开放体系下升温速率对烃源岩产气率的影响

THE EFFECT OF HEATING-RATE TO THE HYDROCARBON GENERATION OF SOURCEROCK IN THE OPEN SYSTEM

采用全岩开放体系程序升温热模拟实验装置，对哈2井三叠系灰黑色泥岩样品进行了不同升温速率对产气率影响的模拟实验研充，结果表明：在350～500℃期间，升温速率快时（20℃／min）测得的产气量与升温速率慢时（5℃／min）测得的产气量比较接近；在500℃以上，升温速率快时（20℃／min）测得的产气量大于升温速率慢时（5℃／min）测得的产气量。这一结果与前人所做的封闭体系下升温速率越慢产气量越高的结论正好相反，认为这主要是因为本次实验采用的是开放体系，其与封闭体系下的实验反应环境和反应过程不同，升温速率对产气率的影响可能与实验体系有一定关系。

By means of whole rock thermal simulating experiment in the open system,the authors have studled the effect of different heating-rate to the hydrocarbon generation of source rock （grey-black mudstone of Trias from well Ha 2 in Tarim basin）. The result of experiment indicate the hydrocarbon generation of high heating-rate is near to that of low.heating-rate between 350℃ -500 ℃ ,while after 500℃, the hydroearbon generation of high heating-rate is more than that of low heating-rate. In the course of heating-rate enhancing,the secondary reaction in molecules of organic matter will increase,so the hydrocarbon generation is higher than that of low heating-rate. The result of this experiment is in opposition to that of the predecessor, because the environment and course of reaction in the open system are different from that in close system. The effect of heating-rate to the hydrocarbon generation have relation to the system of experiment.