对于一次连续生烃的烃源岩,无论是碳酸盐岩还是泥岩,气源岩还是油源岩,其有机碳含量的下限值均为0.5%,但该下限值不适用于多旋回残留盆地烃源岩的二次生烃评价。根据热模拟生烃实验,建立了不同成熟阶段烃源岩二次生烃有机碳丰度下限值的计算方法。应用天然气生聚散动态平衡原理探索识别气源岩的方法,在气源岩Ro值大于2.5%的地区,古油藏中的沥青和原油裂解成为气源,古油藏分布决定晚期次生气藏分布。一般情况下,水溶气藏和天然气藏的形成和破坏是同步的,水溶气要成为晚期次生气藏的有效气源,其前期的保存条件很重要。表7参18 For a continuous hydrocarbon generation source rock, whether carbonate or mudstone, gas source rock or source rock, the lower limit of organic carbon content is 0.5%, but the lower limit is not suitable for multi-cycle Secondary Hydrocarbon Generation of Residual Basins Source Rocks. Based on the thermal simulation experiments, the calculation method of the lower limit of the organic carbon abundance of secondary hydrocarbon generation in different maturity stages was established. Application of dynamic equilibrium principle of natural gas coalescence to explore gas source rock identification method, the source rock ro value greater than 2.5% of the area, the ancient reservoir of asphalt and crude oil cracked into a gas source, the distribution of the ancient reservoirs decided late secondary gas reservoirs distributed. In general, the formation and destruction of water-soluble gas reservoirs and natural gas reservoirs are synchronized, and water-soluble gas is to become an effective gas source for late-stage secondary gas reservoirs. The pre-preservation conditions are very important. Table 7 Participation 18