Triassic naturally fractured carbonates have proved to be very prolific in British Columbia. The fractures are of tectonic origin and were probably generated during the Laramide orogeny which created a series of compressional type structures. The formation evaluation was conducted with a dual-porosity model which allowed estimates of matrix and fracture porosities from logs. Water saturation in matrix and fractures were calculated with the use of a statistical procedure without previous knowledge of water resistivity. In addition, the interpretation led to estimates of bitumen content and percentages of siltstone, limestone and dolomite. The determination of the bitumen content is very important because bitumen can reduce effective permeability to gas quite significantly.