The upper part has a 20-300 md permeability, while the lower part, with 1,000-4,000 md, produces at high water cuts. One objective in fracturing is to keep the fracture growth in the zone of interest.

A new approach for evaluating neutron magnetic resonance (NMR) logs can determine permeability in tight gas reservoirs. The bulk gas-magnetic resonance permeability (BGMRK) has the same value in ...