论文部分内容阅读
四川盆地周边冲断褶皱变形带内有很大的含天然气前景。然而,气藏的分布是非均一的。通过对川东北构造变形带的平衡地质剖面研究,结合对构造演化过程中有机质成熟历史和油气产出特征的分析,认为川东北气藏的形成主要受构造变形过程中天然气的二次运移造成在有利的构造圈闭中富集;特别是在生储盖条件类同的前提下,气藏的分布主要受发育在弱能干层中台阶状逆断层所控制的具有一定高宽比的相关褶皱中。据此,对川东北区天然气藏的靶区进行了分析和预测。
There is a great prospect of natural gas in the thrust fold zone around the Sichuan Basin. However, the distribution of gas reservoirs is not uniform. Based on the study of the balanced geologic profile of the tectonic deformation zone in northeastern Sichuan and the analysis of the mature history of organic matter and the characteristics of oil and gas production during tectonic evolution, it is considered that the formation of gas reservoirs in northeastern Sichuan is mainly caused by the secondary migration of natural gas during the tectonic deformation Enriched in favorable structural traps. Especially under the same conditions of reservoir-reservoir conditions, the distribution of gas reservoirs is mainly related to the folds with a certain aspect ratio controlled by stepped reverse faults in the weak-energy stratum in. Accordingly, the target area of natural gas reservoir in northeastern Sichuan was analyzed and predicted.