Logging Evaluation Of The Lower Member Of The Ordovician Yingshan Formation In The Tazhong Block Of The Tarim Basin

The carbonate reservoir has been a kind of important reservoir type for a long time.A lot of researches have been carried out in logging evaluation,and a series of achievements and understanding have been made.However,with the deepening of geological understanding and the development of the degree of gradual increased,the understanding of reservoir space is required to be more clear and detailed.It is more helpful to develop production and production forecasting from the logging point of view to further refine the vuggy reservoir into pore reservoir and vug reservoir.Based on the analysis of core and thin slices,this paper analyzes the effects of core and well,such as core,well logging,logging,and other dynamic and static data,on the basis of core and slice analysis of porosity and porosity in the Lower Ordovician Yingshan Formation in Tazhong area of Tarim Basin.By the characteristics of the imaging logging response,the fine storage space identification plate is established,and then the reservoir type is effectively divided.The reservoir of this area is divided into four types:porosity type,vuggy type,fracture type and fracture-vug type.With the analyzation and summary of the characteristics of conventional and imaging logging responses and logging characteristics of reservoir types,a logarithmic response pattern for different reservoir types was established.Based on the study of the relationship between the four dimensions,the model of reservoir parameters such as matrix porosity,fracture porosity,permeability and saturation is established by using the physical model and the core scale logging.And the necessary scale and correction were made for the fracture porosity calculated by the conventional double-lateral data which used the imaging data.The model of fluid motion index is established by array acoustic data,and the seepage capacity of reservoir is evaluated.According to the core analysis and oil test data,the comprehensive empirical method,the oil test method and the minimum flow hole throat method,the effective thickness limit of the reservoir is determined,and the reservoir evaluation standard is established.The application of practical data shows that the coincidence rate of logging interpretation has been improved.