燕山地区中-新元古界烃源岩地球化学特征及油源对比  

Geochemical Characteristics of the Meso⁃Neoproterozoic Source Rocks and Oil⁃Source Correlations in the Yanshan Area

作　　者：孙中良 陈媛 李志明[1,2,3,4] 申宝剑 祝庆敏[1,2,3,4] 贾梦瑶 吴琰 Sun Zhongliang;Chen Yuan;Li Zhiming;Shen Baojian;Zhu Qingmin;Jia Mengyao;Wu Yan(Wuxi Research Institute of Petroleum Geology,Petroleum Exploration&Production Research Institute,SINOPEC,Wuxi 214126,China;State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,Wuxi 214126,China;State Energy Center for Shale Oil Research and Development,Wuxi 214126,China;Key Laboratory of Hydrocarbon Accumulation Mechanism,SINOPEC,Wuxi 214126,China;China University of Geosciences,Wuhan 430074,China)

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院无锡石油地质研究所,江苏无锡214126 [2]页岩油气富集机理与有效开发国家重点实验室,江苏无锡214126 [3]国家能源页岩油研发中心,江苏无锡214126 [4]中国石化油气成藏重点实验室,江苏无锡214126 [5]中国地质大学,湖北武汉430074

出　　处：《地球科学》2024年第5期1844-1864,共21页Earth Science

基　　金：中国中西部典型盆地陆相页岩油形成演化与富集机理(No.42090020)。

摘　　要：燕山地区中-新元古界的油气富集情况一直以来都是学者们关注的热点.运用总有机碳(TOC)测试、热解、气相色谱(GC)、气相色谱质谱(GC-MS)等方法,对其有机地球化学特征,特别是生物标志化合物、有机质来源和沉积环境进行了详细的讨论,对比油苗/沥青与烃源岩中生物标志化合物组成特征,识别燕山地区中-新元古界地层中的主力烃源岩.研究得出,下马岭组、洪水庄组烃源岩有机碳含量高,生烃潜力大,热演化程度适中,为好-极好的烃源岩,铁岭组烃源岩为差-中等烃源岩,高于庄组烃源岩热演化程度过高,已不能判断烃源岩类型.根据研究区的生物标志化合物特征,可以将其划分为两类,其中洪水庄组、铁岭组及下马岭组为第Ⅰ类烃源岩,以无环类异戊二烯姥鲛烷(Pr)和植烷(Ph)的相对含量极低,具有一定丰度的C_(20)规则三环萜烷(C_(20)TT)和C_(19)TT以及特殊的13α(正烷基)-三环萜烷系列化合物,富含四环萜烷(C_(24)Te T)、降新藿烷(Ts和C_(29)Ts)和重排藿烷(C_(30)Dia),缺失甾烷化合物为特征,揭示了第Ⅰ类烃源岩具有较高的热演化程度,缺氧的沉积环境以及特殊的成烃生物.高于庄组为第Ⅱ类烃源岩,以高丰度的C_(23)~C_(25)TT以及规则藿烷,普遍存在C_(27)~C_(29)规则甾烷,低丰度的C_(24)四环萜、降新藿烷和重排藿烷,未检测到补身烷和13α(正烷基)-三环萜系列化合物为特征,呈现出典型海相碳酸盐岩沉积环境下的原油特征以及指示了较为多样的生物来源.油源对比表明,第Ⅰ类油苗/沥青主要来源于洪水庄组烃源岩,而第Ⅱ类沥青砂岩的有机地球化学组成特征和高于庄组烃源岩十分相似.The enrichmentof Meso-Neoproterozoic oil and gas in Yanshan area has been the hot topic focused on by scholars.Total Organic Carbon(TOC)test,pyrolysis,gas chromatography(GC),gas chromatography-mass spectrometry(GC-MS)and other methods are applied in this paper to discuss organic geochemical characteristics of samples.Especially,the biomarker compounds,organic matter sources and sedimentary environment are discussed in detail.The geochemical and biomarker characteristics of oil seepage/asphalt and source rocks are compared to identify the major source rocks of Meso-Neoproterozoic strata in Yanshan Region.The results show that the source rocks of the Xiamaling and Hongshuizhuang formations,featured with high content of organic carbons,great hydrocarbon generation potential and moderate degree of thermal evolution,are good and supreme source rocks.The source rocks of Tieling Formation are poor-medium source rocks,and the degree of thermal evolution of Gaoyuzhuang Formation is excessively high to determine the type of source rocks.According to the characteristics of biomarkers in the researched area,the source rocks are divided into two categories.Wherein,the source rocks of Hongshuizhuang,Tieling and Xiamaling Formations are classified into Category I.The relative contents of acyclic isoprene pristane(Pr)and phytane(Ph)are very low,with certain abundance of regular C_(20) tricyclic terpane(C_(20)TT),C_(19)TT and special 13α(n-alkyl)-tricyclic terpanes,rich in tetracyclic terpane(C_(24)TeT),norneohopane(Ts and C_(29)Ts)and rearranged hopanes(C_(30)Dia),and are characterized by the absence of sterane compound.Revealing moderate degree of thermal evolution,anoxic sedimentary environment and a special hydrocarbon generating organism of Category I source rocks.Gaoyuzhuang Formation,provided with CategoryⅡsource rocks,is characterized with high abundance of C_(23)-C_(25)TT and regular hopane,common C_(27)-C_(29) regular steranes,low abundance of C_(24) tetracyclic terpane,norneohopane and rearranged hopane,and no drima

关 键 词：燕山地区 中-新元古界 烃源岩特征 生物标志化合物 油-源对比 地球化学 油气地质 

分 类 号：P618.13[天文地球—矿床学]