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Advances in Earth Science >

2022 , Vol. 37 >Issue 3: 268 - 276

DOI: https://doi.org/10.11867/j.issn.1001-8166.2021.047

Scale and Evolution of the Pleistocene Aggradational Channels in the Bangle Fan

  • Xiaoyong XU ,
  • Ying ZHANG ,
  • Yintao LU ,
  • Hongxia MA ,
  • Chun YAN ,
  • Xinlei LIU ,
  • Ning XU ,
  • Dali SHAO ,
  • Hui SUN ,
  • Liangbo DING
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  • 1.PetroChina Hangzhou Research Institute of Geology，Hangzhou 310023，China
    2.North China Institute of Science and Technology，Langfang Hebei 065201，China
    3.China National Oil and Gas Exploration and Development Corporation，Beijing 100031，China
XU Xiaoyong (1983-), male, Jiangyin City, Jiangsu Province, Senior Engineer. Research areas include deep-water deposition. E-mail: xuxy_hz@petrochina.com.cn

Received date: 2021-05-11

  Revised date: 2021-12-13

  Online published: 2022-04-14

Supported by

the National Natural Science Foundation of China "Research on characteristics of deep-water sedimentary system and biogenic gas petroleum play in the northeast of bengal fan"(42076219);"Coupling relationship between sedimentary process and tectonic deformation of northeastern Bay of Bengal,an Eastern Tethys section"(92055211)

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Abstract

Recently， the proportion of deep-water incremental reserves has increased gradually each year. This proportion has exceeded 50% since 2010. Deepwater environments have become a key area of future oil and gas exploration. As one of the main reservoirs for deep-water oil and gas exploration， deep-water channels have attracted increasingly more attention. Based on high-resolution （40 Hz） 3D seismic data， this study carried out a detailed description of an aggradational channel-levee complex in the study area. The centerlines of the different channels in the complex were recognized from bottom to top. The overall width of this channel-levee complex is 25~30 km. The width of the single-channel is about 300 m， and the thickness is estimated to be 12 m. The channel morphology of this complex shows an organized evolution. The channel was relatively straight with low curvature at the beginning of aggradation， and the curvature gradually increases over time. During aggradation， the deep-water channels not only swing but also sweep downstream. Predecessors believed that downstream sweep is very rare in deep-water channels； however， our research shows that this phenomenon may be common under some special conditions.

Key words： Bengal fan; Pleistocene; Deep-water; Channel centerline; Channel evolution

Cite this article

Xiaoyong XU , Ying ZHANG , Yintao LU , Hongxia MA , Chun YAN , Xinlei LIU , Ning XU , Dali SHAO , Hui SUN , Liangbo DING . Scale and Evolution of the Pleistocene Aggradational Channels in the Bangle Fan[J]. Advances in Earth Science, 2022 , 37(3) : 268 -276 . DOI: 10.11867/j.issn.1001-8166.2021.047

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