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The AAPG/Datapages Combined Publications Database

CSPG Bulletin


Bulletin of Canadian Petroleum Geology
Vol. 39 (1991), No. 2. (June), Pages 224-224

"Bedding Scales of a Complex Eolian Dune using Ground-Penetrating Radar [Abstract]"

Schenk, C.J.1, Gautier, D.L.1, Olhoeft, G.R.1


Ground-penetrating radar was used on a large, complex, eolian dune along the margin of Great Sand Dunes National Monument, Colorado, to delineate the two-dimensional length scales of internal sediment packages for input to eolian hydrocarbon reservoir models. The ground-penetrating radar illustrated internal structures in the dune to a depth of 16 Previous HitmNext Hit, in a transect approximately 280 Previous HitmNext Hit long. Radar reflectors defined a main dune set 5 to 8 Previous HitmNext Hit thick, with foresets as long as 23 Previous HitmNext Hit. Thickness of other wedge- and tabular-planar sets ranged from 0.75 to 1.5 Previous HitmNext Hit, averaging 1 Previous HitmNext Hit; set lengths ranged from 6 to 12 Previous HitmNext Hit, averaging 8.5 Previous HitmNext Hit. Trough-shaped sets ranged in thickness from 0.5 to 3 Previous HitmNext Hit, averaging 1.1 Previous HitmNext Hit, and ranged in width from 5 to 22 Previous HitmNext Hit, averaging 10 Previous HitmNext Hit. Trough structures are the result of migration of superimposed dunes, or scour fills from reversing winds. Reversing winds resulted in the formation of numerous, subtle bounding surfaces along the lee slope of the dune as it migrated, defining sets ranging in thickness from 0.5 to 2 Previous HitmNext Hit, averaging 1 Previous HitmNext Hit, and with foreset lengths ranging from 15 to 23 Previous HitmNext Hit, averaging 20 Previous HitmTop. This study demonstrates the potential of ground-penetrating radar in resolving the length scales of internal sedimentary units in modern sands. Work is in progress on delineating the three-dimensional length scales of these complex eolian dune sands.

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1 United States Geological Survey, Denver, Colorado 80225

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