Application of stochastic inversion and crossplot in the detection of a Thin Gas Sand in Nam Con Son Basin, Vietnam | |
| Author | Pham Tien Cuong |
| Call Number | AIT Thesis no.GE-17-11 |
| Subject(s) | Stochastic analysis--Vietnam--Nam Con Son Basin Thin gas sand--Vietnam--Nam Con Son Basin |
| Note | A thesis submitted in partial fulfillment of the requirements for thedegree of Master of Science inGeotechnical and Earth Resources Engineeringwith Area of specialization in Geosystem Exploration and Petroleum Geoengineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-17-11 |
| Abstract | Basement reservoirs account for 80% of oil reserves and production of Vietnam. The decline and depletion rates of oil production along with the continuously increasing energy demand lead to push up the exploration activities. The task to find out additional reservoirs is a need.Athin gas sand wasencountered by two wells in Upper Miocene in Nam Con Son basin has2.5 m of thickness which is below the limitation of seismic resolution. Prior studies in this area have not been able to delineate thin layers based on deterministic seismic inversion approach due to poor vertical resolution. Here we present a combination of stochastic inversion and rock physics to capture a thin gas sand body. The vertical and horizonal variograms are one of the most important input parameters for stochastic inversion and kriging-based estimation. At early stage of exploration, the horizonal variogram is always difficult to determine because lack of well data. In this study, horizonal spatial continuity and variability were investigated from relative impedance map generated from fast-track colored inversion. The result of feasible analysis from well log suggest that P-Impedance versus Vp/Vs effectively discriminate gas sand from background when gas sand and shale have almost the same acoustic impedance value. The mean P-Impedance of 200 realizations shows a superior resolution enable separate thin layers. Using the crossplot of inverted elastic impedances and rock physicsprovide an aid tool reduce the risk in interpretation of thin gas sand. |
| Year | 2017 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-17-11 |
| 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) | Chao, Kuo-Chieh;Noppadol Phien-wej; |
| Scholarship Donor(s) | Asian Institute of Technology Fellowship; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2018 |