“东南亚构造、沉积与资源环境效应”专辑

孟加拉扇更新统加积型深水水道规模和演化

  • 许小勇 ,
  • 张颖 ,
  • 鲁银涛 ,
  • 马宏霞 ,
  • 闫春 ,
  • 刘忻蕾 ,
  • 徐宁 ,
  • 邵大力 ,
  • 孙辉 ,
  • 丁梁波
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  • 1.中国石油杭州地质研究院, 浙江 杭州 310023
    2.华北科技学院, 河北 廊坊 065201
    3.中国石油海外勘探开发公司, 北京 100031
许小勇(1983-),男,江苏江阴人,高级工程师,主要从事深水沉积研究. E-mail:xuxy_hz@petrochina.com.cn

收稿日期: 2021-05-11

  修回日期: 2021-12-13

  网络出版日期: 2022-04-14

基金资助

国家自然科学基金项目“孟加拉湾东北部深水沉积体系发育特征与生物气成藏规律研究”(42076219);“孟加拉湾东北部沉积过程与特提斯东段构造变形耦合关系”(92055211)

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)

摘要

近年来,深水油气勘探发现的储量在全球新增储量中的占比逐年增加,2010年以来其占比已超过50%,深水已经成为未来油气勘探的重点领域。作为深水油气勘探主要储层之一的深水水道,同样成为深水油气勘探的重点研究对象。以高分辨率(40 Hz)三维地震资料为基础,对研究区内的加积型水道—天然堤复合体进行了精细刻画,着重刻画了水道—天然堤复合体内部不同期次水道的中心线,重点分析了深水水道的发育和演化特征。该水道天然堤复合体整体宽25~30 km,单期水道宽度约300 m,推测厚度约10 m。深水水道的演化整体表现为有序的发育过程,初期水道较顺直,弯曲度较低,后期弯曲度逐渐升高,晚期水道的平面形态较为稳定,变化较小。深水水道在演化过程中不仅向左右两侧迁移,同时也具有向下游方向迁移的特征;前人认为深水水道向下游迁移的现象非常罕见,但是研究表明在某些情况下,这种现象可能并不罕见。

本文引用格式

许小勇 , 张颖 , 鲁银涛 , 马宏霞 , 闫春 , 刘忻蕾 , 徐宁 , 邵大力 , 孙辉 , 丁梁波 . 孟加拉扇更新统加积型深水水道规模和演化[J]. 地球科学进展, 2022 , 37(3) : 268 -276 . DOI: 10.11867/j.issn.1001-8166.2021.047

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.

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