鄂尔多斯盆地南部延长组热水沉积作用与烃源岩发育的关系
发布时间：2018-08-03 08:38
【摘要】：鄂尔多斯盆地三叠系延长组优质烃源岩的形成可能与热流体活动密切相关,但一直缺乏直观且有效的证据支持。通过连续采样的高分辨率元素地球化学研究,结果显示延长组整体上是具有较多陆源输入的非典型热水沉积,但在长7-3段优质烃源岩沉积期热流体输入显著增强。热液指标Al/(Al+Fe+Mn)、(Fe+Mn)/Ti比值与TOC丰度之间的相关系数分别高达-0.89和0.89,表明热水沉积与烃源岩之间具有密切关系,即热液输入强度越大,烃源岩有机质丰度越高。Al/(Al+Fe+Mn)比值与P/Al、P/Ti、TS含量的相关系数分别为-0.81、-0.80和-0.89,指示热水沉积与烃源岩之间存在的关系可能缘于热水活动能够促进湖面古生产力的提高和底水缺氧环境的形成,在烃源岩发育过程中提供充足的有机质来源和良好的有机质保存条件。研究表明,热水沉积是潜在的富有机质烃源岩,元素定量指标相关性分析是揭示两者之间关系的一种有效途径。
[Abstract]:The formation of high quality source rocks of the Triassic Yanchang formation in Ordos Basin may be closely related to the thermal fluid activity, but there is a lack of direct and effective evidence. Through the continuous sampling of high resolution element geochemistry, the results show that the Yanchang formation is an atypical hot water deposit with more terrestrial inputs, but the thermal fluid input increased significantly during the sedimentary period of the high quality hydrocarbon source rocks of the Chang 7-3 member. The correlation coefficients between hydrothermal index Al/ (Al Fe Mn), (Fe Mn) / Ti ratio and TOC abundance are as high as -0.89 and 0.89 respectively, which indicates that hydrothermal deposition has a close relationship with source rock, that is, the greater the hydrothermal input intensity, The higher the organic matter abundance of source rocks, the higher the ratio of 路Al / (Al Fe Mn) and the correlation coefficient of P / AlP / TiTs content are -0.81- 0.80 and -0.89respectively, indicating that the relationship between hot water deposition and source rocks may be due to the hot water activity can promote the improvement of paleoproductivity and the bottom of the lake surface. The formation of anoxic water environment, Adequate organic matter sources and good preservation conditions are provided during the development of source rocks. The results show that hot water deposition is a potential source rock with rich organic matter and the correlation analysis of element quantitative indexes is an effective way to reveal the relationship between them.
【作者单位】： 中国科学院地质与地球物理研究所油气资源研究重点实验室;甘肃省油气资源研究重点实验室;中国科学院大学;中国地质大学(武汉)构造与油气资源教育部重点实验室;中国石油长庆油田分公司勘探开发研究院;低渗透油气田勘探开发国家工程实验室;
【基金】：中国科学院战略性先导科技专项(XDB10010103) 国家自然科学基金项目(41172131,41672137) 甘肃省重点实验室专项(1309RTSA041)
【分类号】：P618.13
，
本文编号：2161196
[Abstract]:The formation of high quality source rocks of the Triassic Yanchang formation in Ordos Basin may be closely related to the thermal fluid activity, but there is a lack of direct and effective evidence. Through the continuous sampling of high resolution element geochemistry, the results show that the Yanchang formation is an atypical hot water deposit with more terrestrial inputs, but the thermal fluid input increased significantly during the sedimentary period of the high quality hydrocarbon source rocks of the Chang 7-3 member. The correlation coefficients between hydrothermal index Al/ (Al Fe Mn), (Fe Mn) / Ti ratio and TOC abundance are as high as -0.89 and 0.89 respectively, which indicates that hydrothermal deposition has a close relationship with source rock, that is, the greater the hydrothermal input intensity, The higher the organic matter abundance of source rocks, the higher the ratio of 路Al / (Al Fe Mn) and the correlation coefficient of P / AlP / TiTs content are -0.81- 0.80 and -0.89respectively, indicating that the relationship between hot water deposition and source rocks may be due to the hot water activity can promote the improvement of paleoproductivity and the bottom of the lake surface. The formation of anoxic water environment, Adequate organic matter sources and good preservation conditions are provided during the development of source rocks. The results show that hot water deposition is a potential source rock with rich organic matter and the correlation analysis of element quantitative indexes is an effective way to reveal the relationship between them.
【作者单位】： 中国科学院地质与地球物理研究所油气资源研究重点实验室;甘肃省油气资源研究重点实验室;中国科学院大学;中国地质大学(武汉)构造与油气资源教育部重点实验室;中国石油长庆油田分公司勘探开发研究院;低渗透油气田勘探开发国家工程实验室;
【基金】：中国科学院战略性先导科技专项(XDB10010103) 国家自然科学基金项目(41172131,41672137) 甘肃省重点实验室专项(1309RTSA041)
【分类号】：P618.13
，
本文编号：2161196
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