Igneous lithofacies in Zao 35 Block, Dagang Oilfield

Based on lithology characteristics and distribution of igneous rocks in the Zao 35 Block of Dagang Oilfield, the lithofacies mode of igneous rocks is established. Based on themode, the igneous rocks are divided into two lithofacies (outburst and overflow facies) and four microfacies (tuff, volcanic breccia, vesicular basalt, and dense basalt microfacies). The profile and plane distribution characteristics of microfacies are described. The attempt is made on calibrating igneous lithofacies with seismic attribute. The domination of igneous microfacies on the types of reservoir space and degrees of fracture growth are also studied.