Fine Description Of Thin Sand In Sartu Oil Layer In Xingba West Area Of Daqing Oilfield And Control Of Remaining Oil Distribution

After fifty-two years of development,a considerable amount of oil and gas has been exploited in the Xingnan Development Zone,but there is still a lot of oil and gas stranded underground.Compared with the well-developed channel sand,most of the thin sand in the Saertu oil layer we studied in this study is still in its original state.The thickness of the sand body is thin,the average thickness is about 1 meter,and the degree of flooding is poor.An important potential layer in development.Under the guidance of high-precision sequence stratigraphy theory and fine sedimentology theory,the sedimentary time unit of the Saertu oil layer in the west block of Xingba District of Daqing Oilfield was divided and compared,and then established according to the characteristics of different thin sands Delta front subfacies,6 types of sedimentary microfacies,20 types of energy unit logging facies models.Based on the genetic type and combination characteristics of the thin sand,the thin sand bodies of the delta front facies of the Sa II and III reservoirs in Xingba area are divided into seven combination types:underwater distributary channel type,river-controlled thin-bed sand type,and river-controlled Wave-controlled transition type,wave-controlled sheet sand type,far sand dam type,coastal dam type,low-energy mud-bearing thin-bed sand type.And for the following underwater distributary channels,river-controlled thin-layer sand,river-controlled wave-controlled transitional type(river control is the main,wave control is secondary),river-controlled wave-controlled transitional type(wave control is the primary,river control is secondary),Typical wave-controlled sheet sand,far-sand dam type,outer dam edge,low-energy mud-bearing thin-bed sand type(mainly thin-bed sand),low-energy mud-bearing thin-bed sand type(mainly mud,very little thin-bed sand)9 Various types of sand bodies are dissected.On this basis,the different types of thin sand water flooded in the Saertu oil layer were analyzed,and the remaining oil types of the Saertu oil layer in the Daqing oil field were determined to include the remaining oil in the poor oil layer retention zone,the remaining oil with the relatively dominant porosity and permeability channel shielding,and the remaining oil in the Saertu oil layer in the Daqing oil field.Remaining oil at the edge of the river.