Taking the Carboniferous igneous reservoirs of Junggar Basin as an example

the authors examine the origin and characteristics of fractures in the igneous rocks by using reservoir geology

core data and conventional log data. Lithology of the igneous rocks are identified by MN cross plot. Taking the impact of fractures on porosity and permeability into consideration

we put forward methods for calculating elastic parameters of fractures. In combination with imaging log data

formation testing data and core description

we establish a composite evaluation method for fractured igneous reservoirs in this area. The study shows that the fractures feature in low Yang modulus and high Poisson ratio. The method can meet the needs of studying fractured igneous reservoirs in this area.