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Seismic geomorphology, architecture and genesis of unusual confined and semiconfined sedimentary units on the northern slope of the Bonan uplift, Bohai Bay Basin, China
Journal of Petroleum Science and Engineering ( IF 5.168 ) Pub Date : 2020-07-26 , DOI: 10.1016/j.petrol.2020.107696
Sen Li , Hongtao Zhu , Xianghua Yang , Changgui Xu

Studying the fundamental influence of basin-floor topography on the growth and morphology of sedimentary systems has largely focused on submarine fans; however, in lacustrine settings, only a limited number of studies are primarily concerned with confined sublacustrine fans, although such fans can form high-quality hydrocarbon reservoirs. By using recently acquired three-dimensional seismic data, a series of unusual confined and semiconfined sedimentary units with seismic reflection patterns different from those of previous studies have been identified. The identified sedimentary units are developed in the Paleogene succession on the northern slope of the Bonan uplift, Bohai Bay Basin, China, and are characterized by either vermicular-like chaotic progradational reflections or coupled vermicular-like and progradational seismic reflections in the dip direction and channel-shaped bidirectional onlap reflections along strike directions. Through restored paleogeomorphology, six elongate incised valleys (V-1 to V-6) with diverse scales on the uplift slope are clearly documented. The identified sedimentary units were deposited within these incised valleys. The units identified in this study are considered “confined” or “semiconfined” based on the following several aspects, they: 1) were deposited within elongate depocenters along dip directions; 2) are clearly separated from each other by topographic highs along strike directions; 3) have belt-shaped sediment dispersal patterns in planar view; and 4) have the thickest deposits primarily distributed in the middle and distal parts. Through comparing sedimentary landforms, feeder systems, seismic reflection characteristics and spatial distribution patterns between sedimentary systems, the confined and semiconfined systems identified in this study display both similarities to and profound differences from previously studied confined sublacustrine fans and are here considered a new unusual type. We anticipate this work may serve as a useful reference for confined sedimentary system research in other types of sedimentary basins.



中文翻译:

渤海湾盆地博南隆起北坡异常罕见的承压和半承压沉积单元的地震地貌,构造和成因

研究盆底地形对沉积系统的生长和形态的基本影响主要集中在海底扇上。然而,在湖泊环境中,虽然有限的研究可以形成高质量的油气藏,但只有有限的研究主要涉及密闭的湖底扇。通过使用最近获得的三维地震数据,已经确定了一系列具有不同于以往研究的地震反射模式的异常局限和半局限沉积单元。在渤海湾盆地博南隆起北坡古近纪演替过程中,已确定了沉积单元,它们的特征是在蠕动方向上呈蠕虫状的混沌渐进反射或耦合的蠕虫状和渐进式地震反射,以及沿走向的通道状双向重叠反射。通过恢复古地貌,清楚地记录了在隆起斜坡上六个尺度不同的细长切谷(V-1至V-6)。确定的沉积单元沉积在这些切开的山谷中。根据以下几个方面,本研究中确定的单位被认为是“密闭的”或“半密闭的”:1)沿浸没方向沉积在细长的沉积中心内;2)沿罢工方向明显被地形高点隔开;3)在平面图中具有带状的沉积物分散图案;和4)具有最厚的沉积物,主要分布在中部和远端。通过比较沉积地貌,支线系统,地震反射特征和沉积系统之间的空间分布格局,本研究确定的局限和半局限系统与以前研究的局限湖底扇形结构既有相似之处,也有深刻差异,在这里被认为是一种新的异常类型。我们预计这项工作可以为其他类型沉积盆地的受限沉积系统研究提供有用的参考。本研究中确定的密闭和半密闭系统与以前研究的密闭湖底扇形系统既有相似之处,也有深远的区别,在这里被认为是一种新的异常类型。我们预计这项工作可以为其他类型沉积盆地的受限沉积系统研究提供有用的参考。本研究中确定的密闭和半密闭系统与以前研究的密闭湖底扇形系统既有相似之处,也有深远的区别,在这里被认为是一种新的异常类型。我们预计这项工作可以为其他类型沉积盆地的受限沉积系统研究提供有用的参考。

更新日期:2020-07-26
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