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中国南方地区(四川盆地、十万大山、思茅盆地等)属于古生代海相沉积盆地,下古生界页岩分布面积广、厚度大,热演化程度高,经历了复杂的构造运动,这些页岩不仅是盆地内常规气藏的烃源岩,而且还具备页岩气成藏的地质条件。但是在高演化条件下,页岩中的一些性状发生了改变,使得其有机质成熟度的确定成为一大难题,一些传统的成熟度测试方法可能不再适用。本文以渝东南地区的牛蹄塘组和龙马溪组的高演化页岩为实验对象,对这些成熟度测试方法进行探讨和对比,研究各种方法的优缺点和适用范围,进而提出高演化页岩有机质成熟度测试方法的选择原则。
Southern China (Sichuan Basin, Shimantan Mountain, Simao Basin, etc.) belonged to the Paleozoic marine sedimentary basin. The Lower Paleozoic shale has a wide distribution, large thickness, high thermal evolution and complex structural movement. These shale It is not only the source rock of conventional gas reservoirs in the basin but also the geological conditions of shale gas accumulation. However, under the conditions of high evolution, some traits in shale have changed, making it difficult to determine the maturity of organic matter, and some traditional maturity testing methods may not be applicable. In this paper, the high-evolution shale in Niutitang Formation and Longmaxi Formation in the southeastern Chongqing area is taken as the experimental object, and the maturity test methods are discussed and compared to study the advantages, disadvantages and applicability of the various methods. Then, Selection principle of rock organic matter maturity test method.