摘要
为了明确辽河西部凹陷南北部烃源岩条件差异、查明凹陷内不同地区原油来源,采用TOC、岩石热解、Ro、饱和烃色谱-质谱等方法对不同洼陷烃源岩及原油特征分析并进行精细油源对比.结果表明,西部凹陷沙四段烃源岩在北部发育(厚约700 m)、有机质丰度高、但成熟度较低(Ro<0.5%),有机质以陆源高等植物为主,混有少量低等水生生物,沉积于偏还原的咸水-微咸水环境;沙三段及沙一段烃源岩在凹陷南部更为发育,丰度高且成熟度高,有机质以低等水生生物为主,沉积于偏氧化的淡水环境.结果表明,北部原油来自于沙四段烃源岩;中部原油主要来自于沙三段烃源岩(冷家地区原油存在少量沙四段原油混入),而南部原油主要来自于沙三段和沙一段烃源岩.
In order to clarify the differences in source rock characteristics and investigate the source of crude oil in different areas in the Liaohe Western Depression,the TOC,rock pyrolysis,Ro,and saturated hydrocarbon gas chromatography-mass spectrometry(GC-MS) are adopted to analyze the characteristics of source rock and crude oil,and the fine oil-source correlation is carried out.Results indicate that the Es4 source rock of Liaohe Western Depression is developed in the north(about 700 m),with high organic matter abundance but low maturity(Ro0.5%).The organic matter of Es4 source rock was dominated by terrestrial higher plants,mixed with a small amount of lower aquatic organisms,and the sedimentary environment was a partially reduced saline-brackish water environment;The Es3 and Es1 source rocks of Liaohe Western Depression are developed in the south with high abundance and maturity.The organic matter was mainly derived from aquatic organisms and deposited in the oxidized freshwater environment.Results show that the crude oil in the northern part comes from the Es4 source rock.The crude oil in the central part mainly comes from the Es3 source rock(the crude oil in the Lengjia area comes from the Es4 and Es3 source rock).The crude oil in the southern part comes from the Es3 and Es1 source rock.
作者
惠沙沙
庞雄奇
柳广弟
周晓龙
胡涛
梅术星
Hui Shasha;Pang Xiongqi;Liu Guangdi;Zhou Xiaolong;Hu Tao;Mei Shuxing(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China;College of Geosciences,China University of Petroleum,Beijing 102249,China;Exploration and Development Research Institute,PetroChina Liaohe Oilfield Company,Panjin 124010,China)
出处
《地球科学》
EI
CAS
CSCD
北大核心
2023年第8期3081-3098,共18页
Earth Science
基金
国家重点基础研究发展计划(973计划)项目(2011CB201102)
中国石油科技项目(HX20180604)。
关键词
辽河西部凹陷
烃源岩评价
地化特征
油源对比
生物标志化合物
石油地质
Liaohe Western Depression
source rock evaluation
geochemical characteristics
oil-source correlation
biomarker
petroleumgeology.
作者简介
惠沙沙(1995-),女,博士研究生,主要从事油气成藏机理与资源评价研究.ORCID:0000-0002-2478-1273.E-mail:Hui_Shasha@163.com。
