Study On Quantitative Physical Heterogeneity Evaluation Methods Of Ultra Heavy Oil Sand Reservoirs In XinJiang Fengcheng

Xinjiang Karamay Fengcheng Oilfield has the largest super heavy oil reservoir in China.The success of SAGD pilot test of super heavy oil in the certain well area makes the SAGD technology to be popularized industrially,but Fengcheng super heavy oil reservoir developed the interlayer and strong heterogeneity of physical properties.The intercalation has a certain barrier effect on the heat conduction of injected steam,which affects the diffusion of steam between injection and production wells,and has a bad effect on the production effect of SAGD well group.Therefore,it is of great significance to quantitatively evaluate the heterogeneity of the physical properties of super heavy oil reservoirs and to quantitatively identify the distribution of separated interlayers.Based on the previous study,this paper has investigated the logging,core analysis,seismic data of the SAGD deployment area of Qigu reservoir in the southeast of X well area,and applied high-resolution sequence stratigraphy to the fine division of the J₃q₃ layer,and studied the sedimentary,lithologic,reservoir physical characteristics of the deployment area.Combined with the lithology,physical property analysis data and electrical characteristics of coring wells,the lithologic,electrical and physical properties identification criteria of interlayers in the study area were determined.Using the sedimentary configuration model of braided river,the geo-statistical method,seismic waveform classification and other means,the interlayers prediction research has been completed.Finally,based on the fine description of the interlayer,a fine three-dimensional geological model of the study area is created by Petrel.The heterogeneity of reservoir physical properties is quantitatively evaluated from three aspects:inner layer,interlayer and plane,The results show that the reservoir of J₃q₃layer has the characteristics of"high porosity,high permeability and high oil saturation".The reservoir in the study area belongs to a strong inhomogeneity reservoir,and the reservoir heterogeneity decreases from bottom to top,and the physical property and oil-bearing property become better.