武清凹陷石炭—二叠系烃源岩的二次生烃评价

武清凹陷石炭—二叠系烃源岩自形成以来经历了复杂的构造-埋藏历史, 并发生过多次生烃演化过程.基于详细的构造-埋藏史研究, 结合磷灰石裂变径迹测试及矿物包裹体分析, 运用EASY% R_o数值模拟技术, 深入研究了武清凹陷石炭—二叠系烃源岩的生烃演化历史, 阐明了石炭—二叠系生烃作用发生的构造期次、生烃强度, 揭示了武清凹陷石炭—二叠系烃源岩曾发生过2次重要的生烃作用过程, 分别发生在燕山期与喜山晚期, 得出了二次生烃作用主要发生在喜山晚期的主要结论.此外, 还结合有机质热解模拟量版, 定量评价了石炭—二叠系各期生烃强度, 并提出了武清凹陷是华北石炭—二叠系油气勘探的最有利地区之一. 

Evaluation of the Second Hydrocarbon-Generation of the Permo-Carboniferous Source Rocks in Wuqing Depression

After the Permo-Carboniferous source rocks formed, they have gone through complicated tectonic-burial history in Wuqing depression, and multiple hydrocarbon-generation evolution have taken place. After detailed research on tectonic-burial history, combined with the fission tracks testing and fluid inclusion analyses, using the EASY%R_o numerical simulation, the paper reveals the evolution process, the tectonic episodes and the strength of hydrocarbon-generation of Permo-Carboniferous source rocks. It comes to a conclusion that two hydrocarbon-generation processes have taken place since the Permo-Carboniferous formation, and draws an important conclusion that more hydrocarbon-generation of the Permo-Carboniferous source rocks took place in late Cenozoic. Combined with the measuring map of hydrocarbon regenerated amount & maturation of organic matter, we quantitatively evaluated the hydrocarbon-generation strength of Permo-Carboniferous source rocks in different episodes. Finally the paper brings forward that Wuqing depression is an advantageous zone for the exploration of Permo-Carboniferous oil & gas in North China.