Abstract: The reservoir at Shan member 2, Yulin gas field is typically low porosity, low permeability and tight sandstone reservoir, the types of pore spaces are dominated by intergrain pores and intercrystal pores, with a few dissolved matrix pores. Lithology is the key factor impacting pore types, pore structure, physical properties of the reservoir and gascontaining property. The relationship between porosity and permeability, the types and structure of pore spaces, reserving and productive capacity and response character of electrical property in the reservoir with same lithologic property tend to coincidence. As the change of lithologic property, the corresponding relationship among the “four characters”mentioned above changes too. On the basis of fine study of the four characters and accurate identification of lithologic property, different parameter interpretation models are set up for different lithologic properties, the comprehensive evaluation of the reservoir is finally realized. The favorable reservoir areas between wells are pointed out, which provides reference for the next ongoing exploration and exploitation.

Key words: low permeability, tight sandstone gas reservoir, well logging, comprehensive evaluation, Yulin gas field