Geophysical Characteristics And Multi-parameter Inversion Of Oil And Gas Reservoirs In Songliao Basin

As one of the world's super large continental petroliferous basins,Songliao has prosperous hydrocarbon resources.A great breakthrough has been made in oil and gas exploration in Songliao Basin in recent decades,and oil and gas exploration has entered a new stage.The area studied in this thesis is located in the south of the Changling fault depression,and the main gas-producing layer is Yingcheng Formation.Since the reservoir is thin and the lateral variation is great,it is difficult to explore oil and gas.Seismic exploration technology is one of the most essential means in oil and gas exploration.It can accurately describe the geophysical characteristics of oil and gas reservoirs.This thesis makes a comprehensive analysis of the favorable reservoir through the use of seismic attribute analysis,wave impedance inversion technology and multiple parameters inversion technology.The thesis summarizes the abnormal characteristics of the oil and gas reservoir based on two common seismic attribute sections of instantaneous frequency and amplitude.It optimizes the suitable method for the area studied in this thesis by combining with the actual situation of seismic data in the studied area and comparing the application effect of three typical methods of wave impedance inversion including model inversion,sparse pulse inversion and recursive inversion.According to the inversion results,the recursive inversion is the most realistic reflection of seismic data,and can better reflect the oil-bearing property of the reservoir,but its disadvantage is that the lateral resolution is not high.The thesis obtains the characteristics of high impedance in favorable reservoirs after analyzing the geophysical characteristics of volcanic and sandstone reservoirs in the Yingcheng Formation with recursive inversion.According to the difference of resistivity and natural Gamma value of sandstone,mudstone and volcanic rock,this thesis constructed an empirical formula for the target formation in the study area.This formula consists of Resistivity,Natural Gamma and Wave Resistance Antibody in logging data.The data volume of different parameters is obtained by the above method in this thesis.And the data volume improved the prediction accuracy of oil and gas reservoir,promoted the lateral resolution and more clearly depicted the low amplitude structure of the favorable reservoir,which is more conducive to find a favorable reservoir.Through the combination of geology,logging and three-dimensional data in the study area,this thesis delineates the favorable reservoir areas after comprehensively analyzing the plane and section with the seismic attribute slice and inversion slice of the target layer.