GEOCHEMISTRY STUDY OF PETROLEUM WITH SOURCE ROCK AND BASIN MODELING IN MUARATEMBESI, JAMBI SUBBASIN

• Main Author: AKMAL (NIM: 22014334), NURULLAH
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/29840
• Institution: Institut Teknologi Bandung

<p align="justify">Jambi Subbasin is a substantial part of Tertiary sedimentary basin in South Sumatra which has several potential source rock formations such as Lahat Formation and Talangakar Formation. Therefore geochemical analysis is very interesting to be used as a tool of investigation to characterizing source rock in rock formation respectively. Source rock evaluation in this study is derived from M-1, M-2, R-1, R-2, B-2, B-3,<br /> and B-4 well. Source rock characterization is determined from several analysis such as organic material content and Rock-Eval pyrolysis. The TOC range in Muaraenim<br /> Formation is good to excellent (1.11-4.10%). The TOC range in Airbenakat Formation is poor to good (0.15-1.73%), composed by Type III of kerogen, and showing immature maturity (0.46% Ro). The TOC range in Gumai Formation is fair to good (0.5-1.12%), composed by Type II-III of kerogen, and showing immature to early mature maturity (0.39-0.67% Ro). The TOC range in Talangakar<br /> Formation is fair to excellent (0.5-4.1%), composed by Type II-III of kerogen, and showing early mature to late mature maturity (0.56-1.16% Ro). Based on organic material content and Rock-Eval pyrolysis, the source rock evaluation result showed Gumai Formation and Talangakar Formation as a potential source rock in this study, and later will be processed in gas chromatography and gas chromatography-mass spectrometry analyses to discover the origin of organic material and depositional environment of Talangakar and Gumai Formation rock extract samples. Talangakar Formation rock extract show a domination of high plants material, while Gumai Formation rock extract is composed by marine-algal domination. Talangakar Formation trend to be deposited<br /> in terrestrial environment if compared to Gumai Formation. Based on gas chromatography and gas chromatography-mass spectrometry analyses, the oil sample in B-2 well at 1061m depth and Gumai Formation rock extract samples are derived from similar source as both of them are composed from marine-algal component. The biomarker analysis show the oil sample in B-2 well<br /> at 1489m depth and Talangakar Formation rock extract samples are derived from similar source as both of them are composed from terrestrial component. 1D basin modeling is conducted in B-2, B-3, B-4, M-2, and R-1 well using several parameters such as TOC, vitrinite reflectance, erosion thickness, and lithology composition from rock deposition respectively. Based on basin modeling result, Gumai Formation currently lied at early mature condition, while almost in all wells Talangakar Formation currently lied at early mature to peak mature condition.<p align="justify">