Integration of 3D-Seismic With Reservoir Simulation for Reservoir Characterization and Assessment of Alternative Exploitation Schemes of Field Development - A Case Study

摘要

This paper deals with a study where integration of 3D-seismicrnsurvey and reservoir simulation has aided in reservoirrncharacterization which in turn have led to better and effectivernimplementation of reservoir development schemes. Shalmari,rnone of the major oilfields in Assam-Arakan geologicalrnprovince of North-East India was discovered in 1986 and therninitial field development was carried out on the basis of thenrnavailable 2D-seismic data. During the course of initial fieldrndevelopment, the area of major concern was the rapid declinernof reservoir pressure. A detailed simulation study was carriedrnout in 1994 for assessment of the pressure maintenancernrequirements and field development.rnA 3D-seismic survey was carried out in 1994 in this area tornobtain additional information on the reservoir geometry andrnstructural configuration. The processing and interpretation ofrn3D-seismic data resulted in identification of additional faultsrnthus bringing about a change in the structural configuration ofrnthe reservoir. The presence of identified faults wasrncorroborated by pressure transient surveys. This necessitatedrnin carrying out of another detailed reservoir simulation studyrnby building up a geological model based on 3D-seismic data.rnThe basic objective of the study was to carry out a morernaccurate and reliable reservoir characterization apart fromrnidentifying the prominent direction of aquifer support and re-assessmentrnof the hitherto planned reservoir developmentrnscheme including ongoing pressure maintenance scheme. Thernresults of the study carried out in 1997 also indicated possiblernincrease in gross ultimate recovery as a result of waterrnflooding. The financial analysis of the development schemesrnenvisaged in this study was also found to be attractive.rnCross-discipline integration of data expertise and study hasrnhelped in accurate mapping of the minor faults and hasrnprovided a better insight into fault transmissibilities in thernfluid flow simulation.