烃源岩评价参数与油页岩品质指标内在关系探讨

如何用烃源岩评价参数定量评价油页岩品质级别,是目前含油气盆地油页岩评价面临的一个重要问题。通过对我国中西部鄂尔多斯、准噶尔和民和3个含油气盆地中油页岩进行系统采集,开展了含油率和发热量等油页岩品质方面的研究,同时也进行了有机质丰度、有机质类型和成熟度等烃源岩评价方面的研究,重点探讨油页岩品质参数与烃源岩丰度参数的内在关系。研究表明这3个盆地油页岩含油率(ω)、发热量与生烃潜量(S₁+S₂)相关性最好,与有机碳(TOC)的关系次之,其中含油率与生烃潜量相关系数高达0.89,两者的线性关系式为ω＝0.066（S₁+S₂）＋2.413,可以根据生烃潜量等指标对油页岩品质特征进行评价,当生烃潜量界限值为16.4mg/g、39.0mg/g、114.4mg/g,有机碳含量为3.3%、10.0%、32.3%,氯仿沥青“A”含量为0.03%、0.2%、0.85%时,油页岩的品质分别达到低级、中级、高级。

Relationship between Industrial Indexes and Source Rock Evaluation Parameters of Oil Shale

It is an important problem how to evaluate level of oil shale quality by using source rock evaluation parameters.In this paper,we collected oil shale samples distributed in Ordos basin,Junggar basin and Minhe basin and studied their industrial indexes with respect to oil yield and calorific value,as well as source rock evaluation parameters such as hydrocarbon generating potential and total organic carbon.Based on industrial indexes and source rock evaluation parameters of oil shale,we find out that oil yield and calorific value have the best correlations with hydrocarbon generating potential,respectively.The correlation coefficient between oil yield and hydrocarbon generating potential is up to 0.89,with the regression equation being ω = 0.066(S1+S2)+2.413.This result suggests that hydrocarbon generating potential is an ideal parameter to estimate oil yield,and can be used to deduce the qualities of oil shale.According to relationships between oil yield and source rock evaluation parameters,the low,middle and high level of oil shale is classified according to boundary values of 16.4,39.0 and 114.4mg/g for hydrocarbon generating potential,3.3%,10.0% and 32.3% for organic carbon and 0.03%,0.2% and 0.85% for chloroform bitumen "A",respectively.