围绕碳酸盐岩烃源岩的评价标准特别是碳酸盐岩烃源岩生烃的有机碳下限值问题 ,选用川西南地区二、三叠系碳酸盐岩气田为研究对象 ,采用气藏地球化学与油气地质学相结合的研究方法 ,通过正演和反演的相互比较印证 ,利用先进的地球化学分析手段 ,进行了油气源对比 ,从自然剖面上研究了碳酸盐岩烃源岩有机碳分布 ,从理论上推导了碳酸盐岩生烃的有机碳下限值 ,并计算了生烃量 ,然后根据地质背景及油气勘探开发实践 ,与资源量进行了对比 ,从而确定川西南地区二叠系碳酸盐岩烃源岩生烃的有机碳下限值为 0 .3 %。同时还讨论了碳酸盐岩烃源岩在生烃机理、条件、影响因素和成烃过程等方面与泥岩烃源岩的差异以及碳酸盐岩烃源岩残余有机碳的生烃下限的影响因素等问题。

Carbonate source rock research is one of the important problem in petroleum organic geochemistry and in petroleum exploration in carbonate rocks. One of the argument is the evaluation standard of source rock, and the focus is minimum value of TOC of source rocks. Aimed at gas fields of Permian and Triassic carbonate of southwest Sichuan basin, combining gas reservoir geochemistry with petroleum geology, utilizing advanced geochemical analysis, correlating gas with source rock, observing the variation of TOC in vertical section, the article has deduced the minimum value of TOC of source rock in theory. And conversely, based on the geological condition and the background of exploration, calculated the hydrocarbon
source quantity, compared with the prospective resources, the author determined 0.3% as the minimum value of TOC of carbonate source rocks in Permian carbonate of southwest Sichuan basin. By the way, the differences of  mechanism, conditions, influence and process of hydrocarbon formation between the carbonate and clastic rocks is discussed.