鄂尔多斯盆地中元古界烃源岩热演化史模拟

发布时间：2018-05-26 16:51

本文选题：热史模拟 + 镜质体反射率　；参考：《石油实验地质》2017年04期

【摘要】：鄂尔多斯盆地中元古界是中国石油长庆油田天然气增储上产的潜在层系,然而长期以来对其内烃源岩热演化史一直缺乏深入研究。以Petro Mod盆地模拟软件为工具,在对区内各构造单元岩性、剥蚀厚度、古大地热流值等模拟参数分析的基础上,以实测镜质体反射率(Ro)作为约束,对区内各构造单元中元古界进行热史模拟,分析不同构造单元烃源岩热演化的差异性,并结合含油气系统分析,对有利的勘探区进行了预测。结果表明:(1)盆地中元古代拗拉槽及周缘中元古界烃源岩进入生烃门限时间明显较早;除西缘冲断带中北部之外,其他拗拉槽及周缘处烃源岩各阶段成熟时间也早于其他地区,现今处于生干气阶段;除伊盟隆起地区长城系烃源岩成熟期次都较晚、现今仍处于生湿气阶段外,其他地区基本上于晚二叠世晚期进入生烃门限,现今处于生干气阶段;蓟县系烃源岩于晚二叠世晚期—中三叠世早期先后进入生烃门限,随后受盆地沉积中心不断向西迁移和天环向斜北部、渭北隆起西部早白垩世岩浆岩的侵入影响,烃源岩成熟加快,早白垩世先后进入生干气阶段。(2)渭北隆起中部、天环向斜南部、伊陕斜坡西北部、伊盟隆起中部为有利勘探区,是下一步开展研究的重点区域。
[Abstract]:The Mesoproterozoic in Ordos Basin is a potential formation for natural gas accumulation and production in CNPC Changqing Oilfield. However, the thermal evolution history of source rocks in the Ordos Basin has not been thoroughly studied for a long time. Based on the analysis of lithology, denudation thickness and paleogeodetic heat flux of various tectonic units in the Petro Mod basin simulation software, the measured vitrinite reflectance is taken as the constraint. The thermal history of the Proterozoic in each tectonic unit in the area is simulated, and the difference of thermal evolution of hydrocarbon source rocks in different structural units is analyzed. The favorable exploration area is predicted by combining the analysis of oil-bearing system. The results show that the Mesoproterozoic Sao-pull trough and the peripheral Middle Proterozoic source rocks entered the hydrocarbon generation threshold obviously earlier, except for the central and northern parts of the western margin thrust belt, the maturation time of the source rocks in the other recalcitrant and peripheral areas was earlier than that in other regions. With the exception of the Great Wall source rocks in the Yimeng uplift region, the maturation stage is relatively late and is still in the wet gas generation stage. The other areas basically entered the hydrocarbon generation threshold in the late Permian and are now in the dry gas generation stage. The source rocks of Jixian system entered the hydrocarbon generation threshold successively in the late Permian to the early Middle Triassic, and were subsequently influenced by the continuous westward migration of the sedimentary center of the basin and the intrusion of the northern Tianhuan syncline and the early Cretaceous magmatic rocks in the western Weibei uplift. The maturation of the source rocks accelerated, and the early Cretaceous entered into the stage of gas generation and dry gas successively) the central part of Weibei uplift, the south of Tianhuan syncline, the northwest of Yi-shan slope and the central part of Yi-shan uplift are the favorable exploration areas, which are the key areas for further research.
【作者单位】：西安石油大学地球科学与工程学院;
【基金】：构造地质与油气资源教育部重点实验室基金项目(TRR-2012-20)资助
【分类号】：P618.13

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