Study On Fracture Development Characteristics And Prediction Of Upper Permian Glutenite Reservoir In Fukang Sag

Fukang sag in Junggar Basin is an important substitute area for the exploration of Permian lithologic reservoirs.It has been proved that fractures play an important role in the production of single well.Therefore,through the collection and analysis of seismic data,logging data and core data with high gun and track density,this paper discusses the structural deformation characteristics,reservoir development characteristics,fracture development characteristics and fracture prediction methods in the study area,which is of great significance for oil and gas exploration in the study area.In the late Hercynian period,except for the eastern part of the working area,all of the study area received Permian deposits.According to the analysis of sedimentary rhythm,the Permian is mainly composed of fan-delta front subfacies deposits,and the bottom conglomerate is the favorable exploration layer.Through the comprehensive application of amplitude and inversion,it is predicted that the favorable reservoir is mainly controlled by the eastern provenance,and the sand body is distributed in continuous sheets along the groove under the slope.The research on fracture development law in favorable reservoir is mainly divided into two categories based on logging data and seismic data.Firstly,through the comprehensive analysis of core,imaging logging,resistivity and other logging data,it is concluded that the main types of fractures in favorable reservoir are structural fractures,mainly shear fractures,and most of them are high Angle fractures.The fracture strike is northwest to southeast,mainly developed along the fault zone,and the Angle between the fracture and the direction of the maximum horizontal principal stress is small,so the fracture effectiveness is good.In addition,the characteristics and prediction of post-stack and pre-stack fractures are studied based on seismic data.By extracting the attributes of post-stack coherence,curvature,maximum likelihood and gradient structure tensor,and then by multi-attribute fusion,the multiscale fracture and fracture development map and fracture development strength are predicted comprehensively,and the results are in good agreement with real drilling.Prestack frequency gradient attribute is used to analyze and predict the fractures in the study area.The fractures in the study area are mainly developed around the fault zone,and the larger the fault scale,the more developed the fractures are.The development direction of the fractures is mainly NW-SE,consistent with the fault zone.The four fracture zones identified in this study are favorable exploration zones for the next step.