Seismic Prediction Of Fractures In Permian Fengcheng Formation In Manan Slope

In recent years,the exploration objects in the Junggar Basin have gradually shifted from the middle-shallow layers to the deep layers.However,the physical properties of the deep layers are generally poor.According to the exploration research in other areas,deep burial,ultra-high pressure and fracture are the three key factors for high yield.The selected study area is the 3D of the well Mahu 1 area,and the interpretation target layer is the Permian Fengcheng Formation.The overall physical properties of the reservoir are poor,and dolomitic sandstone strips are developed.It is an unconventional tight oil reservoir.Combined with the logging knowledge in the study area,comprehensive analysis shows that the development of fractures in the target layer is an important factor affecting the production in the study area.Therefore,fracture prediction is the key content of the next exploration and development.In this thesis,post-stack and pre-stack fracture prediction methods are used to predict fractures at different scales in the target layer of the study area.First,the coherent attribute volume is used to describe the large-scale fracture distribution in the study area;then the curvature attribute and the thin likelihood attribute are used to predict the fractures in the medium and small scales;and then the principal component analysis method is used to integrate various data to strengthen the understanding of the fracture development law in the study area;and then the pre-stack P-wave azimuthal anisotropic fracture prediction method is used to predict the fractures in the pilot test area of the study area;and finally,the prediction accuracy of several methods is verified by imaging logging in the study area.Through research and analysis,a detailed description of the fracture development area in the well Mahu 1 area is completed,which effectively supports the subsequent well deployment in the Manan area;In the pilot test area,well pre-stack fracture prediction results have been obtained,which provides a reliable basis for the subsequent deployment of horizontal wells and the selection of development test areas.