Abstract: The discovery of hydrocarbon reservoirs in volcanic rocks of Kong-3 member provides a new direction for future oil and gas exploration work in Weibei sag.By using the drilling,logging and rock analysis laboratory data,the research on volcanic rock reservoir characteristics,geochemical characteristics and electrical characteristics has been carried out.The rock characteristics analysis results indicate andesite and andesite basalt are the most developed rocks in volcanic reservoir rock of Kong-3 member,and this is the most favorable reservoir rock type.Volcanic rock in Kong-3 member is mainly of basic type and belongs to calc-alkalic- alkaline rock series.Volcanic rocks in the primitive magma originated from mantle source type,and it has experienced a certain degree of separation and crystallization,the oxidation of oxygen in the atmosphere.Compared with surrounding rock up and down,volcanic rock in Kong-3 member has the characteristics of large drilling time,high density,low induction conductivity,low natural gamma and low acoustic time,and is an important symbol of volcanic rock and sand mudstone recognition.