Reservoir Estimation And Remaining Oil Potentiality Distribution In Gongdatan Area, Ganguyi Oilfield

This paper studys the characteristics of the structure, sedimentary facies, reservoir, oildeposit and so on in the Gongdatan well-block，and calculates the reserves of Chang6units inthe study area，summarizes the distribution of remaining oil potential, with the guidance of thetheories of petroleum geology according to the research method of the combination of macrofacies and micro facies, using the data of logging, well logging, testing, etc.Chang6reservoir group mainly developed delta plain and delta front facies in the studyarea. The reservoir sand body is mainly underwater distributary channel, debouch bar, frontsheet sand, etc. The Chang6reservoir lithology is mainly feldspar fine sandstone and mediumgray fine-grained feldspar sandstone. Mineral composition in the feldspar, followed bycuttings and quartz. Total reservoir plane porosity is mainly in the3%~5%, an average of4.43%. The pore types are mainly residual inter granular pores, inter granular dissolved poreand intragranular dissolved pore take second place；The pore structure of the reservoir ismainly a combination of medium and small hole-medium and fine throat、small and fine pores-fine and subtle throat holes, micro-pore throat. The Chang6mainly developed lithologicreservoir under control of the lithology and property in the study area. Control factors oilreservoir enrichment is mainly influenced by the source rock, reservoir and cap layer, etc.Petroleum geological reserves of Chang6oil reservoir in the study area is106.74×104t,superimposed oil-bearing area is0.68km2. The maximum potential of the distribution of theremaining oil enrichment are Chang611and Chang613. The relatively large potential of thedistribution of the remaining oil enrichment are Chang622, Chang632and Chang64. Thesmaller potential of the distribution of the remaining oil enrichment are Chang621andChang631.