The Fracture And Cave Reservoir Prediction In Yijianfang Formation Of Yingmai2 Block,Yingmaili Area

The Yijianfang reservoir in Ordovician of the Yingmai2 area,Tarim Basin belongs to the super deep carbonate reservoir in the kind of fractured and cave.The reservoir which is heterogeneity,is controlled by faults typically,faults has the core meaning of the reconstruction of the reservoir.In recent years,the production between well has large difference and it is difficult to maintain the production in a steady level due to the unclear understanding of the anisotropy of the reservoir distribution caused by wells productivity difference,increasing the difficulty of production,fracture has significance for the transformation of the core.Therefore,as the goal of the cave reservoir formation and distribution,the essay combined with seismic and geological methods,carry out the research of fault interpretation and fracture cave reservoir prediction based on geological model.We get the research results as follows:(1)Most displacement of strike slip fault in the study area is smaller,the breakpoints are not clear,and experienced the dissolution and alteration,the seismic reflection is not clear,which results in two major science and technology problems.Aiming at the above problems,the essay put forwards a fault interpretation method called "five classification,three subjects".Through the analysis of dynamics,kinematics and geometry,it does the research by classifying the faults by nature,stage,grade,reliability,subsection characteristics,reach the goal of the precise fault interpretation under the guidance of geological model;(2)Waveform classification,the trend of abnormal body and the seismic inversion technology are used to predict the reservoir of fracture and cave,it establishes the relation between porosity and impedance version in reservoir prediction,it makes seismic threshold selection by drilling and development information,which reach the goal of reservoir evaluation.Reservoir prediction result has a good relativity with the drilling results;(3)It put forwards an opinion that the distribution of the fracture-cave reservoir is controlled by fault.There are fracture-core reservoir in the high position hold by the reverse thrust fault,and in the areas where the strike slip faults controls there are reservoirs of caves and fractures developed;(4)Combining the structure and production characteristics,the work area is divided into 5 zones,and the reservoir development model is established.The reasons for the differential reservoir distribution are explained,and two favorable zones are put forward.The research results provide the geological basis for drilling evaluation,reservoir evaluation and the development adjustment program design of the yingmai2 oilfield.At the same time,there are important reference and guiding significance for exploration and development of carbonate reservoirs which are similar to geological conditions in China and abroad.