Lefort and Miller (1999) suggested that the northwest- to west-oriented wrench faults
created pre-existing basement weaknesses, which were reactivated during Mesozoic rifting.
Then they share findings of tests at specific locations, among them the role of wrench faults
and fractures in creating "sweet spots" in tight gas exploration and production in Rulison Field in Colorado, the fracture control of P-wave azimuthal anisotropy in a Laramide basement-cored anticline at Wyoming's Casper Arch, and natural fractures in folded sandstones of the Tensleep Formation in Wyoming.
PROBE-1, has established its ability to deliver highly detailed information about oil seeps, deposits of minerals frequently found on the ground above oil and gas deposits, and wrench faults
indicative of hydrocarbon potential.