The Fractured Reservoir Research Of Basement In Block M,Yemen

Because the research area is in the initial stage of exploration,there is no systematic research for the fractured Basement reservoir,and the fracture development has very strong heterogeneity,so it is difficult to carry out fractures description and prediction.Therefore,it is necessary to carry out reservoir research for fractured Basement reservoir.This paper is based on the research results of the previous studies on regional geological characteristics,the lithology type and distribution of Basement were analyzed,the fracture characteristics were fine description,and the favorable of fracture development was prediction.According to core,thin section and well logging data and zirconite dating analysis,the lithology of Basement is main granite and metamorphiite,and the age of Basement is about 604~556Ma,the lithology in the western of this block is main granite.According to the fracture identification by the methods of outcrop,core and imaging logging technology,the fracture parameter such as the length,the density,the width,and so on were described finely,and the fracture development characteristics were summarized.Combined with the regional tectonic movement,the fracture stages were analyzed,and there are three fracture stages in this Block.Through analyzing the relationship between fracture and lithology,structure and fracture,the fracture development is main controlled by lithology,fault,structure,and dissolution,the granite and its metamorphic rocks,the area near the fault and the high belt of the structure are relatively easy to form fractures.are most likely to form factures in this block and adjacent area,secondly,the schist is likely to form fracture due to cracks development;On the basis of above analysis,combination with hydrocarbon shows and PLT logging,the fractured reservoir of Basement were divided,the evaluation criteria of fractured reservois were eastablished.At the same time,using the technology of tectonic stress,the curvature,ant tracking to predict the fracture development area,according to prediction,the fracture relatively development in the west slope,the east fault step and “the uplift in sag” of central depression zone,and the accuracy of the prediction has also been verified by drilled well.Because there are some traps in the central depression zone,the relative development of fractures in this prediction,it is an important replacement area for the next exploration.