Sequence boundary and petroleum geology of the Cambrian-Permian strata in the Ordos Basin
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摘要: 在鄂尔多斯盆地寒武系-二叠系地层中识别出不整合面、渣状层、古喀斯特作用面、冲刷侵蚀面、岩性与岩相转换面、超覆面、最大海泛面等层序界面。在详细讨论各类型界面特征的基础上,将其成因划分为构造运动造山侵蚀不整合界面、升隆侵蚀不整合界面、海侵上超层序不整合界面、暴露不整合界面4种类型。层序界面不仅是层序划分的关键,同时也具有重要的油气地质意义。层序界面是盆地盆地构造演化的物质响应,同时也是形成优质储集空间和油气运聚通道的重要地质条件。Abstract: In the light of field outcrop profiles, well logs and geophysical data, seven types of sequence boundary in the Cambrian-Permian strata in the Ordos Basin have been distinguished, including unconformity, scoriaceous beds, palaeokarst surface, scour surface, lithology-lithofacies boundary, onlap surface and maximum flooding surface, which may be genetically grouped into four categories:orogeny-associated unconformity, uplifting-associated unconformity, transgressive onlap-associated unconformity and exposure unconformity. These sequence boundaries not only serve as the key of the sequence division but also have important petroleum geological implications. They are interpreted as the responses to the tectonic evolution of the basin, and also as the important geological conditions for the formation of high-quality reservoir spaces and hydrocarbon migration channels.
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