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All Journal Scientific Contribution Oil and Gas LEMBARAN PUBLIKASI MINYAK DAN GAS BUMI
Desi Yensusnimar
Unknown Affiliation
Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Energy Engineering Environmental Science

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Heavy Oil Seapage Characteristic in Cipari Area, Banyumas Central Java Jonathan Setyoko Hadimuljono; Desi Yensusnimar
Scientific Contributions Oil and Gas Vol. 44 No. 3 (2021): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

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Oil seepage in Cipari, Banyumas, Central Java, has long been known. Although, Its occurrence had been reported in several publications, it's properties and characteristic, have not been explained in detail. Therefore, through field geology observation and laboratory analysis, this paper attempts to describe the oil seep characteristic, possible source rock origin, and its relationship with geological features in the surrounding area. Picnometer analysis resulted that this oil seep can be classified as heavy oil with 12n API Gravity. Gas Chromatography (GC) & Gas Chromatography Mass Spectometry (GCMS) analysis revealed that Cipari oil seep is heavily biodegraded. Possible source rock of the oil seep was interpreted based on bicadinane and oleanane biomarkers, which indicated that source was deposited in fluvio-deltaic/transitional environment. Based on regional geology reference of Banyumas sub-Basin, it is inferred that the source rocks possibly shale or claystone of Paleogene sediment which was thermally mature, and deposited in transition to marine environment. Deep seated fault that extent from Majenang to Karangbolong areas is probably the main migration pathway of the oil seepage from the kitchen or deep reservoir to the surface. The Cipari anticline outcrop, which associated with faults and fractures, become the place where the oil seep occurs in the surface. Heavy biodegradation of the oil seep may possibly be accelerated by hydrothermal system during migration from the reservoir/kitchen area to the surface.
Geochemical Properties of Heavy Oil in Central Sumatra Basin Desi Yensusnimar
Scientific Contributions Oil and Gas Vol. 44 No. 3 (2021): SCOG
Publisher : Testing Center for Oil and Gas LEMIGAS

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Heavyoilcommonly occurs due to biodegradation, whichmade the lighter fractiondisappears and then leaves the heavier fraction. Heavy oil is characterized by asphaltic, solid, and viscous because it contains asphalthene. Chemically, heavy oils contain fewer hydrogen atoms than light oils. Bulk properties ofheavy oil in addition to having a specific gravity of less than 25° API gravity, high viscosity, and often contain (concentration) of heavy metals (vanadium, nickel) which is higher than light oil (normal oil). Geochemical analysis based on the gas chromatography (GC) chromatogram of heavy oil in the Central Sumatra Basin shows a different pattern. The chromatogram pattern eliminates the light molecular fractions of the compounds in biodegraded oil and tar sand/bitumen. According to their geochemical properties, there are 4 (four) types of heavy oil in the Central Sumatra Basin namely: Type l come from shallow reservoir, water wash, and full biodegradation/all alkane depleted); Type 2 come from shallow reservoir, meteoric water, and light biodegradation, only low molecular weight alkane depleted); Type 3 come from deep reservoir, vertical gravity segregation, decreased weight fraction, can be caused by oil conditions in thick reservoirs, covered by impermeable lithology and usually located on the edge of the field (flank). Type 4 which contains medium-heavy oil (27°API) and is difficult to produce.
REMBESAN MIGAS DI DAERAH TIMOR BARAT Jonathan S. Hadimuljono; Desi Yensusnimar; Ario B. Wicaksono; Suliantara
Lembaran Publikasi Minyak dan Gas Bumi Vol. 50 No. 3 (2016): LPMGB
Publisher : BBPMGB LEMIGAS

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Di daerah Timor Barat banyak dijumpai rembesan migas (hidrokarbon) yang pada umumnya berasosiasi dengan semburan lumpur atau mud volcano. Rembesan gas hidrokarbon dijumpai di setiap lokasi mud volcano, sedangkan rembesan minyak hanya pada lokasi mud volcano di bagian selatan Pulau Timor. Di beberapa tempat, kadang kadang rembesan minyak dan gas juga dijumpai pada sumur yang digali oleh penduduk untuk mencari air. Kandungan gas hidrokarbon dominan terdiri dari metana (CH4 ) dengan sedikit etana (C2 H6 ) dan kandungan nitrogen (N2 ) yang cukup tinggi yang menunjukkan karakter rembesan. Analisis Gas Chromatography (GC) pada rembesan minyak dalam lumpur menunjukkan kemungkinan minyak berasal dari batuan sedimen yang diendapkan pada lingkungan lacustrine atau transisi-laut.
Co-Authors Ario B. Wicaksono Jonathan S. Hadimuljono Jonathan Setyoko Hadimuljono Suliantara