苏家次洼中部洼槽带地化录井技术的应用

Application of geochemical logging technology in trough belt in the middle of Sujia sub-depression

苏家次洼中部洼槽带是吉林油田首次勘探的区块,其油气的分布、油气的含量以及原油的性质都不清楚,为解决上述地质问题,应用了岩石热解、热解气相色谱、轻烃分析三项地化录井分析技术,其中岩石热解录井能够定量检测岩石中的含油量,热解气相色谱分析能够直观地判别原油的性质,轻烃分析检测C1-C9的天然气成分及汽油馏分,主要用于气层的识别。通过该区7口井15个已经试油层地化资料分析,采用图解法和参数图板法相结合的方法建立了该区储集层评价方法。该区应用地化录井技术收到了显著效果,发现营城组以油气共生、油水共生为主,沙河子组以含气为主,围绕洼槽带向周边扩展,具有油气显示逐渐减弱,含水逐渐上升的变化规律,从而为下一步生产决策奠定了良好基础。

The trough belt in the middle of Sujia sub-depression is the first exploration block in Jilin Oilfield,the hydrocarbon occurrence,hydrocarbon content and oil property are not clear.In order to solve the above geological problems,three geochemical logging analysis techniques for rock pyrolysis,pyrolysis gas chromatography and light hydrocarbon analysis are used,among which the rock pyrolysis logging can quantitatively detect the oil content in the rock,pyrolysis gas chromatography can visually discriminate oil properties,and light hydrocarbon analysis can detect the natural gas composition and gasoline fraction of C1-C9,they are mainly used to identify gas reservoirs.Based on the analysis of geochemical data of 15 tested formations in 7 wells in this area,the reservoir evaluation method in this area is established by combining graphic method with parameter layout method.The application of geochemical logging technology in this area has achieved remarkable results.It is found that Yingcheng formation is dominated by oil-gas coexistence and oil-water coexistence,Shahezi formation is mainly gas bearing,they extend around the trough belt to the surrounding area,with the changing law of gas and oil show gradually weakened and water cut gradually increased,thus laying agood foundation for the next production decision-making.