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The Leading Edge; October 2004; v. 23; no. 10; p. 974-978; DOI: 10.1190/1.1813349
© 2004 Society of Exploration Geophysicists
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Three-dimensional imaging of a deep marine channel-levee/overbank sandstone behind outcrop with EMI and GPR

Ryan P. Stepler, Alan J. Witten and Roger M. Slatt

University of Oklahoma, Norman, U.S.

Corresponding author: awitten@ou.edu

The first 20% of the full text of this article appears below.

Deepwater channel-levee/overbank sandstones are important sources of oil and gas, but their internal stratigraphy is complex and not well understood. One means to better characterize this complex stratigraphy is through the study of outcrops, such as the Dad Sandstone member of the Lewis shale (Figure 1) in Carbon County, Wyoming, U.S. (Pyles and Slatt, 2000).


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  		Figure 1. (top) The outcrop of the Dad Sandstone member of the Lewis Shale. A series of channel-fill sandstones dip toward the lower right (west). The lowermost sandstone is the subject of this study. This sandstone trends along the outcrop face toward the lower right, but is juxtaposed against shale toward the west, at the same stratigraphic level. The GPR line on the lower left of the figure (modified from Young et al., 2003) shows the base of the channel-fill sandstone (red line) where it intersects the ground surface. Northwest of the base of the sandstone, at equivalent radar times, the lithology is shale. The lower right figure shows the EMI volume in plan view, with sandstone in yellow and shale in gray; note the bend in the sandstone at the location where the channel base intersects the ground surface.

 
Channel-levee/overbank systems are a result of multiple sediment gravity flows. The channel itself is formed from aggradation of levees over long periods of time. As sediment flows within the channel, fine particles are expelled over the channel edges, thus forming the levees. Coarser particles not deposited on the levee are transported beyond the channel to form frontal splays or lobes. Sediment may slump off the levee walls onto the channel floor during this time interval. Channels are later backfilled with sand and/or mud as transport energy diminishes, probably during an early rise in sea level. The materials that fill the channel can be configured in . . . [Full Text of this Article]




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R. A. Young, J. G. Staggs, R. M. Slatt, and R. Van Dam
Application of 1-D Convolutional Modeling to Interpretation of Ground Penetrating Radar Profiles-turbidite Channel Sandstone 1, Lewis Shale, Wyoming
Journal of Environmental & Engineering Geophysics, September 1, 2007; 12(3): 241 - 254.
[Abstract] [Full Text] [PDF]


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