SOURCE ROCK POTENTIAL AND DEPOSITIONAL ENVIRONMENT OF OIL SHALE BASED ON PETROGRAPHY CHARACTERISTICS AND ORGANIC GEOCHEMISTRY IN KAPUR IX, WEST SUMATRA

Wiryadi Rizkiputra Rahmola, Ildrem Syafri, Winantris Winantris, Nana Suwarna

Abstract


The research area were located in the Kapur IX District, Lima Puluh Kota Regency, West Sumatra
Province. The research focused on Kapur IX Intramontane Sub-basin filled with oil shale. The
analysis was carried out on shale samples of the Kapur IX Intramontane Sub-basin collected from
outcrops to evaluate the source rock characteristics, including type of oil shale, depositional
environment, and dispersed organic matter. Geochemical analyses include total organic carbon
(TOC) and Rock-Eval Pyrolysis, while organic petrographic analysis comprises organic material
composition and vitrinite reflectance. Based on the results the oil shale of the study area has low
to excellent quality and richness, type II and II kerogen content, with the maturity level of late
immature to early mature. The dominant lamalginite maceral content in the sample tends to
indicate the oil shale in the research area is a Green River type. The liptinite maceral group is
directly proportional to the value of Potential Yield (PY) indicating that the maceral group, especially
alginite plays a role in producing hydrocarbons in the oil shale of the study area. Based on the
composition of maceral data, the depositional environment of oil shale of the Kapur IX
Intramontane Sub-basin is interpreted to be a lacustrine environment with brackish water
condition.


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DOI: https://doi.org/10.24198/gsag.v2i6.20868

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