| The Ordos Basin is rich in oil and gas resources.The Chang 8 reservoir in Zhenjing area has complex lithology,low permeability and characteristic pore network system with a large amount of residual water.In order to evaluate reservoir more accurately and meticulously,we carried out a comprehensive evaluation study of low permeability oil reservoirs by understanding electrical characteristics,movable fluid characteristics and the relationship between lithology,physical properties and oil-bearing properties of oil and water layers in Chang 8 reservoir.Firstly,the author of this paper investigated and studied relevant electrical laboratory analysis and testing data and made a comparative analysis with the logging data,confirmed the basic characteristics and plane distribution of Chang 8 member of Yanchang formation and established the isochronous stratigraphic framework.We cleared the sedimentary facies characteristics and types by studying and analzsing these data.Secondly,we analyzed the diagenetic types and features.Combined with the core data of reservoir,we studied the lithology analysis,physical property,pore throat structure of reservoir and the layer characteristics as well.Through the analysis of diagenesis research,we provided the accurate geological model for comprehensive evaluation of reservoirs.According to coring analysis data and logging data and test The establishment of production data,reservoir lithology,physical property,electrical property and oil-bearing property between the "Four Relations",further establish the precision reservoir of the Chang 8 member target layer criterion;interpretation model of reservoir parameters is established and calculated and test results,and provided a reliable model for calculating reservoir the parameter selection;Finally,we chose some sensitive parameters related to reservoir classification and identification,established the comprehensive evaluation index and evaluated reservoir. |
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