3-D Reservoir Modelling of the Sirikit West Field, Phitsanulok Basin, Thailand

摘要

The Sirikit West Oil Field lies within the Phitsanulok Basin of Central Thailand. It is a satellite of the main Sirikit accumulation. Within the field, the Lan Krabu Formation represents the main reservoir interval. It is interpreted as fluvio-lacustrine in origin. The three major reservoir submembers (D, K1 and K2) are subdivided into 10 to 15 m thick parasequences bounded vertically by minor flooding surfaces. Each parasequence represents a progradational phase of mouthbar development which is terminated by a flooding event. A typical parasequence consists of facies progressing from open lacustrine claystoneto delta front including mouthbars and channel sands, to floodplain sands and shales. Compared to the Main Sirikit Field, the same stratigraphic intervals in Sirikit West are up to three times thicker. This indicates a strong element of differential subsidence across the major bounding fault between the two fields.