摘要
建立了有机质成烃恒温热压模拟实验的总包一级反应、连串一级反应和平行一级反应化学动力学模型 ,标定出烃源岩的化学动力学参数 :干酪根成气的表观活化能为 4 8.8～ 114.3kJ/mol,视频率因子为 1.91×10 2 ～ 4 .99× 10 2 s- 1(总包一级反应 ) ,油成气的表观活化能为 50 .9～ 12 0 .7kJ/mol(连串一级反应 ) ,这些动力学参数远低于以恒速升温实验为基础建立的模型所标定的动力学参数。对此的解释是 ,一级反应模型的视频率因子和表观活化能是随反应进行的程度而改变的 ;有机质成烃过程往往不是一级反应 ;目前以恒速升温实验为基础进行的有机质成烃一级反应模型存在某些理论缺陷 ,应用于生烃史的研究和生烃量的计算时需要慎重。
Different geochemical kinetic models of first order reaction were used to describe the cl osed system petroleum generation simulation under constant temperature from 30 0-600℃. The calculated activation energies and apparent frequency factors for the reactions of kerogen to gas are 48.8-114.3kJ/mol and 1.91×10 2-4.99×10 2s -1 respectively, the calculated apparent activation energies for the r eactions of oil to gas are 50.9 - 120.7 kJ/mol, much less than the result based on the Rock Eval pyrolysis. The reasons causing this severe difference in clude: (1)the apparent frequency factors and activation energies have no physica l meaning, they vary with the reaction degree; (2)hydrocarbon generation reactio n is not generally of first order. There are obvious theoretical problems in kin etic models for petroleum generation, applying these models in hydrocarbon evalu ation should be paid enough attention.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2000年第5期22-26,共5页
Petroleum Exploration and Development
关键词
烃源岩
有机质
成烃动力学
热压模拟实验
Ch emical kinetics, Hydrocarbon source rock, Oil and gas origin, Kerogen evolution, Arrhenius equation, Thermal simulation, Activation energy
