渤海湾盆地辽东湾坳陷盆中隆起缓坡带重力流沉积形态及其控制因素

doi:10.11743/ogg20220407

Abstract

Abstract:

Lithologic traps formed by gravity flow deposits have gradually become the focus of hydrocarbon exploration and development. The eastern slope of Liaoxi uplift or the western slope of Liaozhong Sag is still at an early stage of exploration in the Liaodong Bay Depression， Bohai Bay Basin. A gravity flow fan of high-density turbidite nature was drilled recently in the gentle slope zone of the intra-basinal uplift and shows a potential target for future exploration of lithologic-stratigraphic reservoirs in the slope zone. In the study， a high-resolution sequence stratigraphic framework of the 3^rd member of the Paleogene Dongying Formation in the study area is established at first， followed by a comprehensive study on the geomorphology and its controlling factors of gravity flow deposits within the systems tracts based on an integrated analysis of seismic， logging， and core data. The results show that four types of slope fans are mainly developed in the gentle slope zone to the east of Liaoxi uplift， namely the ligulate fan， petal-shaped fan， lobe-shaped fan and channel-shaped fan， the morphology of which is determined by slope gradient and sand richness of gravity flow sediment sources （the distally-sourced braided river delta front）. Among others， the more complex the slope break and the steeper the slope， the larger the aspect ratio of the sublacustrine fan is， displaying in a long ligulate shape， while the simpler the slope break type and the gentler the slope， the smaller the aspect ratio of the sublacustrine fan is， displaying in a lobe shape. On the other hand， the sand richness of sediment source determines the degree of channelization of sublacustrine fan and its stability. The higher the sand richness， the lower the channel stability is， while the higher the argillaceous sediment content， the higher the channel stability is. Therefore， the steep slope rich in sand is prone to form a ligulate fan， the gentle slope rich in sand is prone to form a lobe-shaped fan， and the gentle slope rich in argillaceous sediment is prone to form a channel-shaped fan； the petal-shaped fan is but of a transitional type.

Key words: gravity flow, high-density turbidite, sedimentary morphology, sequence stratigraphy, gentle slope zone of intra-basinal uplift, Liaodong Bay Depression, Bohai Bay Basin

CLC Number:

TE121.3

Shu Jiang, Hao Wang, Tao Guo, Rucai Zhang, Xiaofeng Du, Yuying Zhang, Enhao Liu, Hua Wang. Geomorphology of gravity flow deposits in the gentle slope zone of intra-basinal high in the Liaodong Bay Depression， Bohai Bay Basin and its controlling factors[J]. Oil & Gas Geology, 2022, 43(4): 823-832.

Figures/Tables 7

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砂体形态	沉积亚相	测井相	控制因素
舌形扇	内扇：滑塌体中扇：舌形扇外扇：席状砂	舌形扇：齿化箱形	陡-富砂
朵叶扇	内扇：主供给水道中扇：朵叶体、分流水道外扇：席状砂	朵叶体：指形、齿化漏斗形	缓-富砂
花瓣扇	内扇：主供给水道中扇：瓣状体、分流水道外扇：席状砂	瓣状体：齿化漏斗形	缓-砂/泥
河道扇	内扇：主供给水道中扇：分流水道外扇：席状砂	分流河道：齿化箱形	缓-富泥

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Geomorphology of gravity flow deposits in the gentle slope zone of intra-basinal high in the Liaodong Bay Depression， Bohai Bay Basin and its controlling factors

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