西湖凹陷平北地区烃源岩特征及生排烃史

Characteristics and hydrocarbon generation-expulsion histories of source rocks of Pingbei area in Xihu Depression

陆俊泽 叶加仁 黄胜兵 吴娟

Lu Junze Ye Jiaren Huang Shengbing Wu Juan

中国地质大学(武汉)资源学院, 湖北武汉 430074

Faculty of Earth Resources, China University of Geosciences, Wuhan 430074

为了综合确定平北地区的主力烃源岩,深化其油气成藏动力学过程研究,在烃源岩分布特征及有机质丰度、类型和成熟度分析的基础上,应用含油气盆地数值模拟技术,定量恢复了研究区主要烃源岩层系的生排烃历史。研究表明,平北地区主要发育始新统平湖组、渐新统花港组两套烃源岩系,其中平湖组暗色泥岩为主力烃源岩,具较高的有机质丰度、成熟度、生排烃强度与排烃效率;以平湖组为源岩的油气系统应是本区油气勘探的主要目标。

In order to deepen the research of hydrocarbon accumulation process and identify the principal source rocks of Pingbei Area in Xihu Depression, hydrocarbon generation history and expulsion history in the study area are reconstructed quantitatively by dynamic numerical modeling of the petroliferous basin based on the analysis of source rock distribution characteristics, organic matter abundance, types and maturation. Two source rock system.s are revealed in the study area: Pinghu formation and Huagang formation. Pinghu formation is the principal one, which has a high organic matter abundance and maturation, hydrocarbon generation-expulsion intensity and hydrocarbon expulsion efficiency. It is suggested that the petroleum system in Pinghu formation should be the major exploration target in the study area.

https://doi.org/10.3969/j.issn.1008-2336.2009.04.038