Geopressure prediction at a new exploration well site in Southwestern Cuu Long Basin, Vietnam | |
| Author | Trinh Ngoc Anh |
| Call Number | AIT RSPR no.PME-GEPG-09-03 |
| Subject(s) | Basins (Geology)--Cuu Long Basin (Vietnam) Geophysical well logging--Cuu Long Basin (Vietnam) |
| Note | A research study submitted in partial fulfillment of the requirements for the degree of Master of Engineering (Professional) in Geo-exploration and Petroleum Geoengineering |
| Publisher | Asian Institute of Technology |
| Series Statement | |
| Abstract | Prediction and evaluation of geopressured formations is critical to exploration, drilling, and production operations for hydrocarbon resources. Du ring the exploration period, pore pressure prediction helps in studying the hydrocarbon trap seals, mapping of hydrocarbon migration pathways, analyzing trap configurations, basin geometry, and providing corrections for basin modeling. Before drilling, pore pressure prediction is helpful to selection of an appropriate mud weight and optimization casing program, thereby enabling safe and economic drilling. There are very few published papers or reports on geopressure studies in the Cuu Long basin so far. Due to the data confidentiality, accessing data of the other blocks is extremely difficult. The prediction of geopressure is even more difficult for a newly setup JOC with a new exploration area has just been signed. This study deals with geopressures prediction base d on 3D seismic and well logs data for site located in the Southwestern pa rt of the Cuu Long basin, one of most important basin providing big amount of hydrocarbon for Vietnam. From the logging data of seven drilled wells, the normal compacted trends (NCT), overburden gradients (OBG) were built. After that, the pore pressures trends were predicted by using Eaton’s and Bower’s method with checking to available mud weight schedule (MW), pressure reading from the Drill Stem Tests (DST). These NCT, OBG, pore pressures were then utilized to analyze the available seismic velocity of the proposed well and build a pore pressure trend at th is site. The RMS seismic velocity at all well sites were converted to the interval velocity using Dix method and then calibrated to well for creating the normal compacted trend (NCT), overburden gradient (OBG). One arbitrary line cut through the well sites was also established to QC the velocity trend, NCT and OBG, supports building the pore pressure trend of the proposed well. The study results not only provided useful information for pre-drilling works of the planned well, but also for post- drill evaluation of the drilled wells in the study area. Due to the confidentiality, the detail of wells, seismic data and others sensitive information that were employed in this study would not be disclosed. |
| Year | 2009 |
| Corresponding Series Added Entry | |
| Type | Research Study Project Report (RSPR) |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical Engineering and Management (Master Engineering (Professional)) (PME - GEPG) |
| Chairperson(s) | Pham Huy Giao |
| Examination Committee(s) | Noppadol Phien-wej;Suwat Athichanagorn |
| Degree | Research (M. Eng.) - Asian Institute of Technology, 2009 |