Intra-Basement Intrusions in the STACK Area of Oklahoma

The revitalization of old basins by technological advances in producing unconventional reservoirs has justified the acquisition of modern, high-density 3-D seismic surveys of areas that were thought to be well understood. In Oklahoma, these surveys provide new images of the basement that was previously thought to be relatively homogeneous granite and rhyolite.

Image Caption

Figure 4: A photo showing igneous sills rising through a sedimentary section in Greenland, showing a morphology similar to the hypothesized sills seen in the basement features shown in figures 2 and 3. Note how the sills "step up" into the shallower section. Photo courtesy of John Howell (

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