The hydrocarbons contained in the shale pores are mainly free gas and adsorbed gas. Accurate evaluation of the reservoir free gas density/hydrogen index and adsorbed gas density/hydrogen index can reflect the reservoir properties and assist in parameter evaluation. We proposed a method for calculate free gas density/hydrogen index and adsorbed gas density/hydrogen index by measures, and choose the rock density and TOC content to evaluate the above parameters with high precision. Finally, we propose qualitative and quantitative application methods for the above parameters. Based on the parameters calculated by free gas density/hydrogen index and adsorbed gas density/hydrogen index, when the free gas porosity and saturation is high, the adsorbed gas porosity and saturation is low, adsorbed gas-free gas volume ratio is low, the reservoir has the highest quality. The results show that free gas density/hydrogen index and adsorbed gas density/hydrogen index can be accurately determined and evaluated, and the application is also very meaningful. This study bridges the advantages in predicting the physical characteristics of the free gas / adsorbed gas and gas-bearing properties in shale gas reservoirs.

页岩孔中所含的烃类主要是自由气体和吸附气体。储层自由气体密度/氢指数和吸附气体密度/氢指数的准确评估可以反映储层性质并有助于参数评估。我们提出了一种通过测量来计算自由气体密度/氢指数和吸附气体密度/氢指数的方法，并选择岩石密度和TOC含量来高精度地评估上述参数。最后，针对以上参数提出了定性和定量的应用方法。根据自由气体密度/氢指数和吸附气体密度/氢指数计算的参数，当自由气体孔隙度和饱和度高时，吸附气体孔隙度和饱和度低，吸附气体-自由气体体积比低，水库的质量最高。结果表明，可以准确地测定和评价自由气体密度/氢指数和吸附气体密度/氢指数，其应用也非常有意义。这项研究在预测页岩气储层中游离气体/吸附气体的物理特征和含气性方面具有优势。