulative production reached 900 MMbbls and RF 50%. 3D seismic was acquired in 2011 to identify the remaining potential in this field. Analysis of 3D seismic with attribute and simultaneous inversion provide a good result to determine reservoar distribution and hydrocarbon contained. Density cube from inversion, minimum amplutide attribute, anda arc length attribute are used to map the sand distribution. Lambda Rho and AI (Ip) are usefull to identify the remaining hyrocarbon area. Structural interpretation from seismic shows there are minor faults which is not identified before with 2D seismic. The result of the analysis was used to create 3D Geomodel. The channel limit determination, and remaining hydrocarbon area guided by analysis from seismic and well data. As a result, four channel bodies were identified, whilst overbank deposit distributed statistically. Structural interpretation data used to determine the number of segment or compartment, and the result are five segments in the south and one segment in the north identified in the shallow zone Athar Field. The result of geological modeling shows that segment 5 still has prospect in oil production, whilst segment 2 has prospect in gas production.;Athar Field start producing since 1975 up to now with cummulativeproduction reached 900 MMbbls and RF 50%. 3D seismic was acquired in 2011 toidentify the remaining potential in this field.Analysis of 3D seismic with attribute and simultaneous inversion provide agood result to determine reservoar distribution and hydrocarbon contained. Densitycube from inversion, minimum amplutide attribute, anda arc length attribute are usedto map the sand distribution. Lambda Rho and AI (Ip) are usefull to identify theremaining hyrocarbon area. Structural interpretation from seismic shows there areminor faults which is not identified before with 2D seismic.The result of the analysis was used to create 3D Geomodel. The channel limitdetermination, and remaining hydrocarbon area guided by analysis from seismic andwell data. As a result, four channel bodies were identified, whilst overbank depositdistributed statistically. Structural interpretation data used to determine the number ofsegment or compartment, and the result are five segments in the south and onesegment in the north identified in the shallow zone Athar Field.The result of geological modeling shows that segment 5 still has prospect inoil production, whilst segment 2 has prospec in gas production, Athar Field start producing since 1975 up to now with cummulativeproduction reached 900 MMbbls and RF 50%. 3D seismic was acquired in 2011 toidentify the remaining potential in this field.Analysis of 3D seismic with attribute and simultaneous inversion provide agood result to determine reservoar distribution and hydrocarbon contained. Densitycube from inversion, minimum amplutide attribute, anda arc length attribute are usedto map the sand distribution. Lambda Rho and AI (Ip) are usefull to identify theremaining hyrocarbon area. Structural interpretation from seismic shows there areminor faults which is not identified before with 2D seismic.The result of the analysis was used to create 3D Geomodel. The channel limitdetermination, and remaining hydrocarbon area guided by analysis from seismic andwell data. As a result, four channel bodies were identified, whilst overbank depositdistributed statistically. Structural interpretation data used to determine the number ofsegment or compartment, and the result are five segments in the south and onesegment in the north identified in the shallow zone Athar Field.The result of geological modeling shows that segment 5 still has prospect inoil production, whilst segment 2 has prospec in gas production]"

"Penelitian mengenai tekanan pori dilakukan pada Formasi Talang Akar dan Baturaja, Sub-Cekungan Jambi, Cekungan Sumatera Selatan. Cakupan penelitian berfokuskan pada wilayah yang mengalami overpressure atau tekanan pori melebihi normal. Analisis mengenai tekanan pori dilakukan sebagai upaya mengoptimalkan proses pengeboran di wilayah yang akan dilakukan pengembangan sumur. Pengolahan data terbagi menjadi dua, yaitu pengolahan tekanan pori pada data sumur dan penyebarannya menggunakan data seismik. Dalam melakukan estimasi nilai tekanan pori pada sumur, digunakan metode dasar tekanan pori, yaitu metode Eaton. Selanjutnya, dilakukan penyebaran tekanan pori pada data seismik menggunakan neural network dengan data masukan berupa kecepatan gelombang P dan inversi impedansi elastik. Penggunaan data tersebut dipilih karena cukup efektif dalam melakukan estimasi persebaran tekanan pori yang dikontrol oleh keberadaan litologi dan fluida. Selain itu, dilakukan pemodelan substitusi fluida guna menguatkan analisis persebaran gas pasiran.Dari pengolahan data didapatkan bahwa terdapat zona overpressure di Formasi Talang Akar dengan kedalaman 6030.184 ft - 6368.5 ft. Sedangkan pada Formasi Batu Raja tidak terlihat anomali tekanan pori yang signifikan. Keberadaan fluida hidrokarbon berupa gas pasiran di antara litologi shale dan keberadaan struktur patahan diduga menjadi penyebab terjadinya anomali berupa overpressure.

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Research on pore pressure was carried out in the Talang Akar and the Batu raja Formation, Jambi Sub-Basin, South Sumatra Basin. The scope of research focuses on areas that experience overpressure or the pore pressure exceeds normal. Analysis of pore pressure is carried out as an effort to optimize the drilling process in areas where well development will be carried out. The data processing is divided into two, namely the processing of pore pressure in the well data and its distribution using seismic data. In estimating the value of pore pressure in drilling wells, the basic method for calculating pore pressure is used, namely the Eaton method. Next, the distribution of pore pressure estimates on seismic data is carried out using a neural network with input data in the form of P wave velocity and elastic impedance inversion. The use of input data was chosen because it is quite effective in estimating the pore pressure distribution which is controlled by the presence of lithology and fluids. In addition, fluid substitution modeling was carried out to strengthen the analysis of the distribution of sandy gas.

From the data processing carried out, it was found that there are zones overpressure in the Talang Akar Formation with a depth of 6030.184 ft to 6368.5 ft. Whereas in the Batu Raja Formation there is no significant pore pressure anomaly. The presence of hydrocarbon fluids in the form of sandy gas between lithology shale and the existence of a fault structure is thought to be the cause of the anomaly in the form of overpressure."

"ABSTRAKStudi menggunakan metoda seismik telah diterapkan dalam penelitian ini untuk menginterpretasi dan mendelineasi penyebaran reservoar Gita sand di Lapangan S. Dengan menggunakan inversi seismik, kita bisa mendapatkan model geologi penyebaran reservoar melalui penampang dan slicing P-impedance. Lapangan S terletak di sebelah utara Cekungan Asri dan merupakan lapangan eksplorasi yang belum pernah ditemukan potensi hidrokarbon. Hipotesis awal dari analisa sensifitas menunjukkan bahwa data sumur memiliki sensifitas terhadap P-impedance untuk memisahkan litologi. Analisa hasil inversi membantu interpretasi model geologi menjadi lebih akurat dan juga menunjukkan bahwa reservoar tersebar di sekitar prospek eksplorasi Undip B-1. Hasil penelitian membuktikan bahwa prospek Undip B-1 dapat menjadi prospek hidrokarbon baru di lapangan S.

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AbstractSeismic inversion method has been applied to interpret and delineate reservoir distribution of Gita sand in S field. Using seismic inversion, it can get reservoir distribution model through P-impedance section and slicing. S field is exploration field located in the northern part of Asri Basin and there was no found hydrocarbon potential previously in this field. Initial review from sensitivity analysis shows that well data has sensitivity to p=impedance to classify lithology. The inversion result helps geological model interpretation to be more accurate and also shows resevoir distribution around exploration prospect Updip B-1. The result of this study prove that exploration prospect Updip B-1 can be new hydrocarbon prospect in S field"