01764nab a2200193 4500 20260520000311.0 260224s2011 xxu Quantitative shale characterization of the tidally influenced Sego Sandstone jul. 2011 31/08/2011 ; 31/08/2011 20 p. ; 1207-1226 Transcripción del resumen del autor. Vertical permeability is a critical parameter to estimate when modeling tidally influenced deltaic successions. The Campanian Sego Sandstone, in the Book Cliffs of Utah, is an outcrop analog for tidal systems with primary reservoirs being deposited as tidal bars in both confined and unconfined settings. A simple sand-shale model was used to quantify the effective vertical permeability using the shale character of the Sego Sandstone. Shale lengths, widths, thicknesses, and frequencies were measured from high-resolution light detection and ranging point clouds. Shales in confined tidal bars are approximately three times as long (mean, 16.3 m [53.5 ft]) and as wide (mean, 5.52 m [18.1 ft]). Within unconfined tidal bars, shales are roughly equidimensional (mean length, 18.6 m [61.0 ft]; mean width, 18.3 m [60.0 ft]). The different shale dimensions of confined and unconfined tidal bars result in different effective vertical permeability distributions, indicating that these two bar types behave differently under conditions of fluid flow. In analogous reservoirs, composed primarily of tidal bars, it is essential to differentiate and map confined and unconfined tidal environments. 7 AAPG Bulletin 95 ARTICULO Burton, Darrin 44040 Wood, Lesli J. 44041 185351 185351 0 0 0 0 253170 BAAB BAAB 2026-03-06 200057425 0 200057425 2026-03-06 00:10:36 2026-03-06 ARTICULO