Abstract: In order to establish corresponding logging facies model, the regular correlations between geofacies of various lava flows and logging response characteristics were defined with the basis of the study of the geofacics model of lava flows and the practical logging exploration data from Weibei depression(in Shandong province).Furthermore, the correlative statistical relations of △t (acoustic time) and p (density) with primary porosity of lava were obtained,and an expression of achieving the pore contents of lava was proposed. Thus, logging data can be applied to identify and divide the litho-facies members of downhole lava reservoirs and to make qualitative interpretation of their physical properties, and to predict and evaluate favourable reservoirs.