Reservoir architecture and remaining oil distribution characteristics of farshore subaqueous fan:a case study on NS fault block in Huanghua Depression
This paper is the result of petroleum geology.[Objective]The oil fields in eastern china have generally entered the middle and later stages of development,the distribution pattern of remaining oil is very complex,the remaining oil formed by the internal seepage barrier and seepage difference control within the reservoir is an important goal,conducting research on the distribution characteristics of residual oil controlled by reservoir configuration can effectively improve the development efficiency of oil reservoirs.[Methods]The research area is located in the third member of Shahejie Formation in Gangzhong of Huanghua Depression,Analyzing and researching through data such as rock cores,logging,and seismic data,analyze the distribution characteristics of sedimentary microfacies,the characteristics and spatial combination relationships of single sedimentary units and internal configuration units,and distribution characteristics of interlayer,establish a reservoir configuration model and a three-dimensional geological model,based on which to conduct numerical simulation research on the reservoir and characterize the distribution characteristics of remaining oil.[Results]The study clarified the types and levels of configuration units in the offshore underwater fan reservoirs,determined the distribution characteristics of reservoir configuration units in the study area,and summarized the remaining oil distribution patterns based on configuration.Research has shown that the configuration interfaces of offshore underwater fan reservoirs and the different levels of configuration units divided by these interfaces control the macroscopic distribution of remaining oil;The four distribution patterns and their combination patterns of single microfacies in this area are defined,they are the main body of alluvial lobes-the main body of alluvial lobes,the lateral edge of alluvial lobes-the lateral edge of alluvial lobes,the alluvial lobes-the inter-channel mudstone-the alluvial lobes,the lateral cutting and stacking of alluvial lobes;Summarize 5 patterns of the remaining oil distribution,they are controlled by reservoir configuration factors of offshore underwater fan sedimentation,and applied in well deployment practice.[Conclusions]Based on the understanding of research results on research area configuration,applying numerical simulation to analyze and study the control effect of reservoir configuration on remaining oil distribution in offshore underwater fan reservoirs,Sum up five remaining oil distribution patterns.This has a reference value for improving the recovery rate of remaining oil in similar reservoirs in eastern China.
far shore subaueous fanarchitecturedistribution of interlayerremaining oilHuanghua Depression
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