One-dimensional petroleum system modelling of the South Fang Basin, Northern Thailand. | |
| Author | Kritsana Doungnoi. |
| Call Number | AIT Thesis no.GE-10-11 |
| Subject(s) | Oil fields--South Fang Basin (Thailand) Petroleum geology--South Fang Basin (Thailand) |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Geosystem Exploration and Petroleum Geoenineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-10-11 |
| Abstract | The hydrocarbon exploration in the Fang basin, Northern Thailand, started in I921. The total production from the Fang basin is approximately 9 MMBbl since early I960 to present day. Although the field has been produced for many years, detailed studies on basin modeling and petroleum system have not been done for this basin. This study is aimed at estimating the total volume of hydrocarbons generated in the South Fang basin using two approaches i.e., I -D petroleum system modeling by PetroMod software and assessment of petroleum resources in place by analytical methods (Schmoker, I994; Claypool et al., 2002). A total of 8 modeling scenarios with PetroMod were performed, varying various input parameters such as erosion period and thickness, TOC, HI, input of basement, and heat flow. The obtained results of ID modeling indicated that the higher values of TOC and HI the higher amount of HC could be generated. The study found that incorporation of the basement in the input file could affect significantly the HC generation as geothermal gradient becomes steeper than in the case without basement. It was also found that the higher rate of erosion resulted in the higher vitrinite reflectance. Temperature and heat flow have an influence on estimation of HC maturation, generation and expulsion too. As one of the main results from ID modeling, with geothermal gradient of 0.027°C/m, heat flow of 56.8I mW/m2 HC started to be generated in Middle Miocene (I5.9 Ma) with HI of O. I5 mgHC/gTOC. A total of HC volume generated is estimated about 6.02 MMBbl at present day. Assessment of petroleum resources in place was done using two methods by Schmoker (1994) and Claypool et al. (2002), respectively. Schmoker (1994)'s method gave 4.50 BBbl of petroleum generated, while that by Claypool et al. (2002) gave I .96 BBbl of petroleum expelled. By applying the expulsion efficiency proposed by Claypool et al. (2002) to the volume of petroleum generated as calculated by Schmoker (1994)'s method, petroleum expulsion was found as 4.32 BBbl for this most conservative case. As conclusion, ID petroleum system modeling and an assessments of petroleum resources in place could be conducted for the South Fang basin. From PetroMod basin modeling, it was found that HC could be generated in this basin starting form Middle Miocene. The calculated volumes of HC generation were still different between the numerical and analytical approaches, however it definitely indicated that the South Fang basin has some potential and can be worth explored. This study, like any other basin modeling work, has uncertainties due to limited data, especially those of geochemical data. It is recommended that 2-D and 3-D petroleum system modeling works be done for the whole basin in future studies. |
| Year | 2010 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-10-11 |
| 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;Bergado, Dennes T.;Srihiran, Colonel Sutas; |
| Scholarship Donor(s) | H.M. King Scholarship.; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2011 |