PRELIMINARY STUDY OF FORMATION POROSITY THERMOCOMPRESSION SIMULATION EXPERIMENT OF HYDROCARBON GENERATION AND EXPULSION
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摘要: 热压生排烃模拟实验是研究烃源岩热演化机理的重要手段之一。现有模拟实验技术主要强调的是温度、压力和时间,忽视了地层流体压力、生烃空间、高温高压地层水及初次排烃等重要影响因素。利用自行研制的地层孔隙热压模拟实验仪,同时考虑影响烃源岩生排烃过程的多种因素,建立地层孔隙热压生排烃模拟实验技术,对比研究发现:流体压力、生烃空间和高温高压液态水跟温度、时间一样自始至终影响着沉积有机质的生烃演化,只是在不同演化阶段其影响程度和表现形式不同。在低成熟—成熟阶段,地层孔隙—高温高压液态水热体系对Ⅰ型干酪根黑色泥岩成烃过程的影响主要表现为延缓了油的生成,抑制了气体的生成,改变了干酪根的组成特征,提高了烃源岩的生油潜力。Abstract: Thermocompression simulation experiment of hydrocarbon generation and expulsion is one of the main instruments for the study of hydrocarbon thermal evolution mechanism.The existing simulation methods consider more about temperature,pressure and time rather than pore fluid pressure,hydrocarbon generation room,high temperature and pressure liquid water as well as the first hydrocarbon expulsion.With self-developed formation porosity thermocompression simulation experiment instrument,taking into consideration of various factors,the author has set up a formation porosity thermocompression simulation experiment of hydrocarbon generation and expulsion.It has been found out,as the same as temperature and time,pressure,hydrocarbon generation room as well as high temperature and pressure liquid water affect the evolution of hydrocarbon generation from sedimentary organic ma-tters through the whole process,only different in forms and manifestations during different stages of evolution.From low-mature to mature stage,the main impact of formation porosity high temperature and pressure liquid water system on hydrocarbon generation from type Ⅰ kerogen black mud are de-laying oil generation,inhibiting gas generation,changing kerogen composition characteristics and en-hancing the hydrocarbon generation potential of source rocks.
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