东海盆地某凹陷中南部平湖组烃源岩有机质碳同位素组成特征  

The Carbon Isotopic Component Characteristics of Organic Matter of Pinghu Formation Source Rocks in the Center and South Part of A Certain Depression,East China Sea Shelf Basin

作　　者：万延周 陈春峰 王大卫 田超 张伯成 陈浩 欧戈 Wan Yanzhou;Chen Chunfeng;Wang Dawei;Tian Chao;Zhang Bocheng;Chen Hao;Ou Ge(China National Offshore Oil Corporation(China) Limited Shanghai Branch, Shanghai 200335, China)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200335

出　　处：《非常规油气》2020年第2期18-25,共8页Unconventional Oil & Gas

基　　金：国家重大科技专项“近海隐蔽油气藏勘探技术”(2011ZX05023-002)资助。

摘　　要：为了研究东海盆地某凹陷中南部平湖组的勘探潜力,烃源岩的特征分析日益受到重视。采用同位素质谱技术,测定烃源岩有机质碳同位素组成δ^13C值,分析海、陆相烃源岩有机质碳同位素组成特征及其变化特点。同时结合有机质成熟度,分析烃源岩的有机质来源及其沉积环境。研究结果表明①烃源岩有机质碳同位素组成随层位变新而呈变重的趋势;碳同位素组分存在δ^13C饱和烃<δ^13C非烃<δ^13C沥青质<δ^13C芳烃和δ^13C饱和烃<δ^13C非烃<δ^13C芳烃<δ^13C沥青质以及δ^13C饱和烃<δ^13C芳烃<δ^13C沥青质<δ^13C非烃特征,呈现“逆转”现象;烃源岩有机质碳CV值变化在-5.12~7.67之间,皆有陆相、海相有机质特征。②烃源岩有机质碳同位素主要受生源母质和沉积环境影响,存在海相陆相混源的特点。以上成果认识,对同类盆地烃源岩评价具有一定指导意义。In order to study the exploration potential of Pinghu formation in the center and south part of a certain depression of East China Sea Shelf Basin,the study on characteristics of source rocks has been paid great attention.Using isotope mass spectrometry,the carbon isotope composition of organic matter of source rocks in the study area was determined.The carbon isotope composition and its variation characteristics of marine and continental source rocks were analyzed.At the same time,combined with the maturity of organic matter,the source rocks and sedimentary environment of Pinghu formation source rocks in the center and south part of a certain depression of East China Sea Shelf Basin were analyzed.The results show that the carbon isotope values of organic matter of source rocks of Pinghu formation in the study area tends to become heavier.Carbon isotope values of Pinghu formation source rocks in the study area shows that saturated hydrocarbon<Non-hydrocarbon<asphaltene<aromatic hydrocarbon and saturated hydrocarbon<Non-hydrocarbon<aromatic hydrocarbon<asphaltene and saturated hydrocarbon<aromatic hydrocarbon<asphaltene<Non-hydrocarbon.The carbon isotopes of the hydrocarbon source rocks shows reverse phenomenon.The carbon CV values of organic matter of source rocks ranges between-5.12 and 7.67.It has the characteristics of continental and marine organic matter.The results show that the carbon isotope of organic matter of source rocks in the center and south part of a certain depression of East China Sea Shelf Basin is mainly influenced by sedimentary environment and source rocks.It is mixed with marine and continental source rocks.The study of the carbon isotope of organic matter of source rocks is helpful to the evaluation of source rocks in similar basins.

关 键 词：平湖组 东海盆地 碳同位素 烃源岩 有机质 

分 类 号：P597.3[天文地球—地球化学]