论文部分内容阅读
为研究异构比φ_(iC_4)/φ_(nC_4)和φ(iC_5)/φ_(nC_5)在油气勘探中的应用,采集了渤海湾盆地中部的100个柱状样,分析测试其酸解烃含量,各层的nC4的含量普遍比iC_4的含量高,而各层的iC_5含量普遍比nC_5的含量高,iC4和nC4的数据完整性要远比iC_5和nC_5的好,在异构比φ_(iC_4)/φnC4等值线叠加图中挑取11组典型φ_(iC_4)/φnC4值进行讨论,发现通过分析异构比的垂向变化可以推断地层中起主导作用的分异效应,并确定轻烃向上运移的路径和方向,φ_(iC_4)/φ_(nC_4)等值线图与AC4异常等值线图具有很好的对应关系,在研究区φ_(iC_4)/φnC4值>0.85的为背景,φ_(iC_4)/φ_(nC_4)值<0.85的为异常,在油气勘探中可通过异构比与轻烃异常的这种对应关系来判断油气的分布情况,这一异常判断标准对渤海湾盆地的烃类异常判断具有重要的指示意义。
In order to study the application of isomerism ratio φ_ (iC_4) / φ_ (nC_4) and φ (iC_5) / φ_ (nC_5) in oil and gas exploration, 100 columnar samples from the central Bohai Bay Basin were collected and analyzed for their acidolysis , The content of nC4 in each layer was generally higher than that of iC_4, while the content of iC_5 in each layer was generally higher than that of nC_5. The data integrity of iC4 and nC4 was much better than that of iC_5 and nC_5. ) / φnC4 isosurfaces, 11 groups of typical φ_ (iC_4) / φnC4 values are selected for discussion. It is found that the dominant effect of stratigraphic differentiation can be inferred by analyzing the vertical variation of isomerization ratio and the light hydrocarbon (IC_4) / φ_ (nC_4) contour map and AC4 anomaly contour map have a good correspondence, in the study area φ_ (iC_4) / φnC4 value> 0.85 as the background , φ_ (iC_4) / φ_ (nC_4) values of <0.85 are anomalies. In oil and gas exploration, the distribution of oil and gas can be judged by the correspondence between isomerism ratio and light hydrocarbon anomaly. Basin hydrocarbon anomalies have an important indicator.