INTEGRATION OF BASIN MODELING CONSIDERATIONS WITHWIRELINE LOGGING

摘要

There is a trend of exploiting reservoirs of increasingcomplexity in higher cost settings. This dual challengemandates improved efficiencies especially withapplication of new technology for all phases of projectdevelopment. Moreover, particular work flows utilizedin the past are becoming increasingly inadequate toaddress current and anticipated challenges;understanding the reservoir remains the biggest hurdlefor efficient oil production. Our objective here is tooptimize utilization of wireline sampling and testingtools (WSTs) using new work flows and exploiting newtechnology, particularly Downhole Fluid Analysis(DFA). At the outset, fluid heterogeneities arerecognized as potential contributors to productionconcerns. Nonequilibrium profiles of reservoir fluidhave previously been recorded for a variety ofreservoirs. In particular, important productionparameters for the fluids are seen to vary widely and innonsystematic ways. Distinct fluid models in basins arediscussed that can account for these complexhydrocarbon columns. The WST job is designed toreduce uncertainty regarding these controlling factorsand optimally enable determination of the primary fluidphysics affecting production. This work flow ultimatelyinvolves prediction and testing of DFA log data;potential errors in reservoir understanding areencountered early in the project prior to expenditure ofhuge resources. Most importantly, real time analysis oflog data by senior technologists allows for new WSTmeasurements to resolve contradictions betweenpredicted vs. acquired log data as opposed to resolution(only) by computer simulation. Case studies arediscussed where fluid data successfully predicted DFAdata in subsequent wells confirming the understandingof the reservoir compartments and contained fluids.