A study of intergranular and fissure permeability in Chalk and Permian aquifers,using double-packer injection testing |
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| Authors: | Michael Price Brian Morris Anne Robertson |
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| Institution: | 1. Institute of Geological Sciences, Hydrogeology Unit, Wallingford OX10 8BB Great Britain;1. London SW7 2DE Great Britain |
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| Abstract: | Double-packer injection tests have been carried out in a borehole in the Chalk of Hampshire and a borehole in the Permian Penrith Sandstone of Cumbria, England. The tests have been supplemented by borehole logging and television inspections and by laboratory measurements on cores. A new mathematical treatment has enabled results to be calculated for injection test intervals containing fissures. In both formations, transmissivity immediately around the borehole is dominated by a few major fissures. In the Penrith Sandstone there is good agreement between intergranular hydraulic conductivity measurements and packer-test results in the portions of the borehole which do not contain major fissures. In the Chalk, the packer-test values are always higher than the intergranular measurements, suggesting that some degree of fissuring is present throughout. |
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