Heterogeneity characteristics of deep tight sandstone reservoir and its controlling factors:a case study of Ju-rassic Qigu Formation in Yongjin Area,Junggar Basin
Taking the Jurassic Qigu Formation in Yongjin Area of Junggar Basin as an example,based on the data of core,thin section,reservoir physical properties and logging data,the quantitative study of heterogeneity parameters was carried out to analyze the heterogeneity characteristics of deep tight sand-stone reservoirs and clarify the controlling factors of reservoir heterogeneity.The results show that the Qigu Formation in the study area is divided into 1-6 sub-layers from bottom to top.The grain size rhythm and permeability rhythm are mainly positive rhythm.In terms of intra-layer heterogeneity,the heterogeneity of the three sub-layers is the strongest.In terms of interlayer heterogeneity,the sand bodies of 1-3 layers have a large distribution area and good connectivity,and the sand bodies of 3 layers are the most developed.In terms of plane heterogeneity,1-4 layers have strong heterogeneity.The het-erogeneity of small layer 3 is the strongest,followed by small layer 2,small layer 4 and small layer 1.Sedimentation affects sand body distribution and material composition,which is the basis of reservoir heterogeneity.Diagenesis can improve pore structure and type,which is the key factor affecting reser-voir heterogeneity.The results have guiding significance for oil and gas exploration in Yongjin Area of Junggar Basin.
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