冀中凹陷文安斜坡古近系原油地球化学特征及成因分析  

Geochemistry characteristics and genetic analysis of Paleogene crude oil in Wen’an Slope,Jizhong Depression

作　　者：胡琼[1,2] 林强 付建[2] 孙永河 HU Qiong;LIN Qiang;FU Jian;SUN Yonghe(No.1 Gas Production Plant of Jianghan Oilfield Branch of Sinopec,Wanzhou 404100,China;School of Geosciences,Northeast Petroleum University,Daqing 163318,China)

机构地区：[1]中国石化江汉油田采气一厂,重庆万州404100 [2]东北石油大学地球科学学院,黑龙江大庆163318

出　　处：《成都理工大学学报（自然科学版）》2023年第4期418-430,472,共14页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：黑龙江省优秀青年人才项目(140119002);黑龙江省自然科学基金项目(TD2019D001);中国石油科技创新基金项目(2020D-5007-0108)。

摘　　要：文安斜坡作为冀中凹陷重要的油气探区,其油气来源问题一直是勘探关注的重点。本次研究综合有机碳、岩石热解参数、生物标志化合物等多项指标,系统分析了研究区烃源岩和原油的地球化学特征,并结合油-油对比和油-源对比分析技术,分析了文安斜坡古近系原油的成因类型,并明确了原油来源。研究表明,文安斜坡古近系原油可分为A、B、C三类,其中:A类原油来源于霸县凹陷Es4段烃源岩的低熟油,主要分布在斜坡北部苏桥南地区;B类原油为分布在斜坡中部史各庄构造带的低熟-成熟油,由霸县凹陷Es3、Es4段烃源岩混合贡献,可能混有霸县凹陷Es^(下)_(1)烃源岩贡献;C类原油主要分布在斜坡南部议论堡地区,由马西洼槽Es^(下)_(1)段和文安斜坡Es3段烃源岩混合贡献,原油成熟度较低,为未熟油。In this paper,organic carbon,rock pyrolysis parameters,biomarkers and other indicators in an important oil and gas exploration area in Wen’an Slope of Jizhong Sag are comprehensively studied.The geochemical characteristics of source rocks and crude oil in the study area are systematically analyzed,and the genetic types and hydrocarbon sources of the Paleogene crude oil in Wen’an Slope are revealed by combining oil-oil correlation and oil-source correlation analysis techniques.The results show that the Paleogene crude oil of the Wen’an Slope can be divided into three categories.Class A crude oil is believed to come from the low-mature source rock of Es4 member of Baxian Depression,mainly distributed in the south Suqiao area in the north of the Wen’an Slope.Class B crude oil belongs to low-mature and mature oil distributed in Shigezhuang structural belt in the middle of the slope,which is contributed by the mixed source rocks of Es3 and Es4 member of Baxian depression,possibly mixed with the lower Es1 source rocks of Baxian Depression.Class C crude oil is mainly distributed in the south of the slope in the Jiaopu area,which is contributed by the mixed source rocks of the lower Es1 member of Maxi Trough and the Es3 member of Wen’an Slope.

关 键 词：文安斜坡 生物标志化合物 油源对比 生物降解 

分 类 号：P618.13[天文地球—矿床学]