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In situ transmissivity of a hydrogeologically active fault zone within the Oregon accretionary prism was tested during Ocean Drilling Program (ODP) Leg 146. This experiment used an inflatable drill-string packer to conduct pressurized slug tests and constant-rate injection tests. Pressure responses during testing indicate dilation of fractures as a result of fluid injection. Consequently, test data allow examination of the transmissivity of an open fracture network. Analysis of pressurized slug-test data yields an average transmissivity of 1.0 × I0" ms", while recovery data from the constant-rate injection tests indicate transmissivities ranging from 4.7 to 9.2 × I0" ms~. Test data indicate background borehole fluid pressure was 0.25 to 0.30 MPa greater than hydrostatic (approximately one-half lithostatic excess pressure) and indicate that fractures within the fault zone remain open at pressures approximately 0.315 to 0.325 MPa above hydrostatic.

In Situ Permeability Tests at Site 892: Characteristics of a Hydrogeologically Active Fault Zone on the Oregon Accretionary Prism