Bedrock Reservoir Logging Evaluation of Pingxi Area in Qaidam Basin

She Gang;Gui Pengfei;Chen Yong;Meng Qiang;Zhou Xiangguo;Hao Zhao;China Petroleum Logging Co.Ltd.;

bedrock reservoir;;reservoir parameter;;fracture;;logging evaluation;;Pinxi Area;;Qaidam Basin

The bedrocks in the Pingxi Area of Qaidam Basin are complex in lithology and diverse in reservoir space. It is difficult to identify lithology,physical property evaluation and effective reservoir division according to conventional logging methods. According to the core and thin section analysis data,the bedrock is mainly composed of schist and metamorphic limestone,and the schist is slightly better than metamorphic limestone in physical property. Based on the lithology identification,combined with conventional logging data,special logging data such as electrical imaging,elemental capture(ECS),array acoustic wave,etc. are used to form methods for evaluating bedrock porosity,pore structure and permeability. In this way,the effective reservoir classification and gas bearing identification criteria are established. The results of application in multiple wells indicated that the bedrock gas reservoir is affected by crack distribution,lithological change and reservoir heterogeneity,showing heterogeneity,and the gas reservoir has no uniform gas-water interface.