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中国海相碳酸盐台地的多台槽结构与油气生储组合

作    者:寿建峰,沈安江,李俊,吴兴宁,周进高,郑兴平
单    位:中国石油杭州地质研究院
基金项目:
摘    要:
中国大陆构造稳定性差及小型或微型板块发育的特点决定了中国海相碳酸盐台地结构的非均质性较强、台地内水体较深、处于还原或弱还原环境的台槽比较发育,从而形成了多台槽结构。台槽结构使台地的沉积格局和岩相分布变得多样,台槽的存在及槽缘礁滩的发育使台缘障壁岛后缘进一步形成次级障壁体系,包括次级障壁岛以及次级障壁岛前缘和后缘。多台槽结构有利于储集体类型的多样化,如台缘礁滩、槽缘礁滩、台内礁滩和台内白云岩潮坪、缓坡滩和钙屑浊积岩等储集体在时空上的复合-叠置。与多台槽结构有关的多级障壁岛引起的沉积环境的封闭性为障壁岛后缘的准同生白云石化作用创造了条件,由此可形成有规模的准同生白云岩,它所形成的晶间孔又为后期溶蚀提供了流体运移通道。台内高地是准同生溶蚀作用最先发生也是溶蚀最强的地区,而台槽的发育使槽缘也成为准同生溶蚀的场所,使溶蚀型储层变得更发育。多台槽结构可使烃源岩更加丰富,并可形成台缘生储组合、槽缘生储组合、台内生储组合、缓坡生储组合和斜坡-盆地生储组合等多种生储组合。除了台缘生储组合外,槽缘生储组合也是重要的油气生储组合类型。
关键词:多台槽结构;碳酸盐台地;油气生储组合;海相盆地;中国

Multitrough Configuration of Marine Carbonate Platforms and the Relative Source-Reservoir Assemblages in China

Author's Name: Shou Jianfeng, Shen Anjiang, Li Jun, Wu Xinning, Zhou Jingao, Zheng Xingping
Institution: PetroChina Hangzhou Institute of Petroleum Geology
Abstract:
The Chinese continent is characterized by weak tectonic stability and numerous small plates or microplates. which leads to heterogeneous textures of marine carbonate platforms and developing troughs in deepwater and reduced or weakly reduced environments within platforms and so it is easy to configurate the multitroughs-in-platform in marine basins. The multitrough configuration may be favorable to diversify sedimentary patterns (further to form sub-barrier systems behind platform margin barriers), lithofacies distribution and reservoir bodies (to the penecontemporaneous dissolved dolostone reservoirs behind the back margins of barrier islands). The Multirough configuration also advantages the development of source rocks and the formation of associated source-reservoir assemblages,such as the ones along platform margins, along trough margins, within platforms, in gentle slopes and in slope-to-basins. Besides the sourcereservoir assemblage along platform margins, the ones along trough margins are also significant for the hydrocarbon accumulation.
Keywords: Multi-trough configuration; Carbonate platform; Source-reservoir assemblage; Marine basin; China
投稿时间:2011-03-02  
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