论文部分内容阅读
根据岩心、钻井及露头等资料,以有机地球化学、储层岩石学等为重点,对苏北地区古生界下寒武统幕府山组、上奥陶统五峰组—下志留统高家边组、二叠系(孤峰组、龙潭组、大隆组)等3套富有机质泥页岩层系的页岩气形成地质条件进行初步分析,指出苏北地区古生界3套富有机质泥页岩层系分布面积广、厚度较大、有机碳含量高和热演化程度较高。与美国典型含气页岩相比,苏北地区古生界3套富有机质泥页岩层系有机质丰度与之相当,部分地区的成熟度偏高。苏北地区具有形成页岩气的良好物质基础,古生界页岩气勘探潜力大。另一方面,苏北地区古生界富有机质泥页岩普遍埋藏深,下古生界富有机质泥页岩成熟度普遍偏高,后期多期构造运动及岩浆活动强烈,这些因素对页岩气形成、富集及保存等有着重要影响。
Based on the data of cores, drilling and outcrops, taking the organic geochemistry and reservoir petrology as the key points, this paper analyzes the Paleozoic Cufuoshan Formation of the Lower Cambrian and the Upper Ordovician Wufeng Formation - The geological conditions for shale gas formation in three organic-rich shale formations such as the Permian, Permian, Permian (Goupong Formation, Longtan Formation and Dalong Formation) were analyzed. Three sets of organic-rich muds Shale system is widely distributed, thick, organic carbon content is high and thermal evolution is high. Compared with the typical gas-bearing shale in the United States, the abundance of organic matter in the three sets of organic-rich shale in the Paleozoic in northern Jiangsu is comparable to that in some typical areas. There is a good material foundation for the formation of shale gas in the northern part of Jiangsu Province, and there is a great potential for exploration in the Paleozoic shale gas. On the other hand, the Paleozoic organic-rich shale in northern Jiangsu Province is generally buried deep. The maturity of organic-rich shale in the Lower Paleozoic is generally high, and the multistage tectonic movement and magmatic activity are intense in the later stage. These factors affect shale gas Formation, enrichment and preservation have a significant impact.