太康隆起和周口坳陷上古生界煤系烃源岩地球化学特征
Geochemical Characteristics of the Upper Paleozoic Source Rocks in Taikang Rise and Zhoukou Depression
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摘要: 通过岩石热解和有机地球化学资料,对太康隆起和周口坳陷的有机质类型、有机质丰度和有机质成熟度综合分析。结果认为,研究区有机质丰度以煤岩最好,暗色泥岩以南部的襄城、谭庄-沈丘和倪丘集为中等-好级别,北部的太康隆起和鹿邑凹陷为差-中等烃源岩;太康隆起上古生界和襄城凹陷太原组为型干酪根,其他地区则为典型的腐殖型(型)干酪根;成熟度总体上呈“北高南低”,并以济源-郑州-太康-鹿邑一线为高-过成熟演化区,生气为主,南部的襄城、谭庄-沈丘和倪丘集处于成熟生油阶段。Abstract: By data of source rocks pyrolysis and organic geochemistry,type and abundance of organic substance,and maturity of organic substance have been systemically studied.It is indicated that coal is the best hydrocrabon source rock in the study area.The dark mudstone in the Xiang cheng,Tanzhuang-Shenqiu and Niqiuji depression to the south are "middle-good" class,the Taikang rise and Luyi depression to the north are "middle-bad" class; The upper Paleozoic source rocks in the Taikang rise and Taiyuan formation source rocks belong to Ⅱ kerogan,the other areas are Ⅲ kerogen; The overall maturity displays a pattern of higher in the north and lower in the south,and the Jiyuan,Zheng zhou,Taikang and Luyi areas are in a over-maturity stage which mainly generates gas,while the Xiangcheng,Tanzhuang -Shenqiu and Niqiuji depressions are in maturity stage which produces oil.
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