Abstract: There are developed fractures or fissures in the Permian volcanic reservoirs in Wu-Xia area, which control the reservoirs' distribution as important channels for hydrocarbon flowing and storage. In view of the volcanic reservoir distribution and structural feature, this paper presents the research and analysis of the fracture characteristic of the volcanic rocks and the identification of structural fracture by means of rock observation and image logging. The results show that this method can be used to precisely determine the fracture parameters, calculate fracture porosity and evaluate the volcanic reservoir.

Key words: Junggar basin, Wuerhe-Xiazijie (Wu-Xia) area, Permian, volcanic rock, fracture, porosity