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C. E. Prouty, 1988. "Trenton Exploration and Wrenching Tectonics— Michigan Basin and Environs", The Trenton Group (Upper Ordovician Series) of Eastern North America: Deposition, Diagenesis, and Petroleum, Brain D. Keith
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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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The Trenton Group (Upper Ordovician Series) of Eastern North America: Deposition, Diagenesis, and Petroleum
Regional facies for the Upper Ordovician Series (global classification) of eastern North America consist of clean (pure) carbonates, mixed carbonates and terrigenous clastics, shale, terrigenous clastics coarser than shale, and terrigenous clastics prograding over carbonates. The last facies is characteristic of the Upper Ordovician. Maps and cross sections for stages of the Upper Ordovician demonstrate the influence of regional tectonic events on the sedimentation pattern of these facies.