密闭体系与开放体系模拟实验结果的比较研究及其意义

利用广泛应用的高压釜和Rock Eval热解实验技术，对松辽盆地3个有机质样品同时进行了密闭条件下的加水恒温热解实验和开放条件下的恒速升温热解实验。利用后一实验数据所标定得到的化学动力学模型计算了与高压釜相同实验条件下的有机质产油、产气率。结果表明，在线计量的恒速升温Rock Eval实验方法由于不损失C6—C13的轻质烃组分，在计量液态油的产量方面较需要抽提、恒重的高压釜实验方法更为准确。因此为解决热模拟实验中难以计量、但对成烃评价有重要意义的C6—C13组分的计量问题提供了一条有效的途经。这可能也表明，先由实验数据建立有关的化学动力学模型，之后由它来进一步计算有机质的成烃率，不仅是可行的，而且应该更为准确。

Comparison of Simulation Results from the Closed and Open Experimental Systems and Its Significance

Four〖KG*2〗organic〖KG*2〗samples in〖KG*2〗Songliao basin〖KG*2〗are simultaneously tested〖KG*2〗in the closed system of autoclave isothermal hydrous pyrolysis experiment and open system of Rock Eval constant heating rate pyrolysis experiment, separately. Based on the latter experimental data, the chemical kinetic models are calibrated and then the generation rates of oil and gas under the same conditions as the former autoclave experiment are calculated from the models calibrated. The results show that it is more accurate to measure the liquid oil product by the on line measurement of Rock Eval than the autoclave experiment that needs extraction and a constant weight because of no light hydrocarbons (C6—C13) missing in the constant heating rate experiment, and clearly, it provides an effective way to measure the light hydrocarbons (C6—C13) that are difficult to measure in the thermal simulation experiment but significant to evaluate the amount of hydrocarbon generation. Simultaneously, this method can avoid gas leakage influencing gas generation rate accuracy in the autoclave experiment. It is possibly indicated that it is not only feasible to use the chemical kinetic〖KG*2〗model calibrated by the experiment data to calculate〖KG*2〗the hydrocarbon generation rate, but also more accurate.