莫里青断陷西北缘断褶带双二段储集层地化录井技术应用

西北缘断褶带是莫里青断陷北部的靠山凹陷与古地层逆向超覆而形成的多级断褶带,其断层十分发育、砂体分布极不均匀、油质变化很大、显示发育也存在很大差异,尤其是双二段储集层变化更大。为解决油气显示识别难和解释难度大等问题,引进了地化录井技术,采用岩石热解分析、定量荧光分析及热解气相色谱分析方法可准确判别油水层,使得油气显示发现率达到100%;同时应用地化分析数据建立了岩石热解分析评价图板和定量荧光分析评价图板,并归纳出西北缘断褶带油水层解释评价标准,显著提高了录井解释精度,资料解释符合率达到91.0%。地化录井技术的应用为现场及时发现油气显示和准确评价储集层奠定了基础,在勘探开发中切实发挥了指导作用。

Application of reservoir geochemical logging technology to Shuang 2 Member of fault-fold belt in northwest margin of Moliqing fault depression

Fault-fold belt in northwest margin is a multi-stage fault-fold belt formed by reverse overlap between Kaoshan sag and ancient strata in the north of Moliqing fault depression.The faults are well developed,the distribution of sand bodies is extremely uneven,and the oil property varies greatly,showing great differences in development,in particular,Shuang 2 Member reservoir changes more.In order to solve the problem of difficult identification and interpretation of the show of gas and oil,geochemical logging technology is introduced.By using rock pyrolysis,quantitative fluorescence and pyrolysis gas chromatography,oil and water layers can be accurately identified,making the show of gas and oil discovery rate up to 100%.At the same time,the paper uses geochemical analysis data to build pyrolysis analysis evaluation chart and quantitative fluorescence analysis evaluation chart,and summarizes the interpretation and evaluation criteria of oil and water layers in fault-fold belt of northwest margin.The mud logging interpretation accuracy is significantly improved,the coincidence rate of data interpretation reaches 91.0%.The application of geochemical technology lays a foundation for field timely discovery of the show of gas and oil and the accurate evaluation of reservoirs,and plays a guiding role in exploration and development.