海相烃源岩二次生烃潜力定量评价新方法

The New Method for Quantitative Evaluation Secondary Hydrocarbon Generation Potential of Marine Source Rocks

烃源岩二次生烃的演化过程是残余干酪根热解演化与残留油热裂解转化两个既相互联系又完全不同的物理化学反应过程的叠加。本文利用自制高压釜热压生烃模拟实验装置,采取分阶段连续递进模拟实验方式,以海相烃源岩样品为例分别评价了残余干酪根的生烃潜力与残留可溶有机质转化油气潜力,建立了一套不同起始与终止成熟度海相烃源岩二次生烃潜力的定量评价方法,并首次明确提出了干酪根生油指数KIo、干酪根生气指数KIg、干酪根生烃指数KIh等评价烃源岩生烃潜力的参数,弥补了ROCK-EVAL热解评价方法无法分别评价烃源岩在不同生烃演化阶段所生成的"油"或"烃气"潜力的不足。

Secondary hydrocarbon generation of source rocks included the residual kerogen pyrolysis evolution and thermal cracking of residual oil,two interrelated and completely different physical and chemical reactions.Based on simulation experiments of the natural maturity marine shale samples,used a phased continuouly progressive simulation experiment,and evaluated the residual hydrocarbon potential of kerogen and soluble organic matter into oil and gas residues potential,setd a quantitative evaluation method of secondary hydrocarbon generation of different maturity marine shale.And for the first time clearly put forward the kerogen oil source index KIo,kerogen gas index KIg,kerogen hydrocarbon index KIh and other hydrocarbon index of hydrocarbon source rock evaluation of the parameters of the potential,made up for the ROCK-EVAL pyrolysis evaluation method of source rocks can not be evaluated separately in different evolutionary stages of hydrocarbon generation of the ＂oil＂ or ＂hydrocarbon gas＂ potential deficiencies.