In carbonate reservoirs, it has been commonly reported that natural fracture is the primary factor that governing hydrocarbon production. By a renewed investigation into the Niobrara low permeability carbonate at the Wattenberg field in the Denver-Julesburg basin (DJ), the authors have observed a series of petrophysical factors that can be reflected by well logs affect well performance. The conventional well logs have been used to calculated or estimated these petrophysical parameters, which include irreducible water saturation calculated by the resistivity and porosity; solution gas oil ratio computed from the neutron and density; pore structure connectivity reflected by the spontaneous potential; the proximity to faults inferred from the density correction log; and original high reservoir pressure determined from changes in resistivity and neutron of overlying shale.

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