Formation evaluation of carbonate reservoirs : a review of well log analysis procedures and application for a case study in the SE Asia | |
| Author | Varis Siripunthana |
| Call Number | AIT Thesis no.GE-14-18 |
| Subject(s) | Oil well logging--South East Asia--Case studies Carbonate reservoirs--Evaluation--Case studies |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Mast er of Engineer in Geotechnical and Earth Resources Engineering wi th A rea of Specialization in Geosystem Exploration and Petroleum Geoengineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-14-18 |
| Abstract | The carbonate reservoirs become more and more important targets of HC E&P in the SE Asia. However, the practical well log analyst often enc ounters the difficulties in WL analysis , i.e., the problem in estimating the cementation exponent ‘m’ and porosity based upon pore type distribution , which have the greatly effect to the water saturation . A good standard of interpretation for this type o f reservoir is therefore needed . The objectives of this research are aimed to s tudy on the differences of WL interpretation between clastic s and carbonate s. Illustrate d the procedure of well log gi ng interpretation from conventional log data at a study site, Vietnam and further propose the petrophysical models for carbonates. Regarding to gamma ray, neutron - density cross plot and photoelectric log s indicated that the formations are composed of limestone formation in zone 2 & 4 and dolostone in zone 1 & 3 . Four porosity methods which are thermal neutron porosity (TNPH), porosity derived from shallow resistivity (PHIRs), density porosity (PHID) , and neutron - density porosity (PHIND) wer e used as total porosity for this interpretation. Porosity profile showed t hat there is a reduction in porosity at depth around 2,712.00 m . Porosity appears to be better above this depth . C ombination of pore type s distribution , hydrocarbon moveabl e , and log responses indicated three production zones which consistent with the re sult of porosity coefficient from dual porosity system (Tiab & Donaldson, 2004). C ementation exponent ‘m’ in low porosity (Borai, 1987) and Focke & Munn (1987) models were closely matched in low porosity ( 5%). The estimated result from Archie’s water sat uration for TNPH, PHIRs, PHID, and PHIND as total porosity where hydrocarbon is moveable are 22%, 19%, 17%, and 16 % , respectively. |
| Year | 2015 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-14-18 |
| 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 Phienwej;Pinan Dawkrajai; |
| Scholarship Donor(s) | Royal Thai Government;Asian Institute of Technology Fellowship; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2015 |