Reservoir Quality Evaluation Of The Es4 Of Shahejie Formation In Yong 559,Dongying Sag

The reservoir of the Es4 of the Shahejie Formation in Yong'an Town,Dongying Sag,is a low-porosity and low-permeability glutenite reservoir.The internal changes of the glutenite in this area are complex,heterogeneous,and the classification of effective reservoirs is complex more difficult.In order to effectively reveal the reservoir type in the study area,it is urgent to establish a classification standard for the reservoir in the study area.Based on the core observation and core routine analysis experiments,the lithology and mineral composition of the reservoir in the study area are determined,and the main lithology of the study area is determined to be gravel sandstone,glutenite and fine conglomerate.Combined with mercury intrusion data and core sheet data,the pore type and channel type of glutenite reservoir were analyzed and the pore structure parameters were solved.The fractal dimension and mercury intrusion curve were introduced to classify and evaluate the pore structure of the reservoir.Four types of pore structure.Combined with logging curve and core experimental analysis data,the four-sex relationship of reservoir is determined,and the reservoir physical property variation range is determined,which has strong heterogeneity.For this reason,a nonlinear method is introduced in the establishment of porosity model.A prediction model between porosity and three porosity logs is established.An explanatory model between porosity and permeability is established.Based on this,the brittleness index is introduced to evaluate the compressibility of the reservoir,and a predictive interpretation model between the brittleness index and the logging curve is established.Finally,based on the pore structure parameters,core analysis physical properties,brittleness index and other parameters,the lower limit of physical properties of the reservoir is determined.The clustering method is used to effectively divide the reservoirs in the study area,and the classification criteria of the reservoirs in the study area are established.