摘要
为探究盐湖相原油中脱羟基维生素E类化合物(MTTC)的组成分布特征及其控制因素,本文以渤海湾盆地东濮凹陷西斜坡地区古近系沙河街组原油为例,对MTTC的组成分布特征及其绝对浓度与原油成熟度、母质沉积环境等因素之间的关系进行了分析。结果表明,研究区原油中MTTC绝对浓度与其母质沉积环境密切相关。不同沉积环境样品中的MTTC指纹特征近似,而绝对浓度差异极大,故建议对原油母质沉积环境刻画时最好有MTTC绝对定量数据,而不能仅仅依赖于MTTC指纹特征。此外,MTTC不仅存在于未熟、低熟样品中,在成熟样品中也有检出。当成熟度未达到高、过熟阶段,对于成熟度相似的样品,古盐度是其生成、保存的主控因素。高盐环境更有利于MTTC的生成和保存。
Concentrations and compositional/distributional characteristics of methyltrimethyltridecyl chroman(MTTC) compounds in oils from the Western Slope area of the Dongpu Depression, Bohai Bay Basin, and their controlling factors, including maturity and sedimentary environment, were investigated in this study. The results showed that concentrations of the total MTTCs in the studied oils were closely related to sedimentary environments of oil source rocks. In some cases, although the fingerprint characteristics of MTTCs in oils from different sedimentary environments were similar, concentrations of the total MTTCs varied greatly. Therefore, to characterize the sedimentary environments of crude oils, concentrations of the total MTTCs should be measured instead of fingerprint characteristics of MTTCs. In addition, this study found that MTTC compounds presented not only in immature or low-mature oils but also in mature oils. The distribution characteristics of MTTC compounds in the studied oils were affected mainly by the paleo-salinity when the maturity of oils was below the high-mature stage, indicating the higher salinity was the sedimentary environment, the more favorable was the generation and preservation of MTTCs in the sedimentary organic matter.
作者
张冬琳
肖正坤
徐田武
张云献
张成富
唐友军
李洪波
黄亚浩
王霆
ZHANG Dong-lin;XIAO Zheng-kun;XU Tian-wu;ZHANG Yun-xian;ZHANG Cheng-fu;TANG You-jun;LI Hong-bo;HUANG Ya-hao;WANG Ting(College of Resources and Environment,Yangtze University,Wuhan 430100,China;State Key Laboratory of Organic Geochemistry,Guangzhou 510640,China;Exploration and Development Research Institute,Zhongyuan Oilfield Company,SINOPEC,Puyang Henan 457001,China;College of Geophysics,China University of Petroleum(Beijing),Beijing 102249,China)
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2021年第3期644-652,共9页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家自然科学基金项目(41802152)
有机地球化学国家重点实验室开放基金项目(SKLOG202019)
长江大学地质资源与地质工程一流学科开放基金项目(2019KFJJ0818016)
“十三五”国家科技重大专项(2016ZX05006-004)。
关键词
东濮凹陷
MTTC
热成熟度
古盐度
沉积环境
Dongpu depression
MTTC
organic matter thermal maturity
palaeosalinity
sedimentary environment
