从有机质成熟度看四川盆地下古生界油气勘探

从回顾有机质成熟度检测研究现状入手，论证认为镜质体反射率至今仍是有机质成熟度研究的最佳参数。以此为据，编绘了四川盆地上二叠统有机质成熟度图；通过对其与下伏产层油气属性关系的分析，探讨了四川盆地下古生界因缺乏镜质体作为检测对象而被迫选用其他参数用于有机质成熟度划分所存在的可变因素；最后借用四川盆地上二叠统有机质成熟度演变趋势分析结果，确认川东-川东北有机质过成熟地区的高陡构造仍不失为该区天然气勘探的目标区。

A DISCUSSION ON PETROLEUM EXPLORATION OF THE LOWER PALEOZOIC IN SICHUAN BASIN FROM THE VIEWPOINT OF ORGANIC METAMORPHISM

Beginning with review of the research of organic matter maturity, this paper demonstrates that vitrinite reflectance is still the optimum authoritative parameter for research of organic matter maturity, and then mapped out the maturity of the Upper Permian in the Sichuan Basin. Parameters other than vitrinite reflectance were previously used to determine the organic matter maturity of the Lower Paleozoic in the Sichuan Basin for lack of vitrinite, resulting in some unexpectedly variable factors. This paper discussed on those variable factors based on an analysis of the attributive relation between the maturity of the Upper Permian and the oil and gas in the underlying reservoirs. In light of the research on the trend of organic matter maturity evolution in the Upper Permian in the Sichuan Basin, this paper suggests that the steep structures in the post mature areas in eastern northeastern Sichuan Basin should be the targets for future gas exploration in the study area.