Evaluation of the Second Hydrocarbon-Generation of the Permo-Carboniferous Source Rocks in Wuqing Depression
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摘要: 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% Ro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.Abstract: 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% Ro 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 quanti-tatively 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.
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图 1 武清凹陷构造简图
a.渤海湾盆地略图; 1.冀中坳陷; 2.沧县隆起; 3.黄骅坳陷; 4.渤中隆起; 5.埕宁隆起; 6.济阳坳陷; 7.郯庐断裂; 8.东濮-临清坳陷; 9.辽河坳陷
Fig. 1. Tectonic sketch map of Wuqing depression
图 2 系列样品热解二次生烃迟滞性定量评价参数演化
a.绝对迟滞性; b.相对迟滞性
Fig. 2. Evolvement of parameters for quantitative evaluation of hyrocarted lagging of coal sample series
图 3 Ⅲ型干酪根有机质二次生烃总量/有机质成熟度量版
Fig. 3. Measuring map of hydrocarbon regenerated amount & maturation of the third type kerogen in organic matter
图 5 渤海湾盆地古地热场演化模式
Fig. 5. Evolvement patterns of paleogeothermics field in Bohai Gulf basin
图 7 武清凹陷太原组有机质成熟度演化曲线
Fig. 7. Evolutional curves of maturity of Taiyuan Formation in Wuqing depression
图 8 武清凹陷上石炭统太原组底成熟度分布
Fig. 8. Maturity distribution maps of the Upper Carboniferous Taiyuan Formation bottom in Wuqing depression
图 9 武清凹陷上石炭统太原组二次生烃量分布
Fig. 9. Distribution maps of the second hydrocarbon-generation quantities of the Upper Carboniferous Taiyuan Formation in Wuqing depression
表 1 武清坳陷代表井的磷灰石裂变径迹表观年龄和平均径迹长度
Table 1. Ages and average lengths of fission tracks in several wells in Wuqing depression
表 2 武清凹陷脉体矿物流体包裹体研究成果及其所反映的古地热史
Table 2. Researched results and paleogeothermics history of fluid inclusion in calcite arterite in Wuqing depression
表 3 武清凹陷苏50井石炭系烃源岩的EASY%Ro数值模拟
Table 3. EASY%Ro numerical simulation results of the Carboniferous source rocks in Su-50 well in Wuqing depression
表 4 武清凹陷苏50井上石炭统太原组二次生烃综合评价结果
Table 4. Comprehensive evaluation results of the second hydrocarbon-generation of the Carboniferous Taiyuan Formation in Su-50 well in Wuqing depression
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