The Thermocompression Simulation Experiment of Source Rock Hydrocarbon Generation and Expulsion in Formation Porosity
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摘要: 烃源岩的生烃反应是在其限定的孔隙空间中承受高静岩压力和流体压力下进行的，然而受实验装置和条件的限制，目前大多数的生排烃模拟实验都是在一个低压、相对较大的生烃空间下进行的，与实际地质情况差异较大。通过对同一样品分别进行有限空间和常规高压釜方式加水模拟实验对比研究发现：（1）有限空间热压模拟实验的气态产物更接近地质实际。气体组分中烃气占有更大的比重；重烃气的保存下限大于常规模拟，延迟了重烃气向甲烷的转化；烯烃含量比常规加水模拟条件下更少，基本检测不到。（2）有限空间的限制使水介质参与成烃反应的作用增强，其限定空间内较高的流体压力延迟了油向烃气的转化过程，有利于液态油的生成和保存。（3）有限空间下高压液态水介质条件有利于烃类的排出。Abstract: Hydrocarbon generation was occurred in the pore space of source rock under high hydrostatic pressure and high fluid pressure. However, due to the limited experimental device and conditions, most of the generation and expulsion simulation experiment were carried out in a lowpressure and relatively large reaction space, quite different with the actual geological conditions. Through the same source rock, the authors have simulated hydrocarbon generation in finite spaces and conventional autoclave method. It can be seen: (1) the gaseous products of the simulation in finite spaces are closer to geological reality. Gas component in possession of a greater proportion of hydrocarbon gas; heavy hydrocarbon gas lower than conventional analog preservation, delayed the reconversion of hydrocarbon gas to methane; olefin content less than the conventional simulated conditions, basically undetectable. (2) The limited space constraints in the water medium into the enhanced role of hydrocarbons, and its limited space, high fluid pressure delayed the conversion of oil to the process of hydrocarbon gas, liquid oil is conducive to the formation and preservation. (3) Limited space, highpressure liquid medium under conditions conducive to the discharge of hydrocarbons.
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