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现代地质 ›› 2008, Vol. 22 ›› Issue (2): 239-246.

• 能源地质学 • 上一篇    下一篇

北部湾盆地涠西南凹陷流沙港组岩性圈闭形成条件

刘震1,谭卓1,2,蔡东升3,刘明全3,付东阳1   

  1. 1中国石油大学 油气资源与探测国家重点实验室,北京102249;2中海石油 研究中心,北京100027; 3中海石油 湛江分公司,广东 湛江524057
  • 收稿日期:2007-07-12 修回日期:2007-12-15 出版日期:2008-02-20 发布日期:2008-02-20
  • 作者简介:刘震,男,教授,博士生导师,1963年出生,石油地质学专业,从事石油地质与层序地层方面的研究与教学工作。 Email:liuzhenjr@bjpeu.edu.cn

Analysis on Forming Conditions of Lithologic Trap in Liushagang Formation, Weixinan Depression of BBW Basin

LIU Zhen1, TAN Zhuo1,2, CAI Dong-sheng3, LIU Ming-quan3, FU Dong-yang1   

  1. 1Key Laboratory for Petroleum Resource and Prospecting, China University of Petroleum, Beijing102249, China;
    2Research Center,CNOOC, Beijing100027, China;
    3Zhanjiang Branch Company,CNOOC,Zhanjiang,Guangdong524057, China
  • Received:2007-07-12 Revised:2007-12-15 Online:2008-02-20 Published:2008-02-20

摘要:

涠西南凹陷为北部湾盆地一典型的箕状断陷,古近纪经历3次构造运动,地层表现为多旋回沉积特征,发育多套生储盖组合。通过对古近系沉积地层进行层序地层格架分析,认为始新统流沙港组二段(流二段)层序、流沙港组一段(流一段)下层序和流一段上层序是岩性圈闭发育的主要层序。古近系三级层序中不同体系域类型严格控制着岩性圈闭的发育和形成,具体表现为流二段层序的岩性圈闭主要发育于低位体系域和湖侵体系域,流一段下层序的岩性圈闭主要发育于低位体系域,流一段上层序的岩性圈闭主要发育于高位体系域。凹陷的多物源充填所形成的多种沉积体系类型也是形成多种类型岩性圈闭的重要原因。发育于陡坡带的近岸水下扇岩性圈闭、扇三角洲岩性圈闭、缓坡带浊积水道岩性圈闭和洼槽带湖底扇岩性圈闭为有利的圈闭目标。

关键词: 涠西南凹陷, 岩性圈闭, 层序地层格架, 沉积体系, 地震相, 北部湾盆地

Abstract:

Weixinan Depression is a typical dustpan-like rift in BBW Basin, which has experienced three tectonic movements in Paleogene, displays polycyclic sedimentary characteristics, develops several sets of source-reservoir-cap rock associations. According to the analysis on Paleogene stratigraphic framework using sequence stratigraphy, sequences in the second section of Liushagang Formation and in lower and upper sequences of the first section of Liushagang Formation are the main sequences in which lithologic traps were developed. The development and formation of lithologic traps were strictly controlled by different system tract  types in third order sequences of Paleogene. The detailed performances are: lithologic traps mainly developed in lowstand system tract and lacustrine transgressive system tract of sequence in the second section of Liushagang Formation, in lowstand system tract of lower sequences in the first section of Liushagang Formation and in highstand system tract of upper sequences in the first section of Liushagang Formation. Abundant sedimentary system types resulted from multisource filling were important to the formation of various lithologic traps. Nearshore underwater fan lithologic trap, fan delta lithologic trap which developed in steep slope belt, turbidite channel lithologic trap in gentle slope belt and sublacustrine fan lithologic trap which developed in sag belt are favorable targets.

Key words: Weixinan Depression, lithologic trap, stratigraphic framework, sedimentary system, seismic facies, BBW Basin

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