This paper mainly focuses on the igneous rock reservoirs of Yingcheng group in Xushen gas field, Daqing. According to plenty of data in field (Core description, conventional logging, FMI, drilling data), this work presents the general development characteristics of core fractures, the response feature of fractures in conventional well logging and FMI, then, an quantitative fracture-identification criteria has been established with the method of curve unit-principle and algorithm.

Compared with the identification results of conventional well logging, FMI shows a significant advantage of fracture characterization in most cases. In some local low-resistivity formations, conventional well logging could serve as an assist method in collating the results of FMI to distinguish the low-resistivity caused by fractures.

Results provided through practices and research in this paper demonstrates that combining FMI with the conventional well logging can lead to a creative and feasible method in identifying fractures in the igneous rock, and shed some light on related researches on other complex reservoirs, such as metamorphic rock, carbonate rock, and tight sand oil gas reservoirs.

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