含油气盆地激光原位方解石U-Pb年龄对油气成藏年代的约束——以渤海湾盆地东营凹陷为例

doi:10.7623/syxb202003003

石油学报 ›› 2020, Vol. 41 ›› Issue (3): 284-291.DOI: 10.7623/syxb202003003

含油气盆地激光原位方解石U-Pb年龄对油气成藏年代的约束——以渤海湾盆地东营凹陷为例

郭小文¹, 陈家旭¹, 袁圣强², 何生¹, 赵建新^1,3

1. 中国地质大学(武汉)构造与油气资源教育部重点实验室湖北武汉 430074;
2. 中国石油勘探开发研究院北京 100083;
3. 昆士兰大学地球与环境科学学院放射性同位素实验室澳大利亚布里斯班 QLD4072

收稿日期:2019-11-18 修回日期:2020-01-15 出版日期:2020-03-25 发布日期:2020-04-03
通讯作者: 郭小文,男,1980年7月生,2004年获中国地质大学(武汉)学士学位,2010年获中国地质大学(武汉)博士学位,现为中国地质大学(武汉)教授,主要从事油气成藏机理研究。Email:guoxw@cug.edu.cn
作者简介:郭小文,男,1980年7月生,2004年获中国地质大学(武汉)学士学位,2010年获中国地质大学(武汉)博士学位,现为中国地质大学(武汉)教授,主要从事油气成藏机理研究。Email:guoxw@cug.edu.cn
基金资助:
国家科技重大专项（2016ZX05006-003-001）和国家自然科学基金项目（No.41872139）资助。

Constraint of in-situ calcite U-Pb dating by laser ablation on geochronology of hydrocarbon accumulation in petroliferous basins: a case study of Dongying sag in the Bohai Bay Basin

Guo Xiaowen¹, Chen Jiaxu¹, Yuan Shengqiang², He Sheng¹, Zhao Jianxin^1,3

1. Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Hubei Wuhan 430074, China;
2. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
3. Radiogenic Isotope Facility, School of Earth and Environmental Sciences, The University of Queensland, Brisbane QLD4072, Australia

Received:2019-11-18 Revised:2020-01-15 Online:2020-03-25 Published:2020-04-03

摘要/Abstract

摘要：

油气成藏年代学研究是揭示油气成藏过程的关键。以渤海湾盆地东营凹陷为例，通过厘定方解石脉的发育期次，采用激光原位U-Pb同位素定年技术测定含原生烃类包裹体的方解石脉的绝对年龄，结合砂岩储层样品的流体包裹体分析，最终可综合确定油气成藏年代。流体包裹体岩相学、荧光特征和显微测温结果指示东营凹陷沙河街组存在2期油充注，但由于东营组沉积末期地层抬升剥蚀造成温度下降，采用流体包裹体方法解释的第1期油充注时间存在多解性。通过激光原位方解石U-Pb定年技术可消除第1期油充注时间的多解性，厘定第1期油充注时间在距今24~20 Ma东营组抬升剥蚀期，第2期油充注时间在距今4~3 Ma。激光原位方解石U-Pb定年技术结合流体包裹体分析可很好地用于约束油气成藏时间，提升油气成藏定年的精度，为含油气盆地特别是多旋回叠合盆地的油气成藏年代学提供更为可靠的研究方法。

关键词: 激光原位方解石U-Pb定年, 流体包裹体, 均一温度, 油气成藏年代学, 东营凹陷

Abstract:

The geochronological study of hydrocarbon accumulation is the key to reveal the hydrocarbon accumulation process. Taking Dongying sag of the Bohai Bay Basin as an example, this study determines the absolute age of calcite veins containing primary hydrocarbon inclusions through in-situ U-Pb dating by laser ablation. Combined with analyses of the fluid inclusions in sandstone samples, the time of hydrocarbon accumulation can be finally determined. Fluid inclusion petrographies, fluorescence characteristics and microthermometry results indicate that there are 2 periods of oil charging in Shahejie Formation, Dongying sag. However, due to temperature reduction caused by the uplifting and denudation of strata at the end of Dongying Formation, the first period of oil charging interpreted by fluid inclusion method is ambiguity. This multiplicity can be eliminated based on in-situ U-Pb dating by laser ablation. The first period of oil charging occurred between 24 Ma and 20 Ma corresponding to the period of the uplifting and denudation of Dongying Formation, and the second period of oil charging occurred between 4 Ma and 3 Ma. In-situ calcite U-Pb dating by laser ablation in combination with fluid inclusion analysis can be used to well constrain the time of hydrocarbon accumulation and improve the dating accuracy, providing more reliable method for the geochronological study of hydrocarbon accumulation for petroliferous basins, especially for multi-cyclical superimposed basins.

Key words: in-situ calcite U-Pb dating by laser ablation, fluid inclusions, homogenization temperature, geochronology of hydrocarbon accumulation, Dongying sag

中图分类号:

TE122.3

郭小文, 陈家旭, 袁圣强, 何生, 赵建新. 含油气盆地激光原位方解石U-Pb年龄对油气成藏年代的约束——以渤海湾盆地东营凹陷为例[J]. 石油学报, 2020, 41(3): 284-291.

Guo Xiaowen, Chen Jiaxu, Yuan Shengqiang, He Sheng, Zhao Jianxin. Constraint of in-situ calcite U-Pb dating by laser ablation on geochronology of hydrocarbon accumulation in petroliferous basins: a case study of Dongying sag in the Bohai Bay Basin[J]. Acta Petrolei Sinica, 2020, 41(3): 284-291.

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含油气盆地激光原位方解石U-Pb年龄对油气成藏年代的约束——以渤海湾盆地东营凹陷为例

Constraint of in-situ calcite U-Pb dating by laser ablation on geochronology of hydrocarbon accumulation in petroliferous basins: a case study of Dongying sag in the Bohai Bay Basin

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