苏里格地区山西组烃源岩地化特征及生烃能力评价

摘要

The marine-terrigenous facies and fluvial to lacustrine delta facies are the main deposition environment in the upper Paleozoic in Sulige region of Ordos Basin. The main hydrocarbon source rocks of Shanxi group of lower Permian in Sulige areas are coals and dark mudstones. According to the residual Toc 、the Kerogen carbon isotopes、the Maceral of organic matter、Ro and other geochemical data of core samples in Sulige areas,we have systemically analyzed the organic matter abundance, type and thermal evolution degree of Shanxi group of Lower Permian. We have used the method of the hydrocarbon generation rate of organic carbon to separately calculate the hydrocarbon-generating intensity of coals and dark mudstones. On this basis and combining with the reservoir forming characteristics of Shanxi group in Sulige areas, this paper holds that the hydrocarbon generation capacity of Shanxi group had the middle or slightly low level.%鄂尔多斯盆地苏里格地区上古生界地层为海陆交互及河流～湖泊三角洲相的石炭～二叠系含煤岩系.下二叠统山西组发育煤和暗色泥岩二类烃源岩.根据苏里格及周边地区大量钻井岩芯样品的残余有机碳含量,干酪根同位素,有机质显微组份组成,干酪根镜质体反射率(Ro)等地球化学数据,综合分析了下二叠统山西组烃源岩的有机质丰度,类型和热演化程度.采用有机碳产烃率法,分别计算了煤层和暗色泥岩的生烃强度.在此基础上,结合苏里格地区山西组成藏特征,综合评价认为山西组生烃能力居于中等偏低的级别.