Research On Comprehensive Valuation And Optimum Selection Of Favorable Explporation Target In Wangfu Depression

Reservoir comprehensive valuation is to deepen the understanding of the law of oil and gas generation,migration and accumulation through the work of three-dimensional earthquake,drilling and oil test,and to optimize the beneficent area through the comprehensive valuation of reservoir,and to further deploy evaluation wells,so as to achieve the goal of economic and efficient development.The geological characteristics of the reservoir in Wangfu depression is analyzed and studied in this paper,and fault and local microamplitude structures is determined through new drilling data and 3D seismic interpretation data.The sandstone of Fuyi group and Fuji group is developed,and is in a strip pattern,the thickness is 30~50m.The channel body development and crisscross,the whole of the 5 complex reservoirs in the study zone is the network of the southern channel,that is,the great curvature of the southern channel and the network of the northern channel.The reservoir characteristics and sedimentary microfacies characteristics of Wangfu depression is further deepened by using three dimensional seismic stratified sandstone and effective thickness prediction.According to the physical analysis data of 748 core samples from 19 wells in the study area,the porosity was 1.96%to 27.17%,the average was 9.96%,the air permeability was 0.05%to 89 mD and the average was 1.43 mD.The distribution of oil and water is determined by combining the results of structural research,reservoir prediction and well logging,well logging and oil test.The storage mode of the interior of the sag is "upper generation".The pattern of the depression slope is "upper and lower reservoir lateral movement".Oil and water distribution above the main oil launched,the local presence of water sandwich.In this paper,oil well test data,well development data,logging data are used to study the fluid properties of crude oil and to evaluate single well productivity.Based on the understanding of geological characteristics and productivity characteristics of reservoirs,classification of preferred 2 favourable blocks,preferred oil area 133.8 km~2,estimated Geological reserves 3120.7×10~4t.