济阳坳陷下古生界碳酸盐岩二次生烃及其动力学研究  

Kinetics of the Secondary Hydrocarbon Generation of Lower Palaeozoic Marine Carbonate Source Rocks in Jiyang Depression,Bohaiwan Basin

作　　者：耿新华[1,2] 耿安松[2] 

机构地区：[1]广州大学化学化工学院 [2]中国科学院广州地球化学研究所有机地球化学国家重点实验室

出　　处：《海相油气地质》2011年第1期56-62,共7页Marine Origin Petroleum Geology

基　　金：中国科学院知识创新工程重大项目(KZCX1-SW-18-03);国家973项目(G1999043307)部分成果

摘　　要：以济阳坳陷下古生界海相碳酸盐岩作为研究重点,用生烃动力学方法来研究碳酸盐岩生油气过程,对各组分的生烃动力学参数进行标定,并应用热解动力学参数确定海相碳酸盐岩的生烃定量方法。在此基础上进行二次生烃动力学特征和生烃史研究,探讨下古生界碳酸盐岩的生烃潜力。燕山期古地热场具有高地温梯度和高大地热流分布广泛的特征,是古生界二次生烃的关键动力因素。REasy0.5%～0.87%对应于海相碳酸盐岩第一次生烃,REasy 0.87%～2.30%对应于海相碳酸盐岩第二次生烃,二次生烃为济阳坳陷的主要生烃阶段。济阳坳陷下古生界海相碳酸盐岩热解生成气态烃的主生气期在（130~100）Ma之间（REasy介于0.8%～2.3%）,液态烃的主生成期在（140~110）Ma之间（REasy介于0.5%～1.5%）。A kinetic simulating experiment of hydrocarbon generation was carried out on Lower Palaeozoic marine carbonate rocks in the Jiyang Depression,Bohaiwan Basin.The kinetic parameters of hydrocarbon generation were determined and these parameters were used to extrapolate the hydrocarbon-generating quantity in the carbonate rocks.Based on it,the kinetics of the secondary hydrocarbon generation and the hydrocarbon generation history was also simulated to ascertain the potential of hydrocarbon generation from the Lower Palaeozoic carbonate source rocks.Since high geothermal gradient and high earth thermal current were widely distributed during Yenshanian movment,the palaeo-geothermal field is the key kinetic factor of secondary hydrocarbon generation in Lower Palaeozoic carbonate rocks.The determination of vitrinite reflectance by EasyRo model indicates that the values of REasy 0.5%～0.87% correspond to the first hydrocarbon generation in the carbonate rocks and the values of REasy 0.87%～2.30% do to the secondary hydrocarbon generation,which is the main stage of hydrocarbon generation of the carbonate source rocks in Jiyang Depression.Thermally-degrading gaseous hydrocarbons（C1,C2,C3 and C4-5） in Lower Palaeozoic carbonate rocks mostly generated between 130 Ma and 100Ma（corresponding to REasy 0.8% ～2.3%）and light hydrocarbons（C7～C13） and heavy hydrocarbons（C13＋） mostly generated between 140Ma and 110 Ma（corresponding to REasy 0.5%～1.5%）.

关 键 词：碳酸盐岩 二次生烃 生烃动力学 镜质组反射率 下古生界 济阳坳陷 

分 类 号：TE125.2[石油与天然气工程—油气勘探]