A comparative study of petroleum systems in the Sirikit and Wichian Buri Oil Fields | |
| Author | Warittha Sanglee |
| Call Number | AIT Thesis no.GE-17-15 |
| Subject(s) | Petroleum--Thailand--Wichian Buri Oil fields--Thailand--Wichian Buri Oil fields--Thailand--Sirikit |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Geotechnical and Earth Resources Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-17-15 |
| Abstract | Wichian Buri and Sirikit are two onshore oil fields in Tertiary basins that located in the Central part of Thailand. The petroleum system of Wichian Buri is very special because in this basin the igneous rocks had intruded in the immature shale layers, making them become more mature to generate HC at a relative shallow depth, and with the passing time the intrusions were fractured, forming a new type of fractured reservoir. The objective of this study is to perform a comparative study of petroleum systems between two basins in terms of petroleum system elements and petrophysical parameters based on well logging interpretation and calculation volume of HC generated and expelled in the source rocks zone. Data of three wells name WB-01, WB-02, and SR-01 are kindly support by ECO Orient Energy and PTTEP (Thailand) Limited. In this study, well logging analysis was performed to find a lithological zonation. In WB-01, three clastic reservoirs were identified by low gamma ray (30 – 60 API). These reservoirs have hydrocarbon saturation around 0.52. In WB-02, five fracture igneous reservoirs were identified by significant low gamma ray (20 – 30 API) and high density. These reservoirs have hydrocarbon saturation around 0.40. For SR-01, three clastic reservoirs were identified by low gamma ray (50 – 60 API). These reservoirs have hydrocarbon saturation around 0.75. TOC also could be successfully determined based on ΔlogR technique for WB-01. The results showed that TOC of source rocks are around 1.02 %wt. In WB-02, the TOC of source rocks are around 1.84 %wt. compared to WB-01 shale layers with the same range of depth that is 1,000 – 1,800 mMD. TOC has different value due to temperature in WB-02 is higher than WB-01. For SR-01, TOC of source rocks are around 2.71 %wt. Level of maturity (LOM) in source rock from well WB-01, WB-02 and SR-01 are about 9 – 12. Interpreting based on Crain’s Petrophysical Handbook, LOM of peak oil shale is 10.5. Thus, shale zones from three wells are mainly provide oil. The petroleum system modeling of the two basins also was performed. The hydrogen index (HI) of the source rock are 1.6, 26, and 100 mgHC/gTOC. The HI results from PetroMod were calculated for volume of hydrocarbon generation from Schmoker (1994)’s equation and got the results are 1.13, 6.55, and 594.36 MMbbl in WB-01, WB-02 and SR-01 respectively. In the assessment of petroleum resources in place, hydrocarbon expelled also calculated from Claypool et al., (2002)’s equation. Volume of hydrocarbon expelled in WB-01 is 117.73 MMbbl while WB-02 hydrocarbon expelled 136.08 MMbbl. In SR-01, hydrocarbon expelled 2,204.60 MMbbl. From analysis, the igneous intrusion has the most affect to making shale source rock layers becomes more mature to generate HC especially in the relative shallow depth. |
| Year | 2017 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-17-15 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical Engineering (GE) |
| Chairperson(s) | Pham Huy Giao; |
| Examination Committee(s) | Noppadol Phien-wej;Chao, Kuo-Chieh ; |
| Scholarship Donor(s) | Royal Thai Government Fellowship; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2017 |