Shale gas characterization based on geochemical and geomechanical to determine hydrocarbon potential at Tamiang Deep, North Sumatra Basin

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Abstract

Shale gas remains one of the trending topics in the petroleum industry. Indonesia has a great potential shale gas resource, and both government and oil companies have promoted the development of shale gas. Geochemical and geomechanical parameters are important aspects for exploring new shale gas play, and it provides significant information to optimize production plan and stimulation design. However, there is limited research on correlations inter petrophysical parameters for shale gas reservoirs. The study area is located on the southeast border of the North Sumatra Basin. Lower Baong Formation shales are believed to be favorable shale gas targets with a dominant shale lithology. The Baong Formation occurs at depths from 1.465 m to 3.224 m in the study area with the thick mudstone, dominated by gray, brown to black calcareous shale rich in foraminifera, indicating a marine environment. The Baong Formation age varies from the Lower Miocene to Middle Miocene can split into three vertical units: Upper Baong, Middle Baong, and the dominantly shale Lower Baong. This research is aimed to characterize and identify shale hydrocarbon by examining the Total Organic Carbon (TOC), Brittleness Index (BI), Hydrogen Index (HI) and maturity parameters. Various methods were used to analyze these parameters, including geochemistry, mineralogy, petrophysics, cross plotting, and seismic interpretation. Our analysis on rock evaluation and petrographic data shows that TOC varies between 0,1% to 3,7%, vitrinite reflectance of 0.4 - 0.7%, HI varies from 31 - 171, and maximum temperature (Tmax) from 444 - 465°C. TOC resulted in a poor to good category. A cross plot of the HI and Tmax in the van Krevelen diagram revealed the dominant kerogen types as II and III. The kerogen is considered as early mature to mature. The brittleness index of the shale formation of the research area is categorized in less brittle to brittle. The prospective areas for the development of shale hydrocarbon are the sequences of MFS-2, MFS-3, SB-2 and SB-3 with the potential of shale oil.

Original languageEnglish
Title of host publicationProceedings of the 3rd International Symposium on Current Progress in Mathematics and Sciences 2017, ISCPMS 2017
EditorsRatna Yuniati, Terry Mart, Ivandini T. Anggraningrum, Djoko Triyono, Kiki A. Sugeng
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735417410
DOIs
Publication statusPublished - 22 Oct 2018
Event3rd International Symposium on Current Progress in Mathematics and Sciences 2017, ISCPMS 2017 - Bali, Indonesia
Duration: 26 Jul 201727 Jul 2017

Publication series

NameAIP Conference Proceedings
Volume2023
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference3rd International Symposium on Current Progress in Mathematics and Sciences 2017, ISCPMS 2017
CountryIndonesia
CityBali
Period26/07/1727/07/17

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