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All Journal Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Edi Slameto, Edi
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Education Energy Engineering Environmental Science

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STRATIGRAFI DAN SEDIMENTOLOGI ENDAPAN DATARAN PASANG-SURUT DI KALI TULIS, BANJARNEGARA Bachri, Syaiful; Slameto, Edi; Nurdiana, Indra
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 3 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The tidal flat deposits of the Merawu Formation in Kali Tulis belongs to the Merawu Formation, and can be divided into two members, i.e. the lower part or the mudstone member, and the upper part or the sandstone member, with gradational contact between the two members. The lower parts is dominated by mudstone which is mostly deposited in mud flat environment, while the upper part is dominated by sandstone which is dominantly deposited in sand flat environment. Some sandstone layers in the lower part contains foraminifers of Early – Middle Miocene age, whereas the occurrence of fossils in the upper part has not been known so far. Sedimentary structures found in the two members include herring-bone structure, small scaled slump, parallel and cross laminations, bioturbation, flute cast, bed load, and fining upwards grain size. The sandstone of the two members contains volcanic rock fragments abundantly, suggesting that the provenance is volcanic rock in volcanic arc.Keywords: sand flat, mud flat, herring bone structure, Merawu Formation
KANDUNGAN MATERIAL ORGANIK DAN SIFAT GEOKIMIA BATULEMPUNG PALEOGEN DAN NEOGEN DI CEKUNGAN SERAYU: Suatu Analisis Potensi Batuan Induk Hidrokarbon Slameto, Edi; Panggabean, Hermes; Bachri, Syaiful
Jurnal Geologi dan Sumberdaya Mineral Vol 20, No 4 (2010): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Geochemistry analysis (Rock-Eval pyrolisis, GC and GC-MS) on 2 (two) samples of Paleogene claystone, 3 (three) samples Neogene claystone, and 1 (one) oil seepage sample in Serayu Basin. The result of analysis shows that TOC of the Neogene claystone is higher than the Paleogene claystone. One sample of the Neogene claystone is able to be classified as source rock for oil and gas, whilst the others including the Paleogene claystone show as gas source rock. The geochemistry composition of Neogene claystone at Gintung River indicates that the oil seepage can be correlated with the rocks. The kerogen type of all claystone in the area ranges from Type III (terrestrial) to Type II (mixing terrestrial and marine).Keywords: hydrocarbon source rock, Rock-Eval pyrolisis, gas chromatography, gas chromatography-mass spectrometry, Serayu Basin
Co-Authors Hermes Panggabean Indra Nurdiana, Indra Syaiful Bachri