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All Journal Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Joko Wahyudiono
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Chemistry Earth & Planetary Sciences Energy

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KONTROL STRUKTUR PADA POLA “ZIG-ZAG” ALIRAN SUNGAI KAYAN DI DAERAH PESO, KALIMANTAN TIMUR Baharuddin Baharuddin; Joko Wahyudiono
Jurnal Geologi dan Sumberdaya Mineral Vol. 17 No. 3 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v17i3.288

Abstract

Peso Area is situated at the downstream of Kayan River, East Kalimantan. The area is generally occupied by a flysch-type deposit of Cretaceous Rajang-Embaluh Group. The unit is unconformably overlain by the Tertiary Sediments and is intruded by the Tertiary-Quaternary magmatics. Based on interpretation of landsat imagery, lineament features which represent faults can be traced outside the studied area. Based on landsat imagery data and result of joints, fault and fold analyses, it can be concluded that the zig-zag pattern of the Kayan River at Peso area is closely related to major faults movements. These faults are generally trending NE- SW and NW-SE. Keywords : structural control, zig-zag patterns, Kayan River
Rock-Eval Characteristic of Oligosen Fine-grained Sedimentary Rocks from Pamaluan Formation, Gunung Bayan Area, West Kutai Basin, East Kalimantan : Implication for Hydrocarbon Source Rock Potential Moh. Heri Hermiyanto Zajuli; Joko Wahyudiono
Jurnal Geologi dan Sumberdaya Mineral Vol. 19 No. 2 (2018): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v19i2.343

Abstract

In this study, we apply organic geochemistry analysis for evaluating source rocks in Gunung Bayan Areas, West Kutai Basin. Subject of this research are Oligocene fine-grained sedimentary rocks of Pamaluan Formation on Gunung Bayan Areas. The Oligosen fine-grained sedimentary rock of Pamaluan Formation consists of shale, siltstone and claystone. The organic geochemistry analysis includes pyrolysis data as total organic carbon(TOC%), generating source potential (S2), production index (PI), oxygen and hydrogen indices(OI, HI) and (Tmax). The results show that the Oligocene source rocks have poor into good quality with type III kerogen and have true capability to generate  gas. The source rocks candidate is  characterized by HI 5 - 115 (mg/g), TOC from 0.19 to 1.78 wt%, S1 from 0.01 to 0.09 (mg/g) and S2 from 0.05 to 1.74 (mg/g) that indicating poor to fair source rocks with type III kerogen and capable of generate  gas. The maturity of the fine-grained sedimentary rocks tend to indicate immature to mature stage. Overall fine-grained sedimentary rocks of Pamaluan Formation has capability to produced gas with poor to fair quality. 
Aspek Petrografi Batugamping di Daerah Timor Tengah Selatan Sigit Maryanto; Asep Kurnia Permana; Joko Wahyudiono
Jurnal Geologi dan Sumberdaya Mineral Vol. 19 No. 2 (2018): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v19i2.396

Abstract

Microfacies and diagenetic aspects of limestones in the South Central Timor, East Nusa Tenggara have studied to investigate the deposition mechanism of the rocks and history of geological process after the rocks deposition. The cropped out of limestones in the research area includes into four rock units, are Aitutu Formation from Triassic, Nakfunu Formation from Early Cretaceous, Menu Formation from Late Cretaceous, and Ofu Formation from Paleogene. Limestone petrography analysis have been done on eighteen samples from the Aitutu Formation, fourty two samples from the Nakfunu Formation, nineteen samples from the Menu Formation, and seven samples from the Ofu Formation. Based on the study of limestones mikrofasies and diagenesis that has been done, proved are the fourth formation could be act as a source and reservoir for hydrocarbon. Keywords: Limestone, petrography, microfacies, diagenetic, hydrocarbon
Proses Diagenesis Batupasir Formasi Kanikeh, Seram Bagian Timur, Maluku, Indonesia Akhmad Khahlil Gibran; Aries Kusworo; Joko Wahyudiono; Eko Bayu Purwasatriya
Jurnal Geologi dan Sumberdaya Mineral Vol. 23 No. 2 (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.v23i2.412

Abstract

Batupasir Formasi Kanikeh yang berumur Carnian-Norian, tersebar dari Maluku hingga Maluku Tenggara. Formasi Kanikeh terendapkan pada lingkungan transisi dan karakter reservoir pada formasi ini masih belum banyak diungkap. Studi ini fokus terhadap pengaruh diagenesis terhadap karakteristik reservoir pada sikuen batupasir berumur Carnian-Norian di Daerah Seram Bagian Timur, Maluku. Metode yang digunakan adalah pengamatan petrografi dan Scanning Electron Microscope-Energy Dispersive Spectrometer (SEM-EDS). Hasil pengamatan petrografi menunjukkan batupasir pada Seram Bagian Timur ini didominasi oleh lithic wacke, litharenite, dan arkose. Dari pengamatan SEM-EDS, mineral yang teramati termasuk dalam grup silika yang berasal dari kelompok mineral silika, feldspar, mineral lempung, dan mineral mika. Kelompok silika berupa butiran kuarsa. Kelompok feldspar yang teramati adalah K-feldspar yang berupa butiran. Kelompok mineral lempung paling dominan muncul di antaranya smektit, illit, kaolinit, halloisit. Kelompok mika yang teramati adalah muskovit. Diagenesis yang terjadi pada batupasir ini termasuk kompaksi; sementasi kalsit, kuarsa, mineral lempung, dan oksida besi; pelarutan; dan rekahan pada butiran karena tektonik. Butiran klastik yang tidak stabil, seperti feldspar mengalami alterasi menjadi mineral lempung. Berdasarkan karakteristik diagenesis tersebut, batupasir Formasi Kanikeh pada daerah ini memiliki karakter reservoir yang dapat diabaikan.Katakunci: Diagenesis, Kanikeh, reservoir, Seram.
Chemostratigraphy and Paleoenvironment of the Miocene Organic Rich Sediments in the East Kutai Sub-Basin, Indonesia Asep Kurnia Permana; Aris Kusworo; Joko Wahyudiono; Y A. Sendjaja; Hermes Panggabean; L Fauziely
Jurnal Geologi dan Sumberdaya Mineral Vol. 23 No. 1 (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.v23i1.660

Abstract

The Miocene sedimentary rocks in Samarinda area constrains organic rich sediments, which are considered as a good source rocks hydrocarbon in the East Kutai Sub-Basin, Kalimantan. The high organic material content within the sediments is related to the dynamics of depositional environment in deltaic setting. The accumulation and characteristics of organic matter in this area may be influenced by multiple factors, under a complex physical-chemical processes. Geochemical data of major and trace elements obtained for a total 309 outcrop samples from four locations were interpreted to define chemostratigraphic and paleoenvironmental conditions (paleoproductivity, detrital influx, paleoredox and paleosalinity) responsible for organic carbon accumulation and source rocks characterization. Stratigraphic variation in inorganic geochemistry allows two chemostratigraphic packages to be defined and correlated within the Miocene sedimentary sequences. These chemostratigraphic packages are geochemically differentiated using SiO2/Al2O3, TiO2/Al2O3, Na2O/Al2O3, TiO2/Nb and Sr/Ba ratio values. The chemical alteration index (CIA) suggests that the sedimentary unit was deposited in a hot and humid climate, with moderate to intensive weathering intensity. Detrital material input proxies (Si/Al, Ti/Al) indicate that the low Si/Al and Ti/Al ratios reflect a low material input providing an increasing organic matter accumulation in the Middle Miocene. However, paleoproductivity proxies (P/Ti, Ba/Al) show the organic matter enrichment is not restrained by water column productivity, as indicated by a weak correlation between TOC and productivity index. In addition, paleosalinity index (Sr/Ba) and redox indicators (V/Cr, V/Sc U/Th and Mo/Al) indicate that the sediments were deposited in a brackish environment with dysoxic to suboxic conditions and might be the main control in the enrichment of organic matter in the study area. Thus, the detrital material influx and paleoredox conditions controlled organic accumulation and source characteristics the Miocene sedimentary sequence of the Kutai Basin.Keywords: Chemostratigraphy, Kutai Basin, paleoenvironment, source rocks.
Co-Authors Akhmad Khahlil Gibran Aries Kusworo Aris Kusworo Asep Kurnia Permana Asep Kurnia Permana Baharuddin Baharuddin Eko Bayu Purwasatriya Hermes Panggabean L Fauziely Moh. Heri Hermiyanto Zajuli Sigit Maryanto Y A. Sendjaja