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首页> 外文期刊>Journal of Asian earth sciences >Classification of gravity-flow deposits and their significance for unconventional petroleum exploration, with a case study from the Triassic Yanchang Formation (southern Ordos Basin, China)
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Classification of gravity-flow deposits and their significance for unconventional petroleum exploration, with a case study from the Triassic Yanchang Formation (southern Ordos Basin, China)

机译：重力流沉积物的分类及其对非常规石油勘探的意义-以三叠系延长组（中国鄂尔多斯盆地南部）为例

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摘要

The ongoing exploration for shale oil and gas has focused sedimentological research on the transport and deposition mechanisms of fine-grained sediments, and more specifically on fine-grained mass-flow deposits. It appears, however, that no easily applicable classification scheme for gravity-flow deposits exists, and that such classifications almost exclusively deal with sandy and coarser sediments. Since the lack of a good classification system for fine-grained gravity flow deposits hampers scientific communication and understanding, we propose a classification scheme on the basis of the mud content in combination with the presumed transport mechanism. This results in twelve types of gravity-flow deposits. In order to show the practical applicability of this classification system, we apply it to the Triassic lacustrine Yanchang Formation in the southern Ordos Basin (China), which contains numerous slumps, debris-flows deposits, turbidites and hyperpycnites. The slumps and debrites occur mostly close to a delta front, and the turbidites and hyperpycnites extend over large areas from the delta slopes into the basin plain.
机译：正在进行的对页岩油气的勘探已将沉积学研究的重点放在了细颗粒沉积物的运移和沉积机理上，尤其是细颗粒质量流沉积物上。但是，似乎不存在适用于重力流沉积物的容易应用的分类方案，并且这种分类几乎专门针对沙质和较粗的沉积物。由于缺乏良好的细颗粒重力流沉积物分类系统，妨碍了科学的交流和理解，因此我们提出了一种基于泥浆含量并结合推测的输送机制的分类方案。这导致了十二种重力流沉积物。为了显示该分类系统的实际适用性，我们将其应用于鄂尔多斯盆地（中国）南部的三叠系湖相延长组，该盆地含有大量的塌陷，泥石流沉积物，浊质岩和高辉石岩。塌陷和碎屑大多发生在三角洲前缘，而浊积岩和高辉石岩则从三角洲斜坡一直延伸到盆地平原。

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