Tuesday, May 27, 2014

Highlights—Delta Front Bars

It is a truism that sedimentary geologists like bars; some actually study them. In this paper, Ahmed et al. describe the sandy architectural elements that build deltaic deposit in an outcrop of the Cretaceous Ferron Sandstone in Utah. The study evaluates the character of sandy mouth bars and more distal detached bars, and interprets the features in the context of jet-plume concepts. Detached sand bodies are interpreted to be deposited by descending, inertial and hyperpycnal flows, whereas the cross-bedded sands in the upper delta front are interpreted as radial bars reflecting a greater degree of frictional deceleration. Shallow terminal distributary channels lie in the uppermost delta front topset. Aside from the concepts, the characterizations of grain size variation and shale dimensions provide data potentially useful for fluid flow modeling of analog subsurface reservoirs.

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