Study On The Parameters Of Ultra-low Permeability Reservoir By Multi Data Combination

Because of the complexity of pore space geometry of ultra-low permeability reservoir,it is not clear about the reservoir characteristics,the four relationship of oil-gas layers and the distribution law of oil-gas layers,which increases the difficulty of oil-gas layer identification and reservoir evaluation.In order to solve these problems,it is necessary to strengthen logging interpretation and reservoir parameter research.This paper takes Chang8 reservoir in Dongzhi District of Xifeng Oilfield as the research object.First of all,the curve reconstruction and R/S curve are used to divide lithology,the relationship among four reservoirs is analyzed and the "core calibration logging method" is used to establish a fine interpretation model of reservoir parameter logging;Secondly,considering pseudo-threshold pressure gradient,the well test model is established by the characteristic point method,time-lapse method and spatial comparison method,the well test unit is divided based on the inter-well distance,and the ratio coefficient of logging permeability and well test permeability is introduced;Finally,integrating the logging porosity interpretation and the permeability of reservoir,the classification index of flow unit is determined and the difference of flow unit is evaluated,on this basis,a three-dimensional numerical model is established.To sum up,this paper solves the reservoir parameters through joint solution of back-calculating method of well logging parameters and well testing parameters,which improves the accuracy of parameter interpretation of ultra-low reservoir and the fitting rate of three-dimensional numerical model,and produces the necessary technical support for the development of ultra-low reservoir.