岩性油气藏 ›› 2015, Vol. 27 ›› Issue (5): 128–134.doi: 10.3969/j.issn.1673-8926.2015.05.021

• 油气地质 • 上一篇    下一篇

白云东洼油气成藏特征及主控因素研究

徐 徽,张忠涛,李瑞彪,柳保军,颜 晖,袁 才   

  1. 中海石油(中国)有限公司深圳分公司 研究院,广州 510240
  • 出版日期:2015-09-26 发布日期:2015-09-26
  • 第一作者:徐徽( 1978- ),男,硕士,工程师,主要从事石油地质方面的研究工作。 地址:( 510240 )广东省广州市海珠区江南大道中 168 号海洋石油大厦。 E-mail : xuhui5@cnooc.com.cn 。
  • 基金资助:

    国家重大科技专项“南海北部深水区陆坡盆地沉积记录与充填机制”(编号: 2011ZX05025-003-001 )资助

Hydrocarbon accumulation characteristics and main controlling factors in eastern Baiyun Sag, Pearl River Mouth Basin

Xu Hui,Zhang Zhongtao,Li Ruibiao,Liu Baojun,Yan Hui,Yuan Cai   

  1.  Research Institute of Shenzhen Branch of CNOOC Ltd. , Guangzhou 510240 , China
  • Online:2015-09-26 Published:2015-09-26

摘要:

白云东洼油气成藏主控因素不明,基于基础地质特征的研究认为,白云东洼的油气分布复杂多样,具有“油气兼生、下生上储,晚期成藏、早油晚气,差异聚集、内气外油”的成藏特征。制约其油气成藏的主控因素包括:①富生烃凹陷是大型油气田形成的物质基础。早期(裂陷期)低角度拆离断裂的活动控制着盆地的发育及烃源岩的规模。 ②有效圈闭和优势运移通道是成藏的必要条件。 晚期继承性断裂与构造脊组合控圈控运,优势鼻状汇聚型构造脊为优势油气运移和聚集区。 ③优质储层发育程度是影响珠江组下段成藏的关键因素。受陆架坡折带短期旋回迁移和沉积微地貌控制发育的多期陆架边缘三角洲— 深水扇沉积体系的优质砂体,是重要的储集层和输导层。白云东洼地区油气成藏条件好,明确其油气成藏特征及主控因素,对该区及其相邻区域的油气勘探具有一定的指导意义。

关键词: 走滑断裂, 沉积体系, 油气成藏特征, 沙垒田凸起

Abstract:

The hydrocarbon distribution in eastern Baiyun Sag is complex and variable. The hydrocarbon reservoirs in eastern Baiyun Sag own the characteristics of both generation of oil and gas, lower part generating and upper part accumulating; hydrocarbon accumulating in later stage, oil generating in early stage and gas generating in later stage, differential accumulation, as well as oil in the inner and gas in the outer. The main controlling factors for hydrocarbon accumulation are as follows: (1) hydrocarbon-generation depressions are the material basis for the formation of large oil and gas fields, and the activity of detachment faults with low angles in the early stage(rifted period) controls the basin development and the source rock scale; (2) effective traps and favorable migration pathways are two essential conditions for hydrocarbon accumulation, combined together, the inherited fractures and tectonic ridges in the later stage can control the traps and the hydrocarbon migration, and the favorable convergent nose-shaped tectonic ridges are excellent areas for oil and gas migration and accumulation; (3) the development degree of high-quality reservoirs is a critical factor influencing the hydrocarbon accumulation in Lower Zhujiang Formation, and controlled by the migration of short-term cycles of shelf slope break and sedimentary microreliefs, the high-quality sand bodies in multi-period shelf margin delta-deep water fan system with well developed sedimentation are important reservoirs and carrier beds. There are good oil and gas accumulation conditions in eastern Baiyun Sag, so to clarify hydrocarbon accumulation characteristics and main controlling factors is of certain guiding significance for hydrocarbon exploration in this area and adjacent areas.

Key words:  strike-slip faults , depositional system , hydrocarbon accumulation characteristics , Shaleitian uplift

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