石油勘探与开发 >

2018 , Vol. 45 >Issue 1: 27 - 39

DOI: https://doi.org/10.11698/PED.2018.01.03

油气勘探

陆缘地壳强烈拆离薄化作用下的油气地质特征——以南海北部陆缘深水区白云凹陷为例

  • 庞雄 ,
  • 任建业 ,
  • 郑金云 ,
  • 刘军 ,
  • 于鹏 ,
  • 柳保军
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  • 1. 中海石油（中国）有限公司深圳分公司,广东深圳 518054
    2. 中海石油深海开发有限公司,广东深圳 518054
    3. 中国地质大学（武汉）构造与油气资源教育部重点实验室,武汉 430074
    4. 同济大学海洋地质国家重点实验室,上海200092
庞雄（1962-）,男,广西玉林人,学士,中海石油（中国）有限公司深圳分公司教授级高级工程师,主要从事珠江口盆地深水油气勘探研究。地址：广东省深圳市南山区后海滨路（深圳湾段）3168号海洋石油大厦A座,中海石油（中国）有限公司深圳分公司研究院,邮政编码：518054。E-mail: pangxiong@cnooc.com.cn

收稿日期: 2017-08-25

  修回日期: 2017-11-15

  网络出版日期: 2017-12-11

基金资助

国家科技重大专项（2011ZX05025-003,2016ZX05026-003）; 国家自然科学基金重点项目（91128207）; 中海石油有限公司科技项目（YXKY-2012-SHENHAI-01）

收起

Petroleum geology controlled by extensive detachment thinning of continental margin crust: A case study of Baiyun sag in the deep-water area of northern South China Sea

  • PANG Xiong ,
  • REN Jianye ,
  • ZHENG Jinyun ,
  • LIU Jun ,
  • YU Peng ,
  • LIU Baojun
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  • 1. CNOOC Ltd.-Shenzhen, Shenzhen 518054, China
    2. CNOOC Ltd.-Deepwater, Shenzhen 518054, China
    3. Faculty of Marine Science and Technology, China University of Geosciences (Wuhan), Wuhan 430074, China
    4. Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China

Received date: 2017-08-25

  Revised date: 2017-11-15

  Online published: 2017-12-11

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摘要

综合利用重力、磁力、三维地震、海底地震和深水油气探井、南海大洋钻探井等资料,开展了陆缘地壳伸展薄化与白云深水区凹陷结构、构造及油气地质之间关系的研究。研究表明,深水区裂陷期经历了早期上地壳脆性伸展高角度断裂控制的箕状半地堑断陷、中期地壳脆韧性差异伸展低角度拆离断裂控制的宽深断陷、晚期以韧性地壳流变为主的碟形断坳盆地演化过程;受穿过地壳的大型拆离断裂控制而发育的宽深断陷是深水区盆地结构的重要特征。陆缘地壳强烈拆离薄化形成的白云凹陷宽深断陷为大型三角洲—湖相沉积体系和规模烃源岩的发育提供了可容空间;陆缘岩石圈薄化程度的差异导致了裂后拗陷期热沉降差异,进而控制了拗陷期陆架坡折带的发育和深水储集层沉积环境;岩石圈强烈薄化、幔源上升导致的高热流背景,使得深水区的储集层成岩作用、烃源岩成烃过程和油气成藏条件具有特殊性。图10参51

关键词： 南海北部; 珠江口盆地; 白云凹陷; 深水区; 陆缘地壳; 拆离断层; 宽深断陷; 陆架坡折带; 油气地质

本文引用格式

庞雄 , 任建业 , 郑金云 , 刘军 , 于鹏 , 柳保军 . 陆缘地壳强烈拆离薄化作用下的油气地质特征——以南海北部陆缘深水区白云凹陷为例[J]. 石油勘探与开发, 2018 , 45(1) : 27 -39 . DOI: 10.11698/PED.2018.01.03

Abstract

The relationships between crustal stretching and thinning, basin structure and petroleum geology in Baiyun deep-water area were analyzed using large area 3D seismic, gravity, magnetic, ocean bottom seismic (OBS), deep-water exploration wells and integrated ocean drilling program (IODP). During the early syn-rifting period, deep-water area was a half-graben controlled by high angle faults influenced by the brittle extension of upper crust. In the mid syn-rifting period, this area was a broad-deep fault depression controlled by detachment faults undergone brittle-ductile deformation and differentiated extension in the crust. In the late syn-rifting period, this area experienced fault-sag transition due to saucer-shaped rheology change dominated by crustal ductile deformation. A broad-deep fault depression controlled by the large detachment faults penetrating through the crust is an important feature of deep-water basin. The study suggests that the broad-deep Baiyun sag provides great accommodation space for the development of massive deltaic-lacustrine deposition system and hydrocarbon source rocks. The differentiated lithospheric thinning also resulted in the different thermal subsidence during post-rifting period, and then controlled the development of continental shelf break and deep-water reservoir sedimentary environment. The high heat flow background caused by the strong thinning of lithosphere and the rise of mantle source resulted in particularities in the reservoir diagenesis, hydrocarbon generation process and accumulation of deep-water area in northern South China Sea.

Key words： northern South China Sea; Zhujiangkou Basin; Baiyun sag; deep-water area; continental margin crust; detachment fault; broad-deep fault depression; continental shelf break; petroleum geology

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