石油学报 ›› 2013, Vol. 34 ›› Issue (增刊二): 66-73.DOI: 10.7623/syxb2013S2008

• 地质勘探 • 上一篇    下一篇

北部湾盆地乌石凹陷流沙港组油页岩发育的主控因素

徐新德, 张迎朝, 黄义文, 熊小峰, 李旭红   

  1. 中海石油(中国)有限公司湛江分公司研究院 广东湛江 524057
  • 收稿日期:2013-07-26 修回日期:2013-10-22 出版日期:2013-12-25 发布日期:2014-01-15
  • 通讯作者: 徐新德,男,1970年7月生,1994年毕业于大庆石油学院,1997年获石油大学(北京)硕士学位,现为中海石油(中国)有限公司湛江分公司研究院高级工程师,主要从事油气地球化学与成藏研究。Email:xuxd@cnooc.com.cn
  • 作者简介:徐新德,男,1970年7月生,1994年毕业于大庆石油学院,1997年获石油大学(北京)硕士学位,现为中海石油(中国)有限公司湛江分公司研究院高级工程师,主要从事油气地球化学与成藏研究。Email:xuxd@cnooc.com.cn
  • 基金资助:

    国家重大科技专项“近海富生烃凹陷资源潜力再评价和新区、新领域勘探方向”(2011ZX05023-001-007)资助。

Major controlling factors for development of oil shale in Liushagang Formation of Wushi sag, Beibuwan Basin

XU Xinde, ZHANG Yingzhao, HUANG Yiwen, XIONG Xiaofeng, LI Xuhong   

  1. Research Institute of Zhangjiang Branch, CNOOC China Limited, Zhanjiang 524057, China
  • Received:2013-07-26 Revised:2013-10-22 Online:2013-12-25 Published:2014-01-15

摘要:

北部湾盆地乌石凹陷流沙港组油页岩具有良好的生油潜力,但由于其发育条件和空间分布不清,造成生烃潜力评价存在困难。为此,在油页岩地化特征评价的基础上,对乌石凹陷和涠西南凹陷流沙港组油页岩发育的古湖泊学特征及主控因素开展了对比分析。研究结果认为,在流沙港组油页岩沉积时期,湖泊藻类爆发性繁盛,为油页岩的形成提供了充足的物质条件;而较强的水体还原环境为有机质提供了良好的保存条件;不同的古湖泊演化历史,导致了乌石凹陷和涠西南凹陷流沙港组油页岩发育特征和空间分布存在差异。乌石凹陷内部较为复杂的构造沉降和沉积古地貌、分割性沉积水体,是流沙港组油页岩发育与分布规律性不强的根本原因。

关键词: 油页岩, 富有机质, 流沙港组, 乌石凹陷, 涠西南凹陷, 北部湾盆地

Abstract:

Oil shale in the Liushagang Formation of Wushi sag has great potential for oil generation. However, it remains difficult to evaluate the oil shale's potential for hydrocarbon generation due to a lack of knowledge regarding its developmental condition and spatial distribution. Based on geochemical characteristic analysis, a comparative study is carried out on the paleolimnological characteristics and major controlling factors for the development of oil shale in Liushagang Formation between Wushi sag and Weixinan sag. Results show that in the depositional period of oil shale of the Liushagang Formation, planktonic algae thrived explosively and provided adequate material condition for oil shale formation, whereas the strong reducing environment was favorable for conserving organic matter. Different paleolimnological evolution resulted in various characteristics of oil shale development and distribution in the Liushagang Formation of Wushi sag and Weixinan sag. Then it is concluded that complex tectonic subsidence, depositional paleotopography and disjunctive water body in Wushi sag were fundamental causes for the complex characteristics of oil shale development and distribution in the Liushagang Formation.

Key words: oil shale, organic-rich, Liushagang Formation, Wushi sag, Weixinan sag, Beibuwan Basin

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