Research On Distribution And Main Controlling Factors Of Oil And Water In Shen 161 Block Of Damin Tun Depression

Research on the results of the predecessors' research of the fine reservoir in Shen 161 block,Daming tun depression of Liaohe Oilfield in this paper.The research method combining geophysics and geology.The data of drilling,core,logging,mud logging,analysis and testing are studied.The oil and water distribution pattern and main controlling factors of fine reservoir in Shen 161 block of Liao He Oilfield are studied deeply.The oil area of the trap in Shen 161 block in this study area is about 4.0km2,and the actual exploration of the geological reserves is about 471×104t,the recoverable reserves are more than 100×104t,and the calibration recovery is 23.35%.The buried depth of the reservoir is 2400~2900m,and its reservoir type is a typical structural lithologic reservoir.The vertical and horizontal production of oil reservoirs is insufficient,and the extent of fault block mining is low,which is only 13% of the proven reserves.The study area in this area is the Sha32 section,which can be divided into four sand layers,:the I?II?III?IV segments of Sha32 section.The lower part of the structure has thickening trend,and the sandstone composition of the reservoir is mainly terrigenous clastic.There are many types,including gravel and gravel like sandstone,glutenite,coarse sand,medium sand,fine sand and siltstone.The heterogeneity of reservoirs is more serious,and the pores are mainly primary pores and secondary dissolution pores are secondary.Based on the data of a series of survey,logging data,oil test and core analysis,the relationship between the four properties of the reservoir in Sha32 section of the Shen 161 block is analyzed and studied.Through comparative analysis and verification,the fluid identification method,such as resistivity and porosity logging value rendezvous method,depth resistivity difference method,Rt/Rs and Rt rendezvous method,is used to identify fluid properties,and the fluid property interpretation standards are established by these methods.After a series of research and comparison,the minimum value of the porosity of the reservoir is 7.5%,the lowest reservoir permeability is 5m D,and the lowest oil saturation is 41%.Then using the established mathematical model formula and the oil and water layer interpretation standard to analyze and compare the development wells,effectively identify the reservoir fluid properties,and get the distribution of the 161 reservoir fluid.Through the identification of reservoir fluid in single well,it is found that the method of identification is more accurate.Then the fluid identification profile is established,and the fluid distribution in plane and vertical direction is evaluated intuitively.Finally,the main controlling factors affecting the distribution of oil-water distribution are determined based on the reservoir characteristics,four properties and the distribution of oil-water distribution.