Atlas of Major Low-Permeability Sandstone Gas Reservoirs in the Continental United States

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This report reviews 24 formations that, either because of the large volumes of natural gas reserves contained within them, or because of the data available for their characterization, are the most important tight gas sandstones in the United States. Assessment of these sandstone reservoirs indicates that geological controls play a critical role in gas producibility and that these reservoirs share a number of key geological attributes. Reservoir genesis, just as in conventional oil and gas fields, clearly influences gas accumulation and recovery. The major tight gas sandstone reservoirs surveyed herein were deposited in barrier/strandplain (10), deltaic (8), fluvial (2), shelf (2), slope and basin (2), and fan-delta (1) depositional systems. However, production characteristics of low-permeability gas reservoirs are in large part controlled by the diagenesis that the sediment has undergone after deposition, particularly precipitation of authigenic quartz and clays. Natural fractures are widespread features of tight gas sandstones, but because they are commonly vertical extension fractures that are easily missed by vertical core, detailed information on natural fracture attributes is rarely available. The low-permeability formations covered in this volume have produced 22.3 Tcf of gas through 1988, and this figure does not include production from the "Clinton"-Medina and Berea Sandstones in the Appalachian Basin or the Davis Sandstone in the Fort Worth Basin. Estimated ultimate recovery from existing wells in the 21 formations for which production data are available is 47.1 Tcf.


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