油气勘探

塔里木盆地塔中地区海相原油中8,14-开环藿烷系列及其地球化学意义

  • 包建平 ,
  • 杨茜 ,
  • 朱翠山
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  • 长江大学油气资源与勘探技术重点实验室,武汉430100
包建平(1962-),男,江苏张家港人,博士,长江大学资源与环境学院教授,主要从事油气地球化学研究与教学工作。地址:湖北省武汉市蔡甸区蔡甸街大学路111号,长江大学资源与环境学院,邮政编码:430100。E-mail: 101064@yangtzeu.edu.cn

收稿日期: 2020-12-27

  网络出版日期: 2021-09-17

基金资助

国家自然科学基金(41772119,41272169)

Geochemical significances of 8,14-secohopanes in marine crude oils from the Tazhong area in the Tarim Basin, NW China

  • BAO Jianping ,
  • YANG Qian ,
  • ZHU Cuishan
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  • Key Laboratory of Oil & Gas Resource and Exploration Technology, Yangtze University, Wuhan 430100, China

Received date: 2020-12-27

  Online published: 2021-09-17

摘要

基于色谱-质谱和色谱-质谱-质谱分析,通过对比塔里木盆地塔中地区不同原油中8,14-开环藿烷系列分布与组成特征来探讨其在油源研究中的意义。结果表明,在塔里木盆地塔中地区两类海相端元油中同时检测到C35+长链藿烷系列和3个系列的8,14-开环藿烷,且呈现出不同的分布特点,表明它们可能具有特定的地球化学意义。研究区端元油中两类标志物的存在表明它们具有原生性,而与生物降解作用无关。对比发现不同类型原油中8,14-开环藿烷系列的含量存在显著差异,A类油明显低于B类油,端元油低于相应的混源油。依据8,14-开环藿烷相对含量,结合甾烷、萜烷组成特征,可以将塔中地区不同类型原油进行区分。A类油与B类油中8,14-开环藿烷相对丰度上的明显反差说明此类标志物的形成可能需要特定的地质-地球化学条件。图10表2参44

本文引用格式

包建平 , 杨茜 , 朱翠山 . 塔里木盆地塔中地区海相原油中8,14-开环藿烷系列及其地球化学意义[J]. 石油勘探与开发, 2021 , 48(5) : 928 -938 . DOI: 10.11698/PED.2021.05.05

Abstract

8,14-secohopanes in the marine oils from the Tazhong area in the Tarim Basin are detected by gas chromatography-mass spectrometry (GC-MS) and GC-MS-MS, and their distributions and compositions are compared in order to study their potential significances in oil-source correlation. C35+ long chain hopane series and three series of extended 8,14-secohopanes can be detected in two kinds of end-member oils in the Tazhong area in the Tarim Basin, and they are different in distribution, suggesting that they may have some special geochemical significances. The presence of 8,14-secohopanes in two kinds of end-member oils in the Tarim Basin suggest that these biomarkers are primary, and not related to biodegradation. The relative abundance of 8,14-secohopanes in the type-A oil is much less than that in the type-B oil, and the 8,14-secohopanes content in end-member oils is much less than that in the corresponding mixed oils. Based on the relative contents of 8,14-secohopanes and the compositions of common steranes and triterpanes, it is very effective to distinguish different crude oils from the Tazhong area. The great difference in the relative abundance of 8,14-secohopanes between the type-A oil and type-B oil suggests that their formation may require some specific geological- geochemical conditions.

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