Oil of Wutonggou and Pingdiquan formation came from Pingdiquan group source rock of Permain by biomarker and carbon isotope correlateion. 原油碳同位素和生物标志化合物对比表明二叠系储层的稠油来自凹陷二叠系平地泉组源岩。
Therefore the thermal evolution course experienced by the coal beds can be reflected by coalbed methane component and its carbone isotope characteristics. 反之，煤层气的组份和组份碳同位素特征也反映了煤层所经历的热演化过程。
