Sedimentary Facies And Geological Model Research Of Chang8Reservoir Group In Zhiluo Oil Field In Erdos Basin

Atfer years of exploration and development in the zhiluo oil field，oil production ofsingle well level is low,production decline rapid and content water high. There is an urgentneed to study oil and gas accumulation condition and distribution in Chang8reservoirgroup,then evaluate the exploration prospect and predict favorable area.Comprehensive research the clastic rock color and ancient biological markers、grainstructure and particle size analysis、sedimentary structure feature、sedimentary rhythmfeature、well logging facies in this area, we can consider sedimentary facies is delta rfontsubfacies in delta dcposit,further divided into sedimentary micro facies as underwaterdistributary channel、underwater natural levee、subsea interdistributary bay、estuary dam、distal bar、sheet sand.Use three kinds of methods as stochastic modeling> deterministic modeling、interactivemodeling to establish sedimentary facies modcl,atfer contrast to cach other，we consider thatinteractive modeling for sedimentary facies models is best, using stochastic modeling、facics-controlled modeling、trend surface constraint modeling of these three methods toestablish porosity model, atfer compared with each other,we consider that porosity modelmade by constraint method of trend surface is best.Integrated research the geology and geological model efatures,we find that the mostf1avorable area2of changS oil group is the zi9well area, the most favorable area of chang8oilgroup is the zi8and zilO well area.In addition model roughening effect comparatively well.