辽东湾地区古近系烃源岩生物标志物特征及其地质意义  

Biomarker characteristics and geological significance of Paleogene source rocks in Liaodong Bay

作　　者：张小琴 李威[3] 王飞龙 王宁 徐耀辉 刘岩[1,2] 程如蛟 刘华秋[1,2] ZHANG Xiaoqin;LIWei;WANG Feilong;WANG Ning;XU Yaohui;LIU Yan;CHENG Rujiao;LIU Huaqiu(College of Resources and Environment,Yangtze University/Hubei Key Laboratory of Petroleum Geochemistry and Environment,Wuhan 430100,China;Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education,Yangtze University,Wuhan 430100,China;CNOOC Research Institute Co.,Ltd.,Beijing 100028,China;Tianjin Branch,CNOOC(China)Ltd.,Tianjin 300452,China)

机构地区：[1]长江大学资源与环境学院油气地球化学与环境湖北省重点实验室,武汉430100 [2]长江大学油气资源与勘探技术教育部重点实验室,武汉430100 [3]中海油研究总院有限责任公司,北京100028 [4]中海石油(中国)有限公司天津分公司,天津300452

出　　处：《岩性油气藏》2022年第1期73-85,共13页Lithologic Reservoirs

基　　金：中海石油(中国)有限公司北京研究中心“辽中北洼深层烃源岩生烃机理及天然气资源潜力研究”(编号:CCL2020RCPS0052ESN);中海油天津分公司“渤海海域中南部优质烃源岩特征及形成机理研究”(编号:CCL2020TJT0NST1956)联合资助。

摘　　要：辽东湾地区古近系沙河街组沙三段、沙一段及东营组东三段为主要的烃源岩层,具有良好的油气勘探前景。为了揭示烃源岩的地球化学特征、沉积环境及生物来源,利用岩心和岩屑样品,通过热解、总有机碳含量测定及饱和烃色谱-质谱分析等方法,对这3套烃源岩的有机质丰度、类型、成熟度及生物标志物特征进行研究。结果表明:辽东湾地区沙一段烃源岩有机质丰度最高,沉积于较高盐度的还原湖相环境,有机质多来源于低等水生生物;沙三段烃源岩有机质丰度较高且多为混合型来源,沉积于淡水湖相沉积环境;东三段烃源岩有机质丰度最低,多来自于陆源高等植物,沉积于淡水湖相沉积环境。3套烃源岩的沉积环境和生物来源具有明显差异,通过伽马蜡烷指数,姥植比以及规则甾烷相对含量能有效识别和区分这3套烃源岩。The third member(E_(2)s^(3))and the first member(E_(2)s^(1))of Paleogene Shahejie Formation,and the third member of Dongying Formation(E_(3)d^(3))are the main source rocks in Liaodong Bay,with good oil and gas exploration prospects.In order to reveal the geochemical characteristics,sedimentary environment and biological source of source rocks,the abundance,types,maturity and biomarker characteristics of organic matter in these three sets of source rocks were studied by pyrolysis,total organic carbon content determination and saturated hydrocarbon chromatography-mass spectrometry.The results show that the source rocks of E_(2)s^(1)have the highest abundance of organic matter,which is deposited in the reduced lacustrine environment with high salinity,and the organic matter mainly comes from lower aquatic organisms.The source rocks of E_(2)s^(3)with high abundance of organic matter and more for mixed source are mainly deposited in freshwater lake facies sedimentary environment.The source rocks of E_(3)d^(3)have the lowest organic matter abundance,which mostly come from terrigenous higher plants and are deposited in freshwater lacustrine sedimentary environment.The sedimentary environment and biological origin of the three sets of source rocks are obviously different.The gammacerane index,Pr/Ph and the relative content of regular sterane can effectively identify and distinguish the three sets of source rocks.

关 键 词：烃源岩 地球化学特征 生物标志物 辽东湾地区 

分 类 号：TE122.114[石油与天然气工程—油气勘探]