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The AAPG/Datapages Combined Publications Database
West Texas Geological Society
Abstract
Canyon Sand - S. W. Texas Example of a Low-Permeability Gas Reservoir
Abstract
Canyon Sands (Upper Pennsylvanian) of the Val Verde basin and eastern shelf, Texas, have provided commercial gas production for over 30 years. On the eastern shelf, Canyon sandstones represent prograding deltaic deposits and in the Val Verde basin, comprise coalescing submarine-fan deposits.
Canyon reservoirs consist of clean to shaly sandstone that is predominantly cemented with quartz overgrowth and siderite. Canyon sands are low-permeability, low-pressure reservoirs that require acidizing and hydraulic-fracture stimulation treatment to produce gas at economic rates. Regular mud acid is preferred in acidizing the Canyon pay zones, and 75%-quality nitrogen is recommended for better fracture stimulation treatment results.
Good-quality 3D seismic data with other conventional geophysical and geologic tools are recommended to aid in the discovery of new Canyon gas plays in the Val Verde basin and on the eastern shelf. These new gas plays can be profitable for intermediate and small companies.
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