Abstract
The March-April issue of Geophysics contains one tutorial and two case histories. In “Gassmann fluid substitutions: A tutorial,” Smith et al. discuss the use of fluid substitutions in seismic attribute studies. Rutledge and Phillips (“Hydraulic stimulation of natural fractures as revealed by induced microearthquakes, Carthage Cotton Valley gas field, east Texas”) demonstrate improvement in imaging a hydraulic fracture treatment by obtaining more precise source locations of microearthquakes. In “A dc resistivity and IP borehole survey at the Casa Berardi gold mine in northwestern Quebec,” Spitzer and Chouteau describe an in-hole and crosshole survey to study the spatial extent of the economic disseminated zone of an auriferous quartz vein type ore body.
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