Well log interpretation of the new block of Sansai Oil Field | |
| Author | Vachiradech Vechbunyongratana |
| Call Number | AIT Thesis no.GE-14-12 |
| Subject(s) | Oil well logging--Thailand--Fang Basin Oil well logging Sansai Oil Field (Thailand) |
| Note | A thesis submitted in partial fulfillment of the requirements for thedegreeof Master of Engineering 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-14-12 |
| Abstract | Fang basin has been producing oil for long time, mainly from central Fang. Recently the exploration and production activities have been expanded to new areas, including the South Fang sub-basin. Thus, there is a need to reanalyze the old well log data. The first work in this study was to collect core and well logging data from two wells,well FA-SS-55-15 and FA-SS-57-16 in the newblock of Sansai oil field. Well FA-SS-55-15 was abandoned in 2013 due to low production and well FA-SS-57-16 is producing. The log data includeSP, LLD, DT(paper logs), and GR, RHOB and PHIN(Digital files). But the PHIN tool was broken for both wells. Therefore, PHIN data could not be used. For some zones, there are no well log data such as DT andRHOB logs due to the broken tool. For example, there is no DT for well FA-SS-57-16. ThusANN methodwas used to reconstruct DT log, and the resultswere compared with DTcalculatedfrom Log response equation,whichindicated that theresultsby both methodsare not much different. After digitizing data, the lithological zoning was done for both wells by GR cutoff, SP and RHOB. For well FA-SS-55-15 and FA-SS-57-16, there are 7 and 8 sand zones respectively. After that well log analysis was carried out using GR, SP, RHOB, DT, LLD data. Well correlation was attempted for the wells in this study and those previously analyzed byParkpum, 2010 and Charinrut, 2014the correlation could not be done for Pongsaikham oil well because itis 6.5 km far from Sansai oil field. For well FA-SS-37-05, 2010 was reanalyzed. Well log analysispreviously indicatedthat an oil zone, whichwas perforated for producing oil,butit turned out that this zoneproduced98.5% water cutoff in 10 days. After that, there wasonly water. Reanalysis was done to find out the reason and take it into account forwell FA-SS-55-15 the best reservoir is supposed to be at 2957-3013ftand for wellFA-SS-57-16the best reservoir is found at 4103-4113ftas the permeability, porosity in these zones higher and the water saturation is lower than other zones. |
| Year | 2015 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-14-12 |
| 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;Pinan Dawkrajai; |
| Scholarship Donor(s) | Royal Thai Government Fellowship; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2014 |