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有关原油裂解气和干酪根裂解气的区分问题,以往的研究中主要采用了Behar等和Pinzhofer等的研究成果,即C2/C3比值在干酪根的初次裂解气中基本是一个常数,C1/C2逐渐增加,而在原油裂解生气过程中C2/C3迅速增加,C1/C2保持相对稳定.模拟实验的研究表明,无论是原油还是干酪根,在其裂解生气过程中,随热力条件的增加,C2/C3,C1/C2,C1/C3均会增加;比较而言,C2/C3受天然气来源类型的影响相对较小,主要反映天然气的成熟度特征.当C2/C3约为2,C2/iC4约等于10时,对应的Ro值约为1.5%~1.6%.而C1/C2,C1/C3则明显受来源特征的影响.在C2/C3接近的条件下,原油裂解气的C1/C2,C1/C3值明显低于干酪根裂解气,且其干燥系数也相应较低.这一认识与以往的区分方法在理论上存在较大差异.实例分析表明,运用上述基本观点,可有效解决原油裂解气和干酪根裂解气的区分问题.
In the past, Behar et al. And Pinzhofer et al. Mainly used the research results on the distinction between pyrolyzed gas and kerogen pyrolysis gas. The C2 / C3 ratio is basically a constant in the kerogen primary pyrolysis gas. The C1 / C2 While C2 / C3 increased rapidly and C1 / C2 remained relatively stable during the cracking of crude oil.Research shows that both crude oil and kerogen, during the pyrolysis of crude oil, with the increase of thermal conditions, C2 / C3, C1 / C2 and C1 / C3 both increase; comparatively speaking, C2 / C3 is relatively less affected by natural gas source types and mainly reflects the maturity characteristics of natural gas.When C2 / C3 is about 2, C2 / iC4 The corresponding Ro value is about 1.5% ~ 1.6% at about 10, while C1 / C2 and C1 / C3 are obviously affected by the source characteristics. Under the condition of C2 / C3 close, the C1 / C2, The value of C1 / C3 is obviously lower than that of kerogen pyrolysis gas, and its drying coefficient is correspondingly lower. This understanding is different from the previous distinction in theory. Case studies show that using the above basic ideas can effectively solve the crude oil Problem of Pyrolysis Gas and Kerogen Pyrolysis Gas.