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四川盆地南部地区广泛发育下古生界寒武系、志留系等多套海相页岩层,其中龙马溪组是该区页岩气勘探开发的重点目标层。根据钻井岩心资料,通过有机碳、热解、碳同位素、等温吸附等地球化学实验分析,对川南地区下志留统龙马溪组页岩的有机质特征及其对页岩含气量的影响进行了研究。结果表明,川南地区龙马溪组页岩有机碳含量较高(平均1.53%),有机质类型较好(Ⅰ型和Ⅱ1型),热演化程度高(Ro为1.94%~2.42%),且页岩含气量较高(平均1.85m3/t)。页岩有机质特征是影响页岩含气量的主要因素,有机质丰度、有机质类型和热演化程度三者共同决定了川南地区龙马溪组页岩的含气量。
The Lower Paleozoic Cambrian and Silurian marine facies shale formations are extensively developed in the southern area of Sichuan Basin. Longmaxi Formation is the key target area for shale gas exploration and development in this area. According to the data of drilling cores, the organic matter characteristics and their influence on the shale gas content in the Lower Silurian Longmaxi shale are studied by geochemical experimental analysis of organic carbon, pyrolysis, carbon isotope and isothermal adsorption . The results show that the shale in the Longmaxi Formation in the southern Sichuan area had a high organic carbon content (average 1.53%), good organic matter types (type I and type II1), high thermal evolution (Ro, 1.94% -2.42%), Higher gas content (average 1.85m3 / t). The organic matter characteristics of shale are the main factors affecting shale gas content. The abundance of organic matter, the type of organic matter and the degree of thermal evolution jointly determine the gas content of the shale in the Longmaxi Formation in southern Sichuan.