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Sedimentology and mechanism of a lacustrine syn-rift fan delta system: A case study of the Paleogene Gaobei Slope Belt, Bohai Bay Basin, China

机译：湖泊沉积物粉丝系统的沉积学与机制：古琴高博坡带，渤海湾盆地

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摘要

Fan delta systems have long been studied as a kind of good hydrocarbon reservoirs. Although many models have been raised according to their local conditions, there still exists some controversies regarding the formations of the ones developed in continental syn-rift settings. Taking Paleogene Es-3(2+)3 of Gaobei Slope Belt as an example, this paper conducted a comprehensive geological study and a forward depositional modeling. The results show that the sediment within the study area came mainly from the northeastern Baigezhuang uplift and the north-western Xinanzhuang uplift over a short distance. The sedimentary system is characterized by subaerial debris flow, subaerial braided channels, subaqueous distributary channels, front sand bars and front sand sheets. Furthermore, the study area is a balance-filled basin that experienced a 3rd order normal regression followed by a transgression during the development of the study interval. The results also show that, a stable subsidence rate with small-magnitude climate changes would be a plausible explain for the entire sequence of the fan delta system in the study area. The tectonic subsidence was indeed the dominant driving force to a continental syn-rift fan delta system, although the climate, sediment supply or lake level might bring some lower order (e.g., 4th and 5th order) superimpositions. This paper proposed a likely model for fan deltas developed in continental syn-rift settings, which is expected to gain some insights into the forming mechanism and provide some supports for the reservoir characterization of similar and correlative sedimentary systems.
机译：粉丝三角洲系统已经被研究为一种好的碳氢化合物储层。虽然根据当地的情况提出了许多模型，但仍然存在有关在大陆同步设置中开发的模板的一些争议。以古代ES-3（2+）3为例，是本文进行了全面的地质研究和前瞻性沉积建模。结果表明，研究区域内的沉积物主要来自东北百岛隆隆，南北西南庄隆起在短距离。沉积体系的特征在于皮下碎片流动，骨髓编织通道，水分布通道，前砂杆和前砂板。此外，研究区是一个平衡填充的盆地，其经历了第三顺序正常回归，然后在研究间隔开发期间进行违规。结果还表明，具有小幅度气候变化的稳定沉降率将是研究区内风扇三角洲系统的整个序列的合理解释。构造沉降确实是大陆同步风扇三角洲系统的主导驱动力，尽管气候，沉积物供应或湖泊等级可能会带来一些较低的顺序（例如，第4和第5顺序）叠加。本文提出了在大陆同步环境中开发的粉丝三角洲的可能模型，预计将对成形机制进行一些见解，并为类似和相关沉积系统的储层表征提供一些支持。

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