摘要
为系统对比湖相不同纹层型页岩生-排烃特征,开展了半封闭体系地层孔隙热压生-排烃热模拟实验及配套地球化学分析测试,系统对比研究了渤海湾盆地沧东凹陷古近系孔(孔店组)二段3类纹层状页岩生-排烃和烃类滞留过程,探讨了生-排-滞差异演化机制。研究结果表明:①纹层状页岩滞留油富集门限的镜质体反射率(Ro)介于0.4%~1.4%,不同纹层状页岩的滞留油效率存在差异,Ro介于0.8%~1.3%为页岩油滞留富集的黄金窗口。②纹层状长英质页岩总烃产率、总油产率和总气产率最高,纹层状混合质页岩和碳酸盐质页岩相对较少。纹层状碳酸盐质页岩进入滞留油富集门限的Ro=0.4%,具有“早生早排”的特点。③在不同热演化阶段3类纹层状页岩的滞留烃组分和气/油比存在差异。高演化阶段长英质页岩气/油比最高。④古湖泊环境差异控制了不同类型纹层状页岩的有机质组成和生烃活化能力,进而影响了3类纹层状页岩生-排-滞过程和滞留效率的差异性。
This study aims to systematically compare the hydrocarbon generation and expulsion characteristics of various types of lamellar lacustrine shales.Using semi-closed formation porosity thermocompression simulation experiments on hydrocarbon generation and expulsion,as well as associated geochemical analyses and tests,we conduct a systematic comparative study on the hydrocarbon generation,expulsion,and retention processes of three types of lamellar shales in the 2nd member of the Kongdian Formation(also referred to as the Kong 2 Member)in the Cangdong Sag.Accordingly,we explore the mechanisms underlying the differential evolution of hydrocarbon generation,expulsion,and retention of these lamellar shales.The results indicate that the threshold for retained oil enrichment in lamellar shales corresponds to vitrinite reflectance(R.)values of 0.4%~1.4%,with the oil retention efficiency(ORE)varying across different types of lamellar shales.In contrast,the"golden window"for retained oil enrichment corresponds to Ro values of O.8%~1.3%.Compared to the lamellar mixed shales and lamellar carbonate shales,the lamellar feldspathic shales exhibit higher total hydrocarbon yield,total oil yield,and total gas yield.The laminar carbonate shales reach the threshold for the retained oil enrichment earlier(R.=0.4%),exhibiting the characteristics of early generation and early expulsion.The three types of lamellar shales show varying retained hydrocarbon compositions and diverse gas/oil ratios(GORs)across different thermal evolution stages.Notably,the lamellar feldspathic shales show the highest GOR during the highly mature stage.The differences in the paleolake environment govern the organic matter composition and hydrocarbon-generation activation capacity of the three types of lamellar shales,further affecting the differences in their ORE and hydrocarbon generation,expulsion,and retention processes.
作者
孙彪
刘小平
赵贤正
金凤鸣
姜文亚
蒲秀刚
官全胜
刘天
时战楠
化祖献
SUN Biao;LIU Xiaoping;ZHAO Xianzheng;JIN Fengming;JIANG Wenya;PU Xiugang;GUAN Quansheng;LIU Tian;SHI Zhannan;HUA Zuxian(State Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;China Petroleum Consulting Center,Beijing 100724,China;Dagang Oilfield Company,PetroChina,Tianjin 300280,China)
出处
《石油与天然气地质》
北大核心
2026年第1期180-197,共18页
Oil & Gas Geology
基金
国家自然科学基金项目(42072150)。
关键词
差异机制
滞留油效率
生-排烃模拟
纹层状页岩
孔店组
沧东凹陷
渤海湾盆地
differential mechanism
oil retention efficiency(ORE)
hydrocarbon generation and expulsion simulation
lamellar shale
Kongdian Formation
Cangdong Sag
Bohai Bay Basin
