The long - term overlooking of the organic matter metamorphism as one of important factors in hydrocarbon reservoir preservation condition and not taking it into consideration in the petroliferous prospect assessment system would be the major masons 用这一方法研究表明，在川黔桂地区，定碳比小于90 %的有瘦煤及轻的煤变质区，可以发现气田。
