Abstract:

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.

Key words:  , Key words：elastic parameter, fracture, imaging logging, log evaluation, igneous rock, Carboniferous, Junggar Basin