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天然气地球科学

• 天然气地质学 • 上一篇    下一篇

琼东南盆地深水区宝南断阶带断裂特征及天然气地质意义

周杰，朱继田，杨金海，江汝锋，张焱，甘军,孙志鹏   

  1. 中海石油（中国）有限公司湛江分公司，广东 湛江 524057
  • 收稿日期:2016-04-06 修回日期:2017-07-08 出版日期:2018-01-10 发布日期:2018-01-10
  • 作者简介:周杰（1988-），男，湖北钟祥人，工程师，硕士，主要从事南海西部油气地质综合研究.E-mail:zhoujie14@cnooc.com.cn.
  • 基金资助:


    国家科技重大专项子课题“琼东南盆地深水区大中型气田形成条件及勘探关键技术”（编号：2016ZX05026-002）资助.

Characteristics of faults and their implication to gas geology in Baonan step-fault zone in deep-water area of Qiongdongnan Basin

Zhou Jie，Zhu Ji-tian，Yang Jin-hai，Jiang Ru-feng，Zhang Yan，Gan Jun,Sun Zhi-peng   

  1. Zhanjiang Branch of China National Offshore Oil Corporation (CNOOC) Limited，Zhanjiang 524057，China
  • Received:2016-04-06 Revised:2017-07-08 Online:2018-01-10 Published:2018-01-10

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摘要：

利用新三维地震资料，相干切片等技术对琼东南盆地深水区宝南断阶带断裂进行了精细解释；结合区域构造特征，对宝南断阶带断裂形态、断裂活动性进行了分析，并探讨了断裂对天然气成藏的控制作用，分析了其地质意义。结果表明，宝南断阶带断裂平面上以NWW_SEE向为主，主要呈平行状或网状,剖面上共发育3组构造断裂，主要呈顺向断阶状样式；断裂主要为3期活动：①始新世—早渐新世、②晚渐新世早中期、③早中新世；宝南断阶带断裂控制了宝岛凹陷南部烃源岩的形成与演化，控制了陵水组、三亚组砂体空间展布和构造圈闭的形成，同时为主要的油气垂向运移通道。并结合油气生排烃史、圈闭形成史，认为断裂活动与油气成藏的匹配关系良好。在此研究的基础上，提出2个有利勘探层系。

关键词: 琼东南盆地, 深水区, 断裂, 天然气勘探

Abstract:

The faults in the Baonan step-fault zone are described by using new high density 3D seismic data and coherence technique.A detailed study of fault morphology and fault activity in Baonan step-fault zone of deep-water area in Qiongdongnan Basin was carried out based on the regional structural characteristics.The controlling function of faults on natural gas accumulation is researched in this study.The results showed that the combination type of fault is parallel-aligned and grid-type which are mainly in NWW-SEE direction.Three groups of faults were recognized in the seismic sections which were forward step-fault types.There are mainly three periods of fault activity.Such as Eocene-Early Oligocene，early-mid of Late Oligocene，and Early Miocene.The faults in the step-fault zone affected the development and evolution of hydrocarbon source rocks in south Baodao Sag.The faults control the spatial distribution of sandstone and the development of structural traps in Sanya Formation and Lingshui Formation.The dense faults in the zone provide channel for hydrocarbon vertical migration.Additionally，the results showed that the fault active period matched well with hydrocarbon accumulation by the data of hydrocarbon generation and expulsion history and trap formation history.Through these researches，two favorable exploration strata are put forward in this paper.

Key words: Qiongdongnan Basin, Deep-water area, Fault, Natural gas exploration

中图分类号: 

  • TE122.2

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