Research On Sedimentary Microfacies Of The Fuyang Oil-bearing Layers In G45-16 Test Area, Gaotaizi Oil Field

Fuyang oil-bearing layer's reservoirs is a major backup reserves resource for the fifth oil recovery factory of Daqing oil field.However,because of small scale of channel development,frequent facies changes,poor connectivity,small sequence thickness,and the low degree of geological knowledge,not accurate,according to defect above,in this paper,we carried out G45-16 test area researchment.Based on extensive collection of former data and information,combination with Lithology,core-drilling wells,logging,seismic data in G45-16 test area,and sedimentology,logging,structural geology,petroleum geology,as guides,Fuyang oil-bearing layer in this test area(mainly means Fâ… ,Fâ…¡,Fâ…¢andYâ… )is divided into small layers,and the sedimentary microfacies is carried out,the platform distribution characteristics of sedimentary microfacies of each formation is summarized. Through the research and analysis on G45-16 block and the others founded by now,the potential oil and gas reservoir types are determined.Reference for previous achievements,applying stratigraphic and sedimentologic theory,by combining sedimentary cycle correlation, hierarchical control and discriminating different sedimentary facies association[14], the four Reservoir Group in the research target was divided into twenty-four subbeds,and then subdivided into fifty-seven sedimentary units.Through the contrast of electric proper and rocks,the establishment of core geologicalfacies,logging facies analysis and facies model,the determination of sedimentary microfacies of wells and the analysis on platform distribution characteristics of sedimentary microfacies are emphasized.Through the research on this block and the others founded by now,analysis the distribution of the oil and gas,determine the accumulation models types of Fuyang and the connection between different microfacies,as well as the control factors of the favorable oil and gas accumulation block. The result of research shows the effective reservoir is the distributary channel above or below the water.