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Prouty (1976) proposed a wrenching model to account for the linear infrastructures of the Michigan basin. This was based first on lineament (fault) patterns and outcrop fracture analyses (“ground truth”). The azimuths of linear producing fields fit closely the shear model. To test the model, analyses (X-ray diffraction) of numerous well samples from several producing fields show a coincidence of the occurrence of epigenetically formed dolomite (porous reservoir rock) channelways along with structural features such as vertical shear faults (shear couples), shear folds, and offshoots from the fault channelways of the wrenching model. This porous dolomite is the reservoir rock of the producing fields. The shear model offers an important additional dimension in field development as well as exploration for new structures.

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