The Study Of Well Logging Productivity Prediction Method In Low Porosity And Permeability Can Be Improved Reservoir

The correct evaluation of reservoir productivity can not only test the results of oil and gas exploration,but also provide the basis for the development of oil and gas fields,which is of great value to improve the economic benefits of oil and gas exploration and development.Low permeability reserves of oil and gas reservoir plays an important role in the distribution of oil and gas resources,low permeability reservoir,the general need for acid fracturing to reach the mining industry value forecast,less mature reference capacity after fracturing with conventional logging data.Therefore,the study of low porosity and permeability reservoir productivity prediction is of great significance to the development of low permeability reservoirs.At present,many geological,reservoir and geophysical workers have done a lot of research,but has not yet formed a more general method of production prediction.The study area is XF block and XG block.XF block is a typical low porosity and low permeability sandstone reservoir.There is no natural productivity,almost every need wells fracturing,mainly for the production capacity after fracturing production.The lithology of the area is more complex than that of the XF block.The area have natural productivity,fracturing productivity and acidification productivity.The purpose of this paper is to develop a practical method for evaluating the productivity of low permeability sandstone reservoir with low porosity and permeability.The key factors affecting the productivity of the study area is not clear,the reservoir evaluation based on the analysis of the influence of reservoir parameters on the productivity,and the influence of reservoir parameters and fracturing parameters on productivity have been studyed,and the productivity prediction model was established for each block.The logging series in the study area are incomplete.Neutron and density curves are measured only in partial coring wells.According to the research of the XF block and XG block,the main achievements are as follows:1.Established a statistical model of porosity and acoustic velocity,permeability and porosity of XF block.established a XG block porosity volume model of gray and muddy correction and single correlation with porosity permeability based on statistical model.2.XF block built Archie model,Archie model with variable parameters(m)and the equivalent rock component model,and compared three kinds of saturation model to evaluate the effect that the equivalent rock component model and the variable parameter(m)is better than the Archie model the Archie model.XG block Archiemodel is established to evaluate the degree of saturation.3.According to test data of XF block,a prediction model based on Fisher discriminant productivity level is established.according to the test data of XG block,first built measures(natural-production,hydraulic fracturing and acidizing)criteria basing on well logging data AC and GR.At last we establish productivity level prediction chart for the hydraulic fracturing test layer.