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Source Rock Characterization of the Eocene-Miocene, Central Deep, North East Java Basin Fauzan Iqbal Hidayat; Ade Yogi; Eriko Sabra; Taufik Ramli; Muhammad Firdaus; Hanif Mersil Saleh; Gadis Ghia Arviallyn; Andi Setyo Wibowo
Jurnal Geologi dan Sumberdaya Mineral Vol. 23 No. 3 (2022): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v23i3.697

Abstract

This study was conducted to obtain the characteristics of the source rock through organic geochemical analysis in Central Deep, NE Java Basin, in the field off the north coast of Madura. Three samples of Cassiopeia-1, Pollen-1, and Alpha-1 wells were analyzed using organic geochemical methods including Total Organic Carbon analysis, Maturity using vitrinite reflectance, Tmax, and Production Index data, and then analysis of the kerogen type, isoprenoid, sterane, and carbon isotope. Based on those data, an analysis was carried out to determine the origin of the material and the depositional environment. The rock samples in the three wells showed characteristics in TOC, maturity, kerogen type and source of organic material have a similarity. The source rock characteristics have a medium to a good category as source rock and tend to generate gas and a little oil from kerogen types II and III. This source rock is included in the category of immature to mature, deposited in delta until terrestrial depositional environment and contains sources terrestrial and marine organic material.Keywords: Madura, North East Java Basin, organic geochemical, source rock.
SHALE GAS SWEET SPOT POTENTIAL OF TUNGKAL GRABEN, JAMBI SUB-BASIN SOUTH SUMATERA BASIN Taufik Ramli; M. Heri Hermiyanto Z; Andy Setyo Wibowo
Scientific Contributions Oil and Gas Vol. 42 No. 3 (2019): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

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Abstract

The Tungkal Graben is located in Jambi Sub-basin, the northern part of South Sumatera Basin. This basin is known as one of the largest hydrocarbons producing basin in Indonesia. There are several proven source rocks in the South Sumatera Basin. The paralic shales and coal horizon of Talangakar Formation (TAF) are known as primary source rock in this basin and considered as a reservoir of shale gas-bearing in Tungkal Graben Area as well. This study used surface geological data that was collected from the southern foot of Tiga Puluh Mountain as the outcrop analogy and subsurface data (existing well and seismic data) in Tungkal Graben Area. This study applied integrated methods including environmental deposition analysis, organic geochemistry analysis, petrophysical analysis, seismic interpretation, sweet spot delineation, and volumetric of gas in place (GIP) calculation. TAF observed both on the outcrop and well is transition deposit that consists of the dominance of shale and siltstone with interbedded of coal, sandstone, and limestone. Shale and siltstone of TAF have characteristic which is appropriate as a shale gas bearing, with sufficient organic content richness, suitable kerogen type, its maturity entering the early gas generation and proper brittleness index (BI). The sweet spot area is an area that has met the criteria for potential shale gas and determined by pay zone criteria. Depend on the criteria,Net to gross for shale gas is 0.158, early gas generation estimated at a depth of 10250 feet, and sweet spot area reaches 8.9 x 108 ft2. Thus, the total potential of shale gas resources from the calculation using the Ambrose method is 2.12 TCF.
Kerangka Sekuen Stratigrafi Sedimen Oligo-Miosen di Daerah Sarolangun, Cekungan Sumatra Selatan Peri Raudatul Akmal Lubis; Taufik Ramli
Lembaran Publikasi Minyak dan Gas Bumi Vol. 55 No. 2 (2021): LPMGB
Publisher : BBPMGB LEMIGAS

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Abstract

Cekungan Sumatera Selatan merupakan salah satu cekungan yang telah terbukti sebagai penghasil minyak dan gas bumi di Indonesia. Eksplorasi migas telah dilakukan lebih dari satu abad di cekungan ini, tapi masih diharapkan ditemukan adanya penemuan sumberdaya migas baru khususnya di “marginal area” di cekungan ini. Hal ini dapat dilakukan dengan melakukan peninjauan ulang kerangka stratigrafi dengan pendekatan analisis sekuen stratigrafi pada interval berumur Oligosen-Miosen (Formasi Talang Akar dan Formasi Gumai), yang merupakan interval yang menjadi komponen sistem petroleum aktif di Cekungan Sumatera Selatan. Data tujuh sumur yang terdiri atas data log sumur, data biostratigrafi, data deskrpsi cutting dan sidewall core, menjadi data utama yang digunakan dan didukung oleh data seismik 2D. Hasil dari analisis sekuen stratigrafi pada Formasi Talang Akar dan Formasi Gumai ini, diketahui interval ini disusun oleh empat sekuen yang terendapkan pada lingkungan paparan. Empat sekuen ini merupakan sekuen orde tiga. Masing-masing sekuen ini disusun oleh tiga system tract yaitu Lowstand System Tract (LST), Transgressive System Tract (TST) dan Highstand System Tract (HST). Batas sekuen yang diperoleh pada penelitian ini diharapkan dapat digunakan sebagai marker untuk korelasi regional pada interval batuan sedimen berumur Oligosen hingga Miosen.
STRATIGRAFI SIKUEN BATUAN SEDIMEN JURA-KAPUR, PAPUA Rakhmat Fakhruddin; Taufik Ramli; Dzul Fadli
Lembaran Publikasi Minyak dan Gas Bumi Vol. 52 No. 3 (2018): LPMGB
Publisher : BBPMGB LEMIGAS

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Abstract

Unit batuan yang diteliti adalah elemen petroleum system yang penting di wilayah Papua dan sekitarnya. Tujuanpenulisan ini adalah untuk menyusun kerangka stratigrafi sikuen batuan sedimen berumur Jura-Kapur di wilayahPapua. Selanjutnya, hasil dari kerangka stratigrafi sikuen akan digunakan untuk mendeteksi batuan sumberhidrokarbon potensial. Dua lintasan singkapan batuan Jura-Kapur yang diteliti adalah: