柴北缘侏罗系烃源岩生烃动力学及其应用——以赛什腾凹陷为例  

Kinetics of Hydrocarbon Generation for Jurassic Source Rocks and Application in Northern Qaidam Basin:Take Saishenteng Depression as an Example

作　　者：邢蓝田[1,2] 张晓宝[1] 张瑞[3] 徐丽[1,2] 李伟[1,2] 

机构地区：[1]中国科学院地质与地球物理研究所兰州油气资源研究中心,甘肃兰州730000 [2]中国科学院研究生院,北京100049 [3]辽宁工程技术大学,辽宁阜新123000

出　　处：《天然气地球科学》2012年第1期161-166,共6页Natural Gas Geoscience

基　　金：国家自然科学基金项目(编号:40472071)资助

摘　　要：采用黄金管—高压釜限定体系生烃动力学设备,对柴北缘侏罗系烃源岩进行生烃动力学模拟实验研究,获得烃源岩的生烃动力学参数。结果表明甲烷生成的活化能范围分布较宽,主要介于49～67kcal/mol之间,有2个高峰,分别为57kcal/mol和66kcal/mol,频率因子A为1×1012/s;C1-5生成的活化能范围分布较甲烷的窄,主要介于52～66kcal/mol之间,只有1个高峰为59kcal/mol,频率因子A为1.10×1015/s。然后结合建立在赛什腾凹陷中心和斜坡上的模拟井,运用Kinetics软件研究赛什腾凹陷烃源岩的生气史,认为凹陷中心下侏罗统烃源岩在29.8Ma(N1)进入生烃门限,对应的RO值为0.67%;而斜坡上的烃源岩在23.8Ma(N12)之后才进入生气门限,对应的RO值为0.87%。A pyrolysis experiment of gas generation of source rock sampling from Qaidam basin was carried out with a high pressure and closed gold tube reaction system. The kinetic parameters of gaseous hydrocar- bon generation were also obtained. The results show that activation energy of CH4 ranges from 49kcal/mol to 67keal/mol with two peaks of 57keal/mol and 66keal/mol in a diagram of activation energy distribution if its frequency factor of 1 X 1012/s is assumed. C1 ~ activation energy ranges from 52keal/mol to 66kcal/mol with a unique peak of 59kcal/mol in the diagram and its frequency factor of 1.10 X 101S/s. Based on gas generation history simulated by kinetics software and two artificial simulation wells at the centre of Saishenteng depression and its slope, it is suggested that the Lower Jurassic source rock in the central Saishiteng depression and its slope entered the gas generation threshold at 29.8Ma（Ro is 0.67%） and 23.8Ma （Ro is 0.87 %）, respectively.

关 键 词：生烃动力学 动力学参数 柴北缘 侏罗系 赛什腾凹陷 

分 类 号：TE122.1[石油与天然气工程—油气勘探]