Geochemical Method for Source Rock Analysis in JT-1 Well, Central Sumatera Basin
| Main Authors: | Datu, Cecilia Jatu Praba, Adventino, Adventino |
|---|---|
| Format: | Article PeerReviewed application/pdf |
| Bahasa: | eng |
| Terbitan: |
Departemen Teknik Geologi
, 2019
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/275260/1/a026.pdf https://repository.ugm.ac.id/275260/ |
Daftar Isi:
- The research is located in JT-1 well, Central Sumatra Basin. There are 3 formations at JT-1 well, Sihapas Formation, Telisa Formation, and Petani Formation. The study is aimed to determine the potential hydrocarbon sources of quality, quantity, maturity, and hydrocarbon potential depth through geochemical method analysis. Rock-eval pyrolysis used to identify the type and maturity of organic matter and petroleum potential in sediments. The depth of the potential hydrocarbon source can be determined afterwards. The results of the analysis on geochemical data show that the value of Total Organic Carbon (TOC) in the JT-1 well has poor to good quality with kerogen II type (oil & gas prone), and kerogen III type (gas-prone). The Sihapas Formation has high TOC value (0.5 – 1.5%) which is categorized as mature (436 – 443 oC). The value of Hydrogen Index (HI) could show the kerogen type. Sihapas Formation has HI value of 117 - 724 mgHC/g TOC (gas to oil-prone). While some data of Telisa Formation and all of Petani Formation categorized to be immature. The TOC value of the Telisa Formation ranges from 0.48 - 1.49% and Petani Formation 0.57 - 0.7%. Sihapas Formation (4150-4939 feet depth) in JT-1 well has potential as a hydrocarbon source rock with poor to fair organic richness and mature maturity. It is suitable with the lithology data that consists of organic-rich sandstone with a thin layer of coal.