摘要
利用生烃动力学方法对酒西盆地青西凹陷下白垩统湖相白云质和湖相泥质烃源岩进行定量评价。通过对干酪根在封闭体系下的热解模拟实验,研究了不同岩性烃源岩干酪根热解生烃演化特征,获得了干酪根的生烃动力学参数。湖相泥岩干酪根的指前因子比湖相碳酸盐岩的小,活化能主峰也较后者低。湖相泥岩样品生成甲烷的活化能分布范围为43-67 kcal/mol,湖相碳酸盐岩样品生成甲烷的活化能分布在51-74 kcal/mol之间。在此基础上,结合Kinetics软件,将此动力学参数应用于地质实际中,结果表明,青西凹陷湖相泥岩和湖相泥质白云岩生烃作用时间晚,大量生烃出现在16 Ma之后,主生烃期发生在2 Ma左右。
By the method of kinetics,the quantitative evaluation of lacustrine argillaceous dolomite and lacustrine mudstone source rock is made.Pyrolysis simulation experiments have been carried out in a closed system,and have obtained kinetic parameters of the two different lithology source rocks.The results show that kerogen preexponential and the activation energy main peak of lacustrine mudstone is lower than that of the lacustrine argillaceous dolomite.The activation energy distribution for the lacustrine mudstone and argillaceous dolomite hydrocarbon generation of C1 are 43-67kcal/mol and 51-74kcal/mol,respectively.On this basis,combining with the Kinetics software,the kinetic parameters are applied to the geological practical.It is demonstrated that Lower Cretaceous lacustrine source rocks（mudstone and argillaceous dolomite） in Qingxi depression generate gas relatively later,which enter the ＂gas window＂ in the last 16 Ma and main gas peak was at 2 Ma.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2011年第2期219-223,共5页
Natural Gas Geoscience
基金
中国科学院"西部之光"人才培养计划项目
甘肃省中青年科技基金项目联合资助
关键词
酒西盆地
青西凹陷
湖相烃源岩
生烃动力学
Jiuxi basin
Qingxi depression
Lacustrine source rocks
Hydrocarbon generation kinetics.
