Microspectrofluorimetric characterization and thermal maturity assessment of individual oil inclusion

doi:10.7623/syxb201403023

ACTA PETROLEI SINICA ›› 2014, Vol. 35 ›› Issue (3): 584-590.DOI: 10.7623/syxb201403023

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Microspectrofluorimetric characterization and thermal maturity assessment of individual oil inclusion

Chen Honghan

Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China

Received:2013-11-02 Revised:2014-02-12 Online:2014-05-25 Published:2014-04-11

单个油包裹体显微荧光特性与热成熟度评价

陈红汉

中国地质大学构造与油气资源教育部重点实验室湖北武汉 430074

通讯作者: 陈红汉，男，1962年9月生，1985年毕业于武汉地质学院，1995年获中国地质大学博士学位，现为中国地质大学（武汉）资源学院石油系系主任、教授、博士生导师，主要从事油气成藏过程研究和流体包裹体系统分析。Email：hhchen@cug.edu.cn
作者简介:陈红汉，男，1962年9月生，1985年毕业于武汉地质学院，1995年获中国地质大学博士学位，现为中国地质大学（武汉）资源学院石油系系主任、教授、博士生导师，主要从事油气成藏过程研究和流体包裹体系统分析。Email：hhchen@cug.edu.cn
基金资助:
国家重点基础研究发展计划（973）项目（2012CB214804）和国家重大科技专项（2008ZX05008-003-30）资助。

Abstract

Abstract:

The oil inclusions are micro-reservoirs trapped in crystal defects or healed cracks of diagenetic minerals, carrying considerable information of hydrocarbon migration and accumulation. Microspectrofluorimetric analysis of individual oil inclusions thus becomes one of the powerful tools for researching complex processes of hydrocarbon migration and accumulation with multi-sources and multi-stages in superimposed basins. In this study, microspectrofluorimetry and structured illumination microscopy of individual oil inclusions are applied to investigate factors influencing microspectrofluorimetric characteristics of oil inclusion assemblages (OIAs) formed in the same period. Both chemical fractionation during oil migration-accumulation and trapping fractionation during inclusion trapping cause certain fluctuations in the fluorescence emission of OIAs. However, thermal maturity remains the main controlling factor of the microspectrofluorimetric characteristics of OIAs. Therefore, it is essential for thermal maturity assessments of individual oil inclusions to consider the influences of selective polar adsorption, oil cracking within inclusion, and leakage of oil inclusion on the microspectrofluorimetric characteristics of OIAs. The best approach is using structured illumination microscopy analysis to identify the altered oil inclusions and then exclude them from the following analysis. In this way, the microspectrofluorimetric characteristics of the remaining individual oil inclusions are still suitable for thermal maturity assessment.

Key words: individual oil inclusions, microspectrofluorimetry, thermal maturity, superimposed basin, event of hydrocarbon reservoiring

摘要：

油包裹体是捕获于成岩矿物晶体缺陷或愈合裂纹中的“微观油藏”，携带着丰富的油气成藏过程信息。单个油包裹体显微荧光特性分析成为叠合盆地多源多期复杂成藏过程研究强有力的工具之一。运用单个油包裹体显微荧光分析和结构光纳米显微成像技术，讨论了同一期次油包裹体显微荧光特性的影响因素，认为原油在运聚过程中的化学分馏和捕获过程中的捕获分馏会造成同一期次油包裹体荧光特性在一定范围内波动，但热成熟度仍然是影响单个油包裹体显微荧光特性的主要因素。因此，需要考虑选择性极性吸附、包裹体油裂解和泄漏对单个油包裹体显微荧光热成熟度的影响。最佳的办法是运用结构光成像技术识别出受影响的油包裹体并加以剔除，这样单个油包裹体显微荧光特性参数还是可以应用于热成熟度评价的。

关键词: 单个油包裹体, 显微荧光光谱, 成熟度参数, 叠合盆地, 油气成藏期次

CLC Number:

TE112.3

Chen Honghan. Microspectrofluorimetric characterization and thermal maturity assessment of individual oil inclusion[J]. ACTA PETROLEI SINICA, 2014, 35(3): 584-590.

陈红汉. 单个油包裹体显微荧光特性与热成熟度评价[J]. 石油学报, 2014, 35(3): 584-590.

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Microspectrofluorimetric characterization and thermal maturity assessment of individual oil inclusion

单个油包裹体显微荧光特性与热成熟度评价

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