Petroleum system modeling and formation evaluation of clastic reservoir in Phetchabun Basin | |
| Author | Passapong Choomjai |
| Call Number | AIT Thesis no.GE-14-14 |
| Subject(s) | Petroleum--Geology--Thailand Petroleum--Thailand--Phetchabun Basin Phetchabun Basin (Thailand) |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Geotechnical and Earth Resources Engineering with Area of Specialization in Geosystem Exploration and Petroleum Geoengineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-14-14 |
| Abstract | Phetchabun basin is an onshore sedimentary basin. Exploration shows that hydrocarbon exists in its clastic and fractured volcanic reservoirs. The objective of this study is to perform formation evaluation of the clastic reservoir and 1D petroleum system modeling for Phetchabun basin. Data of three wells named Y1, Y2 and Y3 were kindly supported by ECO Orient Energy (Thailand) Limited. Among these data sets, the sonic log from well Y1 was missing. The ANN was performed to reconstruct the curve. After the well data were checked, the well log analysis was carried out for each well. The well Y1 has only one reservoir, which is shaly sandstone with thickness of 6.4 m and depth of 825.6 to 832.0 mMD. Its effective porosity is 0.28 and the permeability is 17.8 mD. The water saturation by Archie model is 0.79 and the average water saturation by the shaly sand models is 0.67. Eight reservoir zones were identified in the well Y2 including two igneous reservoirs. The six clastic reservoirs are shaly sandstone. Their thicknesses are in the range from 5 m to 11.5 m. Their effective porosity values are in the range of 0.07 to 0.23 with average value of 0.15. Their permeability values are in the range of 0.58 to 11.04 mD with average value of 3.12 mD. The Archie's water saturations fall between 0.51 and 0.98 with average value of 0.85. The average water saturation by shaly sand model is 0.69. The well Y3 contains two hydrocarbon reservoirs. They are clayey sandstone reservoirs with the thickness of 8.0 m starting from 1101.7 to 1109.7 mMD and 6.1 m starting from 1253.7 to 1259.8 mMD. Their effective porosity and permeability values are 0.19 and 0.14, and 70.98 and 11.35 mD respectively. The Archie's water saturations are 0.74 and 0.87. The average water saturation by the shaly sand model of this well is 0.63. The simple poro - perm relationship was investigated. The plots between calculated permeability and total porosity as well as calculated permeability and effective porosity of reservoir zones in the three well have been done. The representative relationship of total porosity - permeability of well Y1, Y2 and Y3 are k = 10 14.39 φ - 1.69, k = 10 12.99 φ - 2.33 and k = 10 25.85 φ - 3.09 respectively while the representative relationship of effective porosity - permeability of well Y1, Y2 and Y3 are k = 10 13.37 φ +4.41, k = 10 11.79 φ - 1.41 and k = 10 16.28 φ +0.16 consecutively. Stratigraphic correlation was performed based on characteristics of the well log responses, log derived petrophysical properties and stratigraphic columns in Phetchabun basin. Groups of hydrocarbon reservoirs in the Y1, Y2 and Y3 are likely to be Wichian Buri Unit III. The shale layers below all reservoir zones can be considered as the Wichian Buri Unit IV which represents a source rock of the basin. Base on the geological data collected as well as the results from well log analysis, the petroleum system modeling of the Phechabun basin reveals that the basin was formed from rifting process commenced in late Oligocene. The rifting ended in late Miocene and the post rift started. Heat flow increased exponentially from 34.84 to 49.78 mW/m 2 during rifting. The temperature gradient derived from PetroMod is 3.0 o C/100 m. The Roof the source rock is 0.46%. The hydrogen index of the source rock is 2.19 mgHC/gTOC and the calculated hydrocarbon volume derived from the HI at 100% bulk volume is 22.5 MMMBBL. The 1DPetroMod simulation shows that the mass of hydrocarbon generated up to present day is 0.04 MTons |
| Year | 2015 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-14-14 |
| 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;Pinan Dawkrajai; |
| Scholarship Donor(s) | Thailand (HM King); |
| Degree | Thesis (M. Sc.) - Asian Institute of Technology, 2014 |