摘要
准噶尔盆地玛湖凹陷二叠系风城组、乌尔禾组和其他不同层系原油中普遍检测出三芳甾烷(TAS)和三芳甲藻甾烷系列。基于多口井的原油和14块代表性烃源岩样品的芳烃组分色谱-质谱资料,系统分析其TAS组成特征,并将其用于油源对比研究。结果表明:TAS分布特征可以有效区分准噶尔盆地玛湖凹陷二叠系风城组烃源岩和乌尔禾组烃源岩。风城组烃源岩中TAS具有C_(26)-20S含量低、C_(27)-20R含量高的分布特征,并且几乎不含有三芳甲藻甾烷;而乌尔禾组烃源岩中TAS具有相反的分布特征,即C_(26)-20S相对丰度较高,C_(27)-20R相对丰度较低,并且具有分布完整的三芳甲藻甾烷系列。玛湖凹陷不同层系原油TAS分布特征基本一致,主要表现为C_(26)-20S含量低,C_(27)-20R含量高,三芳甲藻甾烷含量低或者未检测出,与风城组烃源岩分布特征相似。应用C_(26)-20S/C_(28)-20S TAS与C_(27)-20R/C_(28)-20R TAS比值和TAS三角图图版进行了原油对比分析,结果表明不同层系原油均来源于风城组烃源岩。因此,三芳甾烷及三芳甲藻甾烷系列可以作为该区油源对比的有效分子标志物。
Triaromatic steroids (TAS) are effective indicators for crude oil family classification and oil-source correlation.Based on analyses of gas chromatographymass spectrometry (GC-MS) for aromatic fractions of representative oil and source rock samples in the Mahu Sag,this paper systematically studies the TAS distribution characteristics.The results show that the distribution patterns of TAS have distinct differences,which can effectively distinguish Permian Fengcheng Formation(P_(1)f)and Wuerhe Formation(P_(2)w)source rocks in the study area.The relative contents of C_(26)20S TAS are lower,while those of C27-20R TAS are relatively higher in the P1f source rocks.In contrast,the P_(2)w source rocks are characterized by high relative contents of C_(26)20S TAS and low relative contents of C_(27)20R TAS.Furthermore,the distributions of triaromatic dinosteranes in P_(2)w source rocks are complete and readily identified,while the P_(1)f source rocks contain less those compounds.All oil samples from different strata are characterized by low relative contents of C_(26)20S TAS,high relative contents of C_(27)20R TAS and less triaromatic dinosteranes,which is consistent with those of the P_(1)f source rocks.Low C_(26)-20S/C_(28)-20S TAS ratios,high C_(27)-20R/C_(28)-20R TAS ratios and the triangle diagram of C_(26)-C_(28)TAS indicate that the crude oils in different strata are mainly derived from P_(1)f source rocks.Therefore,TAS and triaromatic dinosteranes can be used as effective molecular markers for oil source correlation in the study area.
作者
王东勇
李美俊
杨禄
杨远峰
李二庭
靳军
邹贤利
徐伯东
WANG Dongyong;LI Meijun;YANG Lu;YANG Yuanfeng;LI Erting;JIN Jun;ZOU Xianli;XU Bodong(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;Key Laboratory of Exploration Technologies for Oil and Gas Resources(Yangtze University)Ministry of Education,Wuhan 430100,China;Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 511458,China;Baikouquan Oil Production Plant of Xinjiang Oilfield Company,PetroChina,Karamay 834000,China;Research Institute of Experiment and Detection of Xinjiang Oilfield Company,PetroChina,Karamay 834000,China;College of Petroleum,China University of Petroleum(Beijing)at Karamay,Karamay 834000,China)
出处
《天然气地球科学》
CAS
CSCD
北大核心
2022年第11期1862-1873,共12页
Natural Gas Geoscience
基金
国家自然科学基金项目(编号:41972148)
国家自然科学基金青年项目(编号:41802179)
南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(编号:GML2019ZD0102-1-01)联合资助.
关键词
三芳甾烷
三芳甲藻甾烷
油源对比
风城组
乌尔禾组
玛湖凹陷
Triaromatic steroid(TAS)
Triaromatic dinosteranes
Oil-source rocks correlation
Fengcheng Formation
Wuerhe Formation
Mahu Sag
作者简介
王东勇(1998-),男,汉,河南濮阳人,博士研究生,主要从事有机地球化学和油气勘探研究.E-mail:dywang0907@163.com;通信作者:李美俊(1972-),男,重庆人,教授,博士,主要从事有机地球化学和油气勘探研究.E-mail:meijunli@cup.edu.cn.
