Recognition And Evaluation Of Fault Solutions

It is difficult to characterize,predict and describe fractured-cavern reservoirs because of their strong heterogeneity and various spatial types.Moreover,the prediction and fluid identification of fractured-cavern reservoirs are the technical bottlenecks of exploration and efficient development of complex oil and gas fields.Therefore,it is urgent to carry out reservoir prediction and comprehensive evaluation for fractured-cavern carbonate reservoirs.Based on geoscope seismic interpretation platform,this paper establishes three-dimensional seismic work area,extracts coherence,curvature and maximum likelihood seismic attribute slices from reservoir-Yijianfang formation,Cambrian source layer and overlying Silurian caprock.In order to predict fault-dissolving reservoir more deeply,we first use long-short cycles separation technology to screen weak vibration of Yijianfang formation in Yueman area of Harahatang.The information of hidden geological body with amplitude is extracted;secondly,the fracture and cave of reservoir in Yijianfang Formation are carved by using the technology of reservoir fracture and cave carving,and the predominant reservoir distribution area is divided;then,the oil-water interface is predicted and smoothed by using the technology of karst trend surface framework;finally,the reservoir characteristics in this area are comprehensively evaluated in plane,section and space,and the reservoir characteristics are evaluated.Systematic analysis and evaluation of stages,classifications,properties,plane segments and whether or not to communicate oil sources are carried out,and a comprehensive evaluation and classification of reservoir performance of the three regions in this area are carried out.The results show that the dissolution voids of the Ordovician Yijianfang Formation in the Yueman area of Harahtang have the characteristics of developing along faults;the overall source-reservoir-cap Association of the Ordovician Yijianfang Formation in the Yueman area of Harahtang is good,and the source-reservoir-cap relationship in the southern section is better than that in the northern section;the first-grade oil source fault of the Ordovician Yijianfang Formation in the Yueman area of Harahtang is NNE,and the second-grade oil source fault.In NNW direction,grade I source faults control oil and gas filling and migration.