The Thermocompression Simulation Experiment of Source Rock Hydrocarbon Generation and Expulsion in Formation Porosity

Key words: 
• simulation experiment of hydrocarbon generation and expulsion /
• hydrocarbon generation in a limited space /
• pore fluid pressure /
• source rock /
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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 lowpressure 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 reconversion 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, highpressure liquid medium under conditions conducive to the discharge of hydrocarbons.