Facies analysis with reference to distribution of the 50-Sand, Jasmine field, Gulf of Thailand | |
| Author | Nguyen Thi Thu Thao |
| Call Number | AIT Thesis no.GE-11-12 |
| Subject(s) | Oil well logging--Thailand, Gulf of Geophysical well logging--Thailand, Gulf of |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Geosystem Exploration and Petroleum Geoengineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-11-12 |
| Abstract | This study is conducted with collaboration and support from Pear l Oil Thailand. The study deals with the 50 - sand reservoir in Jasmine field which is the deepest producing reservoir within the field. The log characteristics of the 50 - sand reservoir seem s to differ from those of overlying oil reservoirs, exhibiting thin beds of 10 – 15 ft thick with increasing porosity commonly towards the tops of the sandstones. On the other hand the o verlying reservoirs are dom inantly fluvial, relatively thick from 20 ft to 100 ft and exhibit fining - upwards pro files . The study integrate d geological and geophysical data to analyze the depositional environments of the 50 - sand of Jasmine field. The study utilized visual core description and well logs interpretation (geological) with Kingdom (SMT) being the interpretation platforms . Beside well logs and cores, seismic data were used to guide well correlation and evaluation reservoir conn ectivity . The 50 - sand is interpreted having 3 main zones deposited in different depositional environments with different reservoir quality. The deepest zone (zone A) has the thickest sands tones with very good porosity and permeability (thousands mD) wa s deposited in distal alluvial fan. These sands tones we re deposited in early stage of a trangressive system tract which represents the water level from stand still to slow rise. At this stage, multi - story sandstone bodies fill ed the valleys give a high net - to - gross ratio. Right above zone A is zone B located with less sand stone . Sand stone in zone B also has less porosity and much smaller permeability (several mD) comparing to that of zone A. The reduced porosity and permeability of the se sands tones are believed due to the authigenic clay. These sands tones we re deposited in a later stage of trangressive system tra ct. At this stage the gradient wa s reduced resulting in less sediment supply and the rivers start meandering. The shallowest zone in 50 - sand is Zone C . Zone C sands are believed to be deposited in a mo uth bar or sand bar in delta front to distributary channel in delta plain of a fan delta. Sands tone in the delta front has poor porosity and permeability (several mD) due to strong bioturbation while sands tones of distributary channel in the delta plain give better porosity and permeability (thousand mD). Zone C develops with more and more shale to the top, the water level believed to be highest at the top of zone C . Sand s tones in zone C deposited in a high stand system tract with sediments are outbuildi ng laterally or progradation. |
| Year | 2012 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-11-12 |
| 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;Oglesby, Chris; |
| Scholarship Donor(s) | Asian Institute of Technology Fellowship; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2011 |