Application of fluorescence spectroscopy in geological evaluation of shale oil

doi:10.7623/syxb202206006

Acta Petrolei Sinica ›› 2022, Vol. 43 ›› Issue (6): 816-828.DOI: 10.7623/syxb202206006

• PETROLEUM EXPLORATION • Previous Articles Next Articles

Application of fluorescence spectroscopy in geological evaluation of shale oil

Tian Yu¹, Liu Keyu¹, Pu Xiugang², Zhao Jianhua¹, Chen Guohui³, Zhang Yaqi¹, Zhai Kun¹, Song Yaya¹

1. School of Geosciences, China University of Petroleum, Shandong Qingdao 266580, China;
2. PetroChina Dagang Oilfield Company, Tianjin 300280, China;
3. Faculty of Earth Resources, China University of Geosciences, Hubei Wuhan 430074, China

Received:2021-03-01 Revised:2021-08-30 Published:2022-06-28

荧光光谱技术在页岩油地质评价中的应用

田雨¹, 刘可禹¹, 蒲秀刚², 赵建华¹, 陈国辉³, 张雅琦¹, 翟坤¹, 宋雅雅¹

1. 中国石油大学(华东)地球科学与技术学院山东青岛 266580;
2. 中国石油大港油田公司天津 300280;
3. 中国地质大学(武汉)资源学院湖北武汉 430074

通讯作者: 刘可禹,男,1963年10月生,1994年获澳大利亚国立大学博士学位,现为中国石油大学(华东)地球科学与技术学院教授、博士生导师,主要从事含油气系统分析。Email:liukeyu@upc.edu.cn
作者简介:田雨,女,1997年11月生,2019年获中国石油大学(华东)学士学位,现为中国石油大学(华东)硕士研究生,主要从事页岩油地质评价研究。Email:tianyu_upc@163.com
基金资助:
国家自然科学基金项目"特提斯构造域中东部典型前陆盆地形成演化机制与油气富集效应"(No.92055204)、国家自然科学基金重点项目"陆相页岩油在基质-裂缝体系中的多尺度运移机理研究"(No.05E18010210)和国家自然科学基金创新研究群体项目"油气成藏机理"(No.41821002)资助。

Abstract

Abstract: Shale possesses strong heterogeneity because of its lamellar structure. High-precision and high-resolution technical means are required for studying shale oiliness. Synchronous fluorescence spectroscopy (SFS)and total scanning fluorescence (TSF)have good application prospects in research of shale heterogeneity, and they can focus on the layer size for micro-zone analysis. The fluorescence spectrum analysis of shale samples with different maturities from Bohai Bay Basin and Sichuan Basin shows that the fluorescence peak of soluble organic matters in shale shows a red shift first and blue shift later, as well as gradual decrease of fluorescence intensity with the thermal evolution of organic matters. The fluorescence parameter R₁ represents the ratio of the total fluorescence intensity of tricyclic and tetracyclic aromatic hydrocarbons to the intensity of bicyclic aromatic hydrocarbon and can be used as a maturity index. When shale has entered into the oil generation window, R₁ is greater than 1.5. With the increasing of the maturity, R₁ decreases gradually. For the shale entering the stage of highly mature thermal evolution and gas generation, when R₁ shows no obvious change law, the lower the fluorescence intensity, the higher the evolution degree. Further, according to the principal component analysis and regression analysis, a quantitative calculation model of shale oil content based on fluorescence parameters is established to carry out the evaluation of shale oil occurrence in different lithofacies and laminated reservoirs on the scale of laminae and cores.

Key words: total scanning fluorescence, synchronous fluorescence, maturity, shale oiliness, laminae-scale analysis

摘要： 页岩的纹层状构造特征导致其具有强非均质性,研究页岩的含油性需要高精度、高分辨率的技术手段。同步荧光光谱(SFS)法和全息扫描荧光光谱(TSF)法在页岩非均质性研究中有较好的应用前景,可聚焦到纹层尺度进行微区分析。对渤海湾盆地和四川盆地不同成熟度页岩样品开展的荧光光谱分析表明,随着有机质热演化程度加深,页岩中可溶有机质的荧光峰具有先红移后蓝移、荧光强度逐渐降低的变化特征。荧光参数R₁代表了三环芳烃与四环芳烃的总荧光强度与二环芳烃荧光强度的比值,可作为一种成熟度指标。当页岩进入生油窗后,其R₁＞1.5,并随着成熟度增大,R₁逐渐减小;对于进入高成熟的热演化生气阶段的页岩,当其R₁表现出无明显变化规律时,荧光强度越小,演化程度越高。结合主成分分析和回归分析,建立了基于荧光参数表征页岩含油量的定量计算模型,达到在纹层、岩心尺度上评价不同岩相不同纹层中页岩油赋存情况的目的。

关键词: 全息扫描荧光光谱, 同步荧光光谱, 成熟度, 页岩含油性, 纹层尺度分析

CLC Number:

TE135.1

Tian Yu, Liu Keyu, Pu Xiugang, Zhao Jianhua, Chen Guohui, Zhang Yaqi, Zhai Kun, Song Yaya. Application of fluorescence spectroscopy in geological evaluation of shale oil[J]. Acta Petrolei Sinica, 2022, 43(6): 816-828.

田雨, 刘可禹, 蒲秀刚, 赵建华, 陈国辉, 张雅琦, 翟坤, 宋雅雅. 荧光光谱技术在页岩油地质评价中的应用[J]. 石油学报, 2022, 43(6): 816-828.

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Application of fluorescence spectroscopy in geological evaluation of shale oil

荧光光谱技术在页岩油地质评价中的应用

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