Abstract:

The igneous rock reservoirs of Xushen gas field，Daqing，are taken as example to state the general characteristics of core fractures，present the response feature

of the fractures in conventional well logging and FMI and establish the quantitative identification criteria of the fractures by using curve unit principle and algorithm.At

last，the identification results of conventional well logging are correlated with the core fractures and FMI.Practice shows the in terms of fracture identification，

conventional logging and FMI can be verified and complemented each other，the igneous rock fracture can be effectively identified by integrating multiple ways.The research

is meaningful for fracture study of other types of reservoirs.

Key words: igneous rock, reservoir, fracture, FMI, curve unit method