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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 52 (1968)

Issue: 3. (March)

First Page: 546

Last Page: 546

Title: Previous HitPermeabilityNext Hit-Porosity Patterns of Some Recent Sediments: ABSTRACT

Author(s): Wayne A. Pryor

Article Type: Meeting abstract

Abstract:

Previous HitPermeabilityNext Hit, porosity, and textural analyses were conducted on 1,016 sand samples collected from river point bars, beaches, and dune fields undergoing active sedimentation. A total of 326 samples are from point bars on the Whitewater River in southwestern Ohio and the Wabash River in western Indiana; 531 samples are from beaches on the Bolivar Peninsula in Texas, Ship Island in Mississippi, and Santa Rosa Island in Florida; and 159 samples are from dunes on Santa Rosa Island and St. Andrew's Beach in Florida.

River point-bar sand samples have Previous HitpermeabilityNext Hit values ranging from 160 md to more than 500 d and average 93 d. Porosity values range from 17 to more than 50 percent, and average 38. Previous HitPermeabilityNext Hit-porosity values for point bars are highly variable and show a systematic pattern related to positions on the bars.

Beach and dune sand samples have very similar Previous HitpermeabilityNext Hit values, which range from 3,600 md to 166 d and average 60 d. Porosity values range from 30 to more than 65 percent, and average 45. Previous HitPermeabilityNext Hit-porosity values for beaches and dunes show a low variability and a poorly developed pattern related to positions within the environments.

Previous HitPermeabilityNext Hit and porosity values in all three depositional environments have low correlations with textural parameters. In some point-bar sands, high percentages of silt and clay account for low Previous HitpermeabilityNext Hit values. However, high Previous HitpermeabilityNext Hit and porosity in river-bar, beach, and dune sands are not well correlated with large grain sizes and good sorting; instead, packing seems to be the primary controlling factor.

Comparison of Previous HitpermeabilityTop-porosity values of these Recent sediments with available values from comparable ancient sediments shows that the Recent sediment values are several orders of magnitude higher; however, Recent sediments do show the same degrees of variability and distribution patterns as those in the ancient sediments.

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Copyright 1997 American Association of Petroleum Geologists