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OALib Journal期刊
ISSN: 2333-9721
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辽河坳陷东部凹陷沙三段页岩油气成藏地质条件
Keywords: 页岩气,辽河坳陷东部凹陷,沙三段,地球化学特征,含气性,有利区
Abstract:
？从辽河坳陷东部凹陷的构造演化入手，通过对沙三段页岩的沉积地质背景、地球化学特征、储集特征及含气性特征等方面分析页岩油气的成藏条件，初步探讨了辽河坳陷东部凹陷沙三段页岩油气的成藏模式，并优选出页岩油气的勘探有利区。结果表明：东部凹陷沙三段发育一套湖相暗色页岩，页岩厚度较大，一般介于100～500m之间|有机碳含量在0.1%～6%之间，平均值达2.91%；有机质热成熟度ro值较低，平均值为0.6%，属于低成熟—成熟有机质|储集空间以粒间孔和溶蚀孔为主，石英、碳酸盐类等脆性矿物含量较高，具有一定的脆性|页岩的含气性较好，等温吸附测试表明吸附气量在0.65～5.11m3/t之间，平均为2.32m3/t。通过页岩油气成藏条件多因素叠加法，认为北部的牛居—长滩洼陷和南部的驾掌寺—二界沟洼陷是东部凹陷沙三段页岩油气勘探有利区。
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