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Karakteristik Geokimia Organik Formasi Talang Akar pada Graben Bandar Agung dan Tanjung Miring, Sub-Cekungan Palembang Selatan: Implikasinya Pada Paleodepositional Setting dan Potensi Generasi Hidrokarbon Yoga Andriana Sendjaja, Yara Regina, Ildrem Syafri,
Geoscience Journal Vol 1, No 3 (2017): Padjadjaran Geoscience Journal
Publisher : Unpad

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Formasi Talang Akar Pada Graben Bandar Agung dan Tanjung Miring, Sub-Cekungan Palembang Selatan evaluasi menggunakan data geokimia dari dua puluh sampel sedimen (cuttings) dari empat sumur eksplorasi untuk analisis batuan induk meliputi kuantitas, kualitas, dan kematangan. Penelitian lebih lanjut menggunakan tiga ekstrak batuan yang dianalisis menggunakan metode geokimia molekular terdiri atas n-alkana, isoprenoids, terpana, dan sterana untuk mengetahui karakteristik geokimia organik, asal material organik, paleodepositinal setting, dan potensinya untuk menggenerasikan hidrokarbon. Berdasarkan hasil analisis geokimia organik, Formasi Talang Akar pada Graben Bandar Agung dan Tanjung miring memiliki kekayaan material organik good sampai excellent dengan tingkat kematangan early mature sampai peak mature. Sampel batubara pada Graben Tanjung Miring dan sampel batulempung pada Graben Bandar Agung merupakan bagian dari Formasi Talang Akar Bawah yang diendapkan pada lingkungan fluvio-deltaic dibawah kondisi suboksik sampai oksik dan kontribusi dominan dari tumbuhan tingkat tinggi. Sedangkan, sampel batulempung serpih Formasi Talang Akar pada Graben Tanjug Miring diinterpretasikan merupakan bagian dari Formasi Talang Akar Atas yang diendapkan pada lingkungan delta/laut dangkal dibawah kondisi suboksik sampai oksik dengan kontribusi dominan dari alga laut. Jenis material organik pada batuan induk berasosiasi dengan tipe kerogen dan jenis hidrokarbon tertentu yang digenerasikan dari suatu batuan induk, menunjukkan sampel Formasi Talang Akar yang memiliki nilai Indeks Hidrogen (HI) dibawah 200 mg HC/g TOC (kerogen tipe III) berpotensi tinggi untuk menggenerasikan hidrokarbon jenis gas, sedangkan sampel yang memiliki nilai HI lebih tinggi dari 200 mg HC/g TOC hanya dapat meggenerasikan minyak bumi dalam jumlah yang terbatas.Â Kata kunci: Geokimia organik, Paleodepositional setting, Formasi Talang Akar, Generasi Hidrokarbon

Depositional Environment and Source Rocks Potential of the Miocene Organic Rich Sediments, Balikpapan Formation, East Kutai Sub Basin, Kalimantan Permana, ST.,M.Sc., Asep Kurnia; Sendjaja, Yoga Andriana; Panggabean, Hermes; Fauzely, Lili
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 3 (2018): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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The fluvial to deltaic sediments of the onshore petroleum prolific of the Mahakam Delta in the East Kutai Sub-basin constrain organic rich sediments particularly within the Balikpapan Formation. This formation has been recognized as a source rocks of the conventional oil and gas production in the Kutai Basin. However, the geochemical studies to understand the origin of organic matter and paleo-environmental condition of this formation are still limited. A 390 selected samples of organic rich sediments from the Balikpapan Formation were analyzed by using organic petrographic and geochemical analyses. These analyses were used to define the sedimentary organic matter and moreover the paleo-environment conditions during deposition and their implication to the source rocks and hydrocarbon potential. The organic rich shales and mudstones of this sediment have high total organic content (TOC) values in range of 0.05% – 15.63% and coals are ranging from 2.25% to 57.11%. They are and mainly dominated by vitrinite maceral, with minor liptinite and inertinite. The minerals mostly consist of clay minerals, with minor pyrite and oxide minerals (quartz and carbonates). Rock Eval Pyrolisis analysis results show low hydrogen index (HI) values (4 to 248.52mgHC/g TOC) and predominance of vitrinite maceral reveal prevalence of terrestrially derived type III organic matter and their potential to generate gas. The max temperature values which is ranging from 411 to 435°C and Ro ranges 0.7% - 0.64% implies a low to moderate thermal maturation levels for an active source rocks. The organic matter accumulation is mainly associated with black shales and coals in the delta plain environment, derived from terrigenous organic matter.Keyword: Depositional environment, source rocks, Balikpapan Formation, Kutai Basin.

Analisis Multi Raster SRTM, Radarsat dan Landsat untuk Karakterisisasi Morfo-struktur dari Geometri Sesar di Daerah Binuang, Kalimantan Selatan Jamal, Jamal; Sulaksana, Nana; Sukiyah, Emi; Andriana Sendjaja, Yoga
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 1 (2019): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

The Binuang area and its surroundings are genetically structural landforms which characterized by cuesta ridge line with curve lineaments pattern on northeast-southwest direction. Geomorphological approach were carried out to determine structural geometry of geological surface using qualitative and quantitative approach on multiple map analysis of remote sensing data. The result of quantitative analysis on elevation data are used to classify heights, slope shape and steepness, lineaments, drainage, and slope aspect. Optical images were classified to determine lithological pattern and boundaries through analysis of band ratios, decorrelation stretch, principal component, and spatial enhancement. The research area are classified into eight class of structural landforms, depicting deformations that occured in western flank of Meratus Mountains. The surface pattern indicates the influence of compressional stress, shown by fold belt with longitudinal characteristic and fault-bounded anticlines on northeast-southwest axis. The formation of main structure pattern on research area was compared with that on strike-slip fault analog model. The resulting correlation factor, R=0.932, shows that both of them are highly correlated. In conclusion, surface structure can possibly form another variation of thrusted mountain belt, such as thrust-dominated restraining bends.Keywords: landsat, SRTM, morphostructure, morphometry, rhomboidal pattern, Meratus.

Biomarker Composition of Some Oil Seeps from West Sulawesi, Indonesia Sutadiwiria, Yarra; Hamdani, Ahmad Helman; Sendjaja, Yoga Andriana; Haryanto, Iyan; Yeftamikha, Yeftamikha
Indonesian Journal on Geoscience Vol 5, No 3 (2018)
Publisher : Geological Agency

DOI: 10.17014/ijog.5.3.211-220A suite of oil seep samples collected from the Lariang and Karama Basins, West Sulawesi, Indonesia, have been analyzed using GC and GCMS techniques. Their biomarker compositions have been used to reveal the likely source rock that produces oil. These oil seep samples contain a range in both the concentration of hydrocarbons present and certain level of biodegradation experienced. All sterane m/z 217 data display a familiar pattern of steranes with carbon numbers from 27 to 29 together with pregnane and homo-pregnanes, including rearranged steranes. Triterpane (m/z 191) data show a moderate content of tricyclic terpanes (Tri/C30H), medium to high ratio of norhopane/hopane (C29/C30), and medium to high abundant land plan marker such as resin bicadinanes(Bic/C30H) and oleananes (Ol/C30H). The presence of high abundant oleananes in these samples has been interpreted as the evidence for a marine influence during early diagenesis that may occur by marine or via re-deposition of peat organics in marine sediments. Hence, these results state that the organic matter facies for their source rock oil seep samples from the West Sulawesi region are detected as mixed between allochthonous macerals from typical terrestrial higher plants transported into the basin from distal swamps and soils and some marine organic matter.

Biomarker Composition of Some Oil Seeps from West Sulawesi, Indonesia Sutadiwiria, Yarra; Hamdani, Ahmad Helman; Sendjaja, Yoga Andriana; Haryanto, Iyan; Yeftamikha, Yeftamikha
Indonesian Journal on Geoscience Vol 5, No 3 (2018)
Publisher : Geological Agency

DOI: 10.17014/ijog.5.3.211-220A suite of oil seep samples collected from the Lariang and Karama Basins, West Sulawesi, Indonesia, have been analyzed using GC and GCMS techniques. Their biomarker compositions have been used to reveal the likely source rock that produces oil. These oil seep samples contain a range in both the concentration of hydrocarbons present and certain level of biodegradation experienced. All sterane m/z 217 data display a familiar pattern of steranes with carbon numbers from 27 to 29 together with pregnane and homo-pregnanes, including rearranged steranes. Triterpane (m/z 191) data show a moderate content of tricyclic terpanes (Tri/C30H), medium to high ratio of norhopane/hopane (C29/C30), and medium to high abundant land plan marker such as resin bicadinanes(Bic/C30H) and oleananes (Ol/C30H). The presence of high abundant oleananes in these samples has been interpreted as the evidence for a marine influence during early diagenesis that may occur by marine or via re-deposition of peat organics in marine sediments. Hence, these results state that the organic matter facies for their source rock oil seep samples from the West Sulawesi region are detected as mixed between allochthonous macerals from typical terrestrial higher plants transported into the basin from distal swamps and soils and some marine organic matter.

Biomarker Composition of Some Oil Seeps from West Sulawesi, Indonesia Sutadiwiria, Yarra; Hamdani, Ahmad Helman; Sendjaja, Yoga Andriana; Haryanto, Iyan; Yeftamikha, Yeftamikha
Indonesian Journal on Geoscience Vol 5, No 3 (2018)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17014/ijog.5.3.211-220

DOI: 10.17014/ijog.5.3.211-220A suite of oil seep samples collected from the Lariang and Karama Basins, West Sulawesi, Indonesia, have been analyzed using GC and GCMS techniques. Their biomarker compositions have been used to reveal the likely source rock that produces oil. These oil seep samples contain a range in both the concentration of hydrocarbons present and certain level of biodegradation experienced. All sterane m/z 217 data display a familiar pattern of steranes with carbon numbers from 27 to 29 together with pregnane and homo-pregnanes, including rearranged steranes. Triterpane (m/z 191) data show a moderate content of tricyclic terpanes (Tri/C30H), medium to high ratio of norhopane/hopane (C29/C30), and medium to high abundant land plan marker such as resin bicadinanes(Bic/C30H) and oleananes (Ol/C30H). The presence of high abundant oleananes in these samples has been interpreted as the evidence for a marine influence during early diagenesis that may occur by marine or via re-deposition of peat organics in marine sediments. Hence, these results state that the organic matter facies for their source rock oil seep samples from the West Sulawesi region are detected as mixed between allochthonous macerals from typical terrestrial higher plants transported into the basin from distal swamps and soils and some marine organic matter.

Biomarker Composition of Some Oil Seeps from West Sulawesi, Indonesia Yarra Sutadiwiria; Ahmad Helman Hamdani; Yoga Andriana Sendjaja; Iyan Haryanto; Yeftamikha Yeftamikha
Indonesian Journal on Geoscience Vol 5, No 3 (2018)
Publisher : Geological Agency

DOI: 10.17014/ijog.5.3.211-220A suite of oil seep samples collected from the Lariang and Karama Basins, West Sulawesi, Indonesia, have been analyzed using GC and GCMS techniques. Their biomarker compositions have been used to reveal the likely source rock that produces oil. These oil seep samples contain a range in both the concentration of hydrocarbons present and certain level of biodegradation experienced. All sterane m/z 217 data display a familiar pattern of steranes with carbon numbers from 27 to 29 together with pregnane and homo-pregnanes, including rearranged steranes. Triterpane (m/z 191) data show a moderate content of tricyclic terpanes (Tri/C30H), medium to high ratio of norhopane/hopane (C29/C30), and medium to high abundant land plan marker such as resin bicadinanes(Bic/C30H) and oleananes (Ol/C30H). The presence of high abundant oleananes in these samples has been interpreted as the evidence for a marine influence during early diagenesis that may occur by marine or via re-deposition of peat organics in marine sediments. Hence, these results state that the organic matter facies for their source rock oil seep samples from the West Sulawesi region are detected as mixed between allochthonous macerals from typical terrestrial higher plants transported into the basin from distal swamps and soils and some marine organic matter.

PENENTUAN LINGKUNGAN PENGENDAPAN LAPISAN BATUBARA D, FORMASI MUARA ENIM, BLOK SUBAN BURUNG, CEKUNGAN SUMATERA SELATAN Asep Bahtiar Purnama; Silti Salinita; Sudirman Sudirman; Yoga Andriana Sendjaja; Budi Muljana
Jurnal Teknologi Mineral dan Batubara Vol 14, No 1 (2018): Jurnal Teknologi Mineral dan Batubara Edisi Januari 2018
Publisher : Puslitbang tekMIRA

Lapisan batubara D termasuk ke dalam Blok Suban Burung, Formasi Muara Enim, Subcekungan Palembang Tengah, Cekungan Sumatera Selatan, berumur Miosen Tengah sampai Miosen Akhir. Penelitian ini bertujuan untuk mengetahui karakteristik batubara dan lingkungan terhadap percontoh Lapisan Batubara D dari kegiatan pengeboran penelitian gasifikasi bawah permukaan. Metode yang digunakan adalah analisis petrografi batubara, nilai reflektansi vitrinit, dan interpretasi lingkungan pengendapan berdasarkan diagram Diessel dan diagram Calder. Lapisan batubara ini didominasi oleh vitrinit, rata-rata sekitar 71,1%, diikuti inertinit 17,6%, liptinit 5,9%, dan mineral 6,4%. Nilai reflektansi vitrinit berkisar antara 0,25-38%, termasuk ke dalam peringkat lignit-subbituminus. Berdasarkan hasil rekonstruksi lingkungan pengendapan menggunakan empat parameter TPI (Tissue Preservation Index), GI (Gelification Index), GWI (Ground Water Index) dan VI (Vegetation Index) dan diplot dalam diagram Diessel dan diagram Calder diketahui bahwa Lapisan Batubara D diendapkan dalam lingkungan pengendapan limnik.

Litofasies Dan Lingkungan Pengendapan Pada Formasi Elat, Kecamatan Kei Besar, Kabupaten Maluku Tenggara, Maluku Chrisany Hukubun; ⠀ Abdurrokhim; Yoga Andriana Sendjaja; Wiwien Gaby Hukubun
JURNAL GEOLOGI KELAUTAN Vol 20, No 1 (2022)
Publisher : Pusat Penelitian dan Pengembangan Geologi Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/jgk.20.1.2022.759

Daerah Kei Besar merupakan bagian timur busur banda tepatnya pada zona lengkungan sistem busur banda bagian timur yang didominasi oleh batuan karbonat. Informasi mengenai fasies dan lingkungan pengendapan Formasi Elat berdasarkan batuan yang tersingkap masih sangat sedikit sehingga diperlukan penelitian yang lebih akurat. Metode penelitian yang digunakan adalah observasi 31 stasiun pengamatan dan pengukuran penampang stratigrafi pada 5 lintasan penelitian. Hasil penelitian menunjukkan Formasi Elat didominasi oleh litologi kalkarenit dan batulempung.yang digolongkan menjadi 6 litofasies yaitu alternating calcarenite & shale, amalgamated calcarenite, blocky calcarenite, structurless mud, slump deposit dan coarsening upward calcarenite. Asosiasi fasies berdasarkan 5 lintasan penelitian menunjukkan lingkungan pengendapan daerah penelitian berdasarkan Wilson (1975) adalah Foreslope, Deep Shelf Margin dan Open Sea Shelf. Sedangkan berdasarkan Christopher G St C Kendall (2012) lingkungan pengendapan daerah penelitian adalah Lower Slope, Middle Fan dan Lower Fan. Sejarah pengendapan Formasi Elat dimulai dengan mengendapnya litofasies alternating calcarenite & shale pada Channel Complex, setelah itu terbentuk litofasies amalgamated calcarenite, blocky calcarenite dan coarsening upward calcarenite pada lingkungan Middle Fan dan pada akhirnya pada Lower Fan terbentuknya litofasies structurless mud dan alternating calcarenite & shale. Proses sedimentasi Formasi Elat termasuk dalam siklus sedimentasi yang berada pada fase low stand system tract.

Geochemistry and Potential Hydrocarbon Source Rocks of Rambatan Formation in Karangkobar Area, Central Java Praptisih Praptisih; Yoga Andriana Sendjaja; Vijaya Isnaniawardhani; Anggoro Tri Mursito; Purna Sulastya Putra; Septriono Hari Nugroho
Indonesian Journal of Chemistry Vol 22, No 6 (2022)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.73162

The purpose of the study in the Karangkobar area was to investigate the source rock potential of the fine-grained surface samples of clastic sediments. The use of surface samples for source rock potential study in Indonesia is still limited. We conducted geochemical laboratory analyses in this research, including Total Organic Carbon (TOC), Rock-Eval Pyrolysis (REP), and Gas chromatography–mass spectrometry (GCMS). Seventeen samples have been analyzed for their TOC content. The result shows that TOC values varied between 0.36–1.55%, indicating that the source rock potential level based on the surface samples is poor to fair organic richness. REP was conducted on 16 samples, and the results show that the hydrocarbon-generating characteristics (HI values) ranged from 15 to 163 mg HC/g TOC. The kerogens identified included type II and III kerogen, which indicated the oil and gas-generating potential. Pyrolysis temperature is at maximum (Tmax) in the 276–458 °C, indicating that the samples were thermally immature to mature. GCMS analysis of source rock indicated that the depositional environment of the organic material derived from an open marine and plankton environment. This study is essential to complete the understanding of the petroleum system in Central Java.

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