Geological Modeling Of The Fourth Member Of Shahejie Formation In Li371 Oil Reservoir

By analyzing our preliminary data as well as data from previous studies,I subdivided and correlated small layers in our study area,and laid the foundation for creating regional geological model.Then structure model was built based on fine structural interpretation.Facies model was acquired from sedimentary description.Reservoir character study provided basis for property models.According to the above researches,three-dimensional geological model of Es4 in Li371 oil reservoir was built with an integration of stochastic and deterministic modeling methods.I suggest that(1)the study area is an anticline controlled by the chennan fault in the north.Meanwhile,the formation of study area can be subdivided into three sand groups including 5 sub-layers.The structural trends of each layer are comparable.(2)The lower Es4 is mainly characterized as nearshore subaqueous fans with glutenite resevoirs,and the upper Es4 is gradually transformed into shore-shallow lacustrine sediment.The glutenite shows retrogradational characteristics because of the chennan fault.(3)The reservoir has unified oil-water interface,which is affected by regional structure and lithology,and the reservoir is significantly heterogeneous with medium porosity and permeability.Based on the basic geological characteristics of Li371 oil reservoir,the three-dimensional geological model for Li371 oil reservoir was established using deterministic and stochastic modeling methods in Petrel software.The structural model is established by integrating the section information of fine seismic interpretation and geological layer data.The lithology model was based on sand distribution maps,and subsequently the sequential Gussion simulation method was used in facies-controlled stochastic modeling.A number of models were established in order to select the best one as the three-dimensional petrophysical property model.The selected model matches the known geological features in study area and can be used for providing guidance for further oil and gas exploitation.