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The reservoir lithology of Qinshankou Formation in Yaoyingtai oilfield is tight in texture, low in porosity and permebality, complex in pore structure, and varied horizontally and vertically. Since the traditional models often lead to pessimistic interpretation, which is not coincident with test results. This paper improves the“three water model”and perform data processing and interpratation evaluation, which overcomes the difficulty of three water model's parameters massive and unable to determine through determining the model parameters in different sections and blocks by core analysis data. The sufficient application with achievement has been made in evaluations on tight and low-resitivity oil reservoirs, and the definition of oil-water interface in the studied area, improving the reliability of oil-gas reservoirs interpretation.