西南石油大学学报(自然科学版) ›› 2020, Vol. 42 ›› Issue (2): 48-60.DOI: 10.11885/j.issn.1674-5086.2018.10.27.30

• 地质勘探 • 上一篇    下一篇

塔中地区原油含硫化合物类型与TSR成因关系

袁余洋1,2, 汪天凯3, 蔡春芳4, 许辰璐4, 秦启荣2   

  1. 1. 遵义师范学院工学院, 贵州 遵义 563006;
    2. 西南石油大学地球科学与技术学院, 四川 成都 610500;
    3. 中核工程咨询有限公司, 北京 丰台 100073;
    4. 中国科学院地质与地球物理研究所, 北京 朝阳 100029
  • 收稿日期:2018-10-27 出版日期:2020-04-10 发布日期:2020-04-10
  • 通讯作者: 蔡春芳,E-mail:cai_cf@yahoo.com
  • 作者简介:袁余洋,1982年生,男,汉族,河南周口人,讲师,博士,主要从事沉积岩石学、沉积地球化学方面的研究。E-mail:yuanyy1234@126.com;汪天凯,1988年生,男,汉族,内蒙古包头人,工程师,博士,主要从事能源战略发展方面的研究工作。E-mail:tkwang@189.cn;蔡春芳,1966生,男,汉族,福建福清人,研究员,博士生导师,主要从事沉积盆地流体岩石相互作用方面的研究工作。E-mail:cai_cf@yahoo.com;许辰璐,1988年生,男,汉族,黑龙江哈尔滨人,博士,主要从事稳定同位素应用于古海洋环境恢复和油气源对比方面的研究工作。E-mail:xcl@mail.iggcas.ac.cn;秦启荣,1964年生,男,汉族,四川广安人,教授,博士生导师,主要从事含油气盆地构造地质、特殊储层评价等方面的研究工作。E-mail:qqrong@swpu.edu.cn
  • 基金资助:
    国家自然科学青年基金项目(41602124);国家自然科学基金重点项目(41730424);国家科技重大专项(2017ZX05008-003-040);遵义师范学院博士基金项目(尊师BS[2018]07号)

Relationships Between Sulfur-containing Compound Types in Crude Oil and Causes of Thermochemical Sulphate Reduction in Tazhong Area

YUAN Yuyang1,2, WANG Tiankai3, CAI Chunfang4, XU Chenlu4, QIN Qirong2   

  1. 1. College of Engineering and Technology, Zunyi Normal University, Zunyi, Guizhou 563006, China;
    2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    3. China Nuclear Engineering Consulting Co. Ltd., Fengtai, Beijing 100073, China;
    4. Institute of Geology and Geophysics, Chinese Academy of Sciences, Chaoyang, Beijing 100029, China
  • Received:2018-10-27 Online:2020-04-10 Published:2020-04-10

摘要: 塔中奥陶系原油中检测到噻吩、四氢噻吩(Tetrahydrothiophenes,TIs)、苯并噻吩(Denzothiophenes,BTs)、二苯并噻吩(Dibenzothiophenes,DBTs)及硫代金刚烷(Thiaadamantanes,TAs)等多种含硫化合物,这些化合物的含量及其单体硫同位素值存在较大差异。分析认为,这些差异可能与热化学硫酸盐还原反应作用(Thermochemical SulfateReduction,TSR)对原油的改造有关。未经历TSR改造的原油样品,其四氢噻吩及硫代金刚烷化合物含量均较低;但是,受过TSR改造的原油样品,随着TSR程度的增高,其二苯并噻吩类化合物的含量也随增高,表明TSR过程中可能生成了二苯并噻吩类化合物。另外,通过对比未经历TSR的寒武系原油样品和经受强烈TSR改造的寒武系凝析油样品的硫同位素值及硫代金刚烷总浓度等数据,证明TSR也改变了原油硫同位素值。在TSR强烈改造的原油样品中,DBTs和硫代金刚烷单体化合物的硫同位素值在36‰~40‰;而在TSR改造较弱和未改造的奥陶系原油中,DBTs主要来自于烃源岩裂解,其硫同位素值相对较低(约20‰),与寒武系干酪根的硫同位素值接近。研究认为,塔里木盆地奥陶系原油主要来自寒武系烃源岩,而储层中一些有机硫同位素较高的原油主要为TSR改造所致。

关键词: 塔中地区, 含硫化合物, 硫同位素, 热化学硫酸盐还原反应(TSR), 硫代金刚烷

Abstract: Various sulfur-containing compounds, such as thiophene, tetrahydrothiophene, benzothiophene dibenzothiophene, and thioadamantane, were detected in crude oil extracted from the Ordovician reservoirs in the Tazhong Area. These compounds differ in their contents and isotopic values for single-atom sulfur. The analysis results show that modifications of crude oil by thermochemical sulphate reduction (TSR) may be the cause of the differences. There is less tetrahydrothiophenes and thioadamantanes in the crude oil not modified by TSR. As crude oil is increasingly modified by TSR, the total dibenzothiophene (DBT) concentration increases. This indicates that DBTs are probably formed during TSR. Meanwhile, non-TSR-modified crude oil samples were compared to highly TSR-modified condensate oil samples from Cambrian reservoirs for their sulfur isotopic values and total thioadamantane concentrations. It was found that TSR can also change the sulfur isotopic values of crude oil. The DBTs and thioadamantanes in the highly TSR-modified crude oil samples have sulfur isotopic values of from 36‰ to 40‰. In contrast, the DBTs in slightly TSR-modified and non-TSR-modified crude oil from Ordovician reservoirs are mainly from cracking of source rocks; thus, their sulfur isotopic values are relatively low (~20‰) near that of kerogen in the Cambrian reservoirs. Thus, it is believed that the crude oil extracted from the Ordovician reservoirs in the Tarim Basin is mainly from Cambrian source rocks and the crude oil with higher organic sulfur isotopic values is mostly caused by TSR modification.

Key words: Tazhong Area, sulfur-containing compound, sulfur isotope, thermochemical sulphate reduction (TSR), Thioadamantane

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