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Effects of hydrocarbon generation on fluid flow in the Ordos Basin and its relationship to uranium mineralization

ISSN号：1000-4734
期刊名称：《矿物学报》
时间：0
分类：P618.130.2[天文地球—矿床学;天文地球—地质学] O35[理学—流体力学;理学—力学]
作者机构：[1]State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China, [2]School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China, [3]Department of Geology, University of Regina, Regina, Saskatchewan, Canada
相关基金：Acknowledgments This study was supported by NSFC （41072069, 40772061 and 40930423）, State Basic Research Plan （2009CB421005）, IRT （0755） and 111 Plan （B07011） grants to Xue and an NSERCDiscovery grant to Chi. We would like to thank Jihu Cao for assistance in the compilation of data about the Ordos Basin, especially the TOC values and kerogen types.

作者： Chunji Xue[1,2], Guoxiang Chi[3], Wei Xue[2]

关键词：鄂尔多斯盆地, 流体流动, 油气生成, 铀矿化, 天然气发电, 流体超压, 中国北方, 数值模拟, Ordos Basin, Uranium deposits, Hydrodynamics, Hydrocarbon generation, Fluid overpressure, Fluid flow, Numerical modeling

中文摘要：

诺思中国的 Ordos 盆是不仅一个重要的铀矿化作用省，而且在中国的油，气体和煤的一个主要制片人。在铀矿化作用和烃之间的基因关系被认出了由很多以前的研究，而是它很好没以盆液体的水动力学被理解流动。我们在以前的研究证明了在 Ordos 侏罗记节的上面的部分的白垩纪铀矿化作用的优先的本地化可能与在向上的流动之间的接口有关，减少液体并且向下流动，氧化液体。这个接口可能被在与不平衡沉积压缩有关的液体过压之间的相互影响控制了并且它驾驶了向上的流动，和地志的地势，它开车了向下流动。在这研究，我们执行了为对液体过压的发展的油和煤气的产生的贡献的数字建模，除了沉积压缩并且加热。当烃产生没被考虑时，我们的结果显示当烃产生被考虑时，液体过压非常与模拟比较在白垩纪期间被加倍。而且，在沉积的结束的液体过压驱散相对没有烃产生盒子慢下来。这些结果建议烃产生可能在铀矿化作用，不是仅仅在规定减少为矿化作用要求的代理人，而且在贡献驱动力维持向上的流动起了一个重要作用。

英文摘要：

The Ordos Basin of North China is not only an important uranium mineralization province, but also a major producer of oil, gas and coal in China. The genetic relationship between uranium mineralization and hydrocarbons has been recognized by a number of previous studies, but it has not been well understood in terms of the hydrodynamics of basin fluid flow. We have demonstrated in a previous study that the preferential localization of Cretaceous uranium mineralization in the upper part of the Ordos Jurassic section may have been related to the interface between an upward flowing, reducing fluid and a downward flowing, oxidizing fluid. This interface may have been controlled by the interplay between fluid overpressure related to disequilibrium sediment compaction and which drove the upward flow, and topographic relief, which drove the downward flow. In this study, we carried out numerical modeling for the contribution of oil and gas generation to the development of fluid overpressure, in addition to sedi- ment compaction and heating. Our results indicate that when hydrocarbon generation is taken into account, fluid overpressure during the Cretaceous was more than doubled in comparison with the simu- lation when hydrocarbon generation was not considered. Furthermore, fluid overpressure dissipation at the end of sedimentation slowed down relative to the no-hydrocarbon generation case. These results suggest that hydrocarbon generation may have played an important role in uranium mineralization, not only in providing reducing agents required for the mineralization, but also in contributing to the driving force to maintain the upward flow.

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