Distribution of oil—water in reservoirs based on sedimentary microfacies and logging parameters
Objectives:Due to the great difference in buried depth,the rock-electric characteristics of Sangonghe Formation reservoirs in different regions of Junggar Basin are significantly different.The complex rock-electric relationship makes it impossible to establish a unified oil-bearing logging interpretation standard in the whole region.Methods:In view of the above problems,the isochronous comparison of sand groups in 22 coring wells in the study area and the analysis of sedimentary microfacies and sedimentary sand body superposition patterns were carried out,and the oil-bearing characteristics of each isochronous sand group were determined by logging data.Through the analysis of the differential electrical characteristics of oil and water layers in Shawodi and Zhengshacun areas,the reservoir fluid sensitive logging parameters are screened,the oil—water interface is identified,the oil—water interpretation standard is established in different regions,and the oil—water distribution law is studied.Results:The research shows that the Shawodi area belongs to the'conventional low-resistance reservoir',and the Zhengshacun area belongs to the'low-contrast reservoir'.The oil—water distribution of the reservoir is generally characterized by'upper oil and lower water','high oil and low water',and'upper dry and lower oil'.In the vertical direction,there are three characteristic patterns:① Oil—water layer—(poor oil layer)—water layer—dry layer;② Oil—water same layer—dry layer difference oil layer interbedded;③ Dry layer—high resistance water layer interbedded.The distribution of oil—water layer and oil—water interface shows obvious phase-controlled and layer-controlled characteristics,and is affected by micro-geomorphology.Conclusions:The oil—water interface in Shawodi area is mostly distributed in the fourth sand group,and the oil—water interface in Zhengshacun area is mostly distributed in the fifth sand group.The oil layer and oil—water layer are developed in the Heshangba superimposed sand body and the channel weak erosion superimposed sand body of the fourth and fifth sand groups.The oil-bearing water layer and the poor oil layer are developed in the Heshangba superimposed sand body and the channel weak erosion sand body of the third and sixth sand groups.The water layer and the dry layer are mainly distributed in the channel strong erosion sand body of the first and second sand groups.Analyzing the characteristics of oil—water relationship in the study area is conducive to providing a theoretical basis for further oil and gas exploration and deployment in the region,and also provides reference value for reservoir research to distinguish differential burial areas and deep burial areas.
sedimentary microfaciessand body overlay patternoil—water distributionthe Sangonghe Formationhinterland of Junggar Basin
万方数据
维普
