中国石油勘探 ›› 2018, Vol. 23 ›› Issue (5): 28-36.DOI: 10.3969/j.issn.1672-7703.2018.05.004

• 石油地质 • 上一篇    下一篇

南海北部超深水区兴宁—靖海凹陷中—新生代构造演化及其油气勘探意义

杨东升, 赵志刚, 杨海长, 曾清波, 纪沫, 黄萱   

  1. 中海油研究总院有限责任公司
  • 收稿日期:2017-04-18 修回日期:2018-06-17 出版日期:2018-09-15 发布日期:2018-09-15
  • 基金资助:
    国家科技重大专项“南海深水区油气资源潜力与大中型油气田勘探方向”(2016ZX05026007);国家自然科学基金重大研究计划“南海深海地质演变对油气资源的控制作用”(91528303)。

Mesozoic-Cenozoic tectonic evolution and its oil and gas exploration significance in Xingning-Jinghai sag in ultra-deep water area, northern South China Sea

Yang Dongsheng, Zhao Zhigang, Yang Haizhang, Zeng Qingbo, Ji Mo, Huang Xuan   

  1. CNOOC Research Institute Co., Ltd.
  • Received:2017-04-18 Revised:2018-06-17 Online:2018-09-15 Published:2018-09-15
  • Supported by:
     

摘要: 兴宁—靖海凹陷是南海北部超深水区洋陆过渡壳上的中—新生代叠合凹陷,是南海北部以中生界为目的层的油气勘探新领域。利用二维、三维地震资料联合精细解释,综合分析了兴宁—靖海凹陷的中—新生代凹陷结构特征、构造演化史和烃源岩特征。研究认为:兴宁—靖海凹陷中—新生代经历了中生代坳陷挤压剥蚀期、新生代以来的伸展断陷期和热沉降坳陷期三大构造演化阶段。受构造演化控制,兴宁—靖海凹陷发育三叠系、侏罗系及白垩系3套中生界烃源岩,海相泥岩是主力烃源岩;发育2套有利储盖组合,即中生界侏罗系与白垩系滨浅海相、滨浅湖相砂泥岩互层构成的储盖组合,以及新生界恩平组滨浅海相、三角洲相砂岩与珠海组海相泥岩构成的储盖组合;形成多种类型的圈闭,近凹圈闭带是有利勘探区带。

 

关键词: 南海北部超深水区, 兴宁-靖海凹陷, 构造演化, 凹陷结构, 中生界

Abstract: The Xingning-Jinghai sag is a Mesozoic-Cenozoic superimposed sag lying at the ultra-deep water transitional crust, and a new Mesozoic oil and gas exploration target in northern South China sea. Based on fine interpretation of 2D and 3D seismic data, the structural characteristics, structural evolution history and source rocks feature of the Mesozoic-Cenozoic sag are analyzed comprehensively. The study results show that the Xingning-Jinghai sag has gone through three tectonic evolution stages:the Mesozoic compression and denudation, the stretching rift and thermal subsidence since the Cenozoic. Under the control of the structural evolution, three sets of Mesozoic source rocks, the Triassic, Jurassic and Cretaceous, are developed, of which the Mesozoic marine mudstone is dominant; two sets of favorable reservoir-caprock assemblages are formed:one is the Jurassic and Cretaceous shallow marine and lacustrine sandstone-mudstone interlayers, and the other is the Cenozoic Enping Formation shallow marine and delta sandstone and the Zhuhai Formation marine mudstone; and several types of traps are developed, of which the traps near the sag are favorable exploration targets.

Key words: ultra-deep water area in northern South China Sea, Xingning-Jinghai sag, structural evolution, sag structure, Mesozoic

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