改进的烃源岩生烃潜力模型及关键参数模板

An improved hydrocarbon generation model of source rocks and key parameter templates

岩石热解测试分析数据中最重要的参数——氢指数I H和原始氢指数I Ho是衡量烃源岩生烃潜力的重要指标。针对已有I Ho模型存在的不足,提出一种改进模型,提高了计算结果与实测值的符合率,并推导出碳恢复系数、原始有机碳含量、可转化碳含量、可转化碳百分比、转化率、降解率、产烃率、原始有机质孔隙度等参数的定量模型。通过统计国内外7个盆地1249组岩石热解和TOC数据,拟合得出Ⅰ型、Ⅱa型、Ⅱb型和Ⅲ型4种有机质类型烃源岩I Ho模型的关键参数值,并建立4种类型烃源岩生烃潜力、碳恢复系数、转化率、降解率、产烃率、原始有机质孔隙度等参数随T max变化的模板,弥补了有效烃源岩定量研究手段的不足,有望促进油气资源评价技术的发展。

The hydrogen index I H and the original hydrogen index I Ho,the most important parameters in the rock pyrolysis test,are critical indicators for measuring the hydrocarbon generation potential of source rocks.In view of the shortcomings of the existing I Ho model,an improved model was proposed to deliver a higher coincidence between the calculated results and the measured values.Moreover,the quantitative model of parameters such as carbon recovery coefficient,original organic carbon content,convertible carbon content,convertible carbon percentage,conversion ratio,degradation ratio,hydrocarbon generation ratio,and original organic porosity,was derived.Based on the rock pyrolysis and TOC data of 1249 groups of rock samples in 7 basins around the world,the key parameters of I Ho model for four types of source rocks with TypeⅠ,Ⅱa,Ⅱb andⅢorganic matters were obtained by fitting,and the template that the parameters(e.g.hydrocarbon generation potential,carbon recovery coefficient,conversion ratio,degradation ratio,hydrocarbon generation ratio,and original organic porosity)change with T max was established for four types of source rocks.These models and templates supplement the existing quantitative research tools for effective source rocks,and are expected to promote the development of oil and gas resources evaluation technology.