000			02715nab a2200253 4500
005			20260520000320.0
008			260224s2016 xxu ing
041			_aInglés
245	0	0	_aEffective flow properties of heterolithic, cross-bedded tidal sandstones _bPart 1. Surface-based modeling
260			_a _b _cmar. 2016
270			_a08/06/2016 ; 08/06/2016
300			_a24 p. ; 697-721
520			_aTranscripción del resumen del autor: Tidal heterolithic sandstones are commonly characterized by millimeter- to centimeter-scale intercalations of mudstone and sandstone. Consequently, their effective flow properties are poorly predicted by (1) data that do not sample a representative volume or (2) models that fail to capture the complex three-dimensional architecture of sandstone and mudstone layers. We present a modeling approach in which surfaces are used to represent all geologic heterogeneities that control the spatial distribution of reservoir rock properties (surface-based modeling). The workflow uses template surfaces to represent heterogeneities classified by geometry instead of length scale. The topology of the template surfaces is described mathematically by a small number of geometric input parameters, and models are constructed stochastically. The methodology has been applied to generate generic, three-dimensional minimodels (9 m3 [~318 ft3] volume) of cross-bedded heterolithic sandstones representing trough and tabular cross bedding with differing proportions of sandstone and mudstone, using conditioning data from two outcrop analogs from a tide-dominated deltaic deposit. The minimodels capture the cross-stratified architectures observed in outcrop and are suitable for flow simulation, allowing computation of effective permeability values for use in larger-scale models. We show that mudstone drapes in cross-bedded heterolithic sandstones significantly reduce effective permeability and also impart permeability anisotropy in the horizontal as well as vertical flow directions. The workflow can be used with subsurface data, supplemented by outcrop analog observations, to generate effective permeability values to be derived for use in larger-scale reservoir models. The methodology could be applied to the characterization and modeling of heterogeneities in other types of sandstone reservoirs.
581			_a3
773	0		_tAAPG Bulletin _g100
942			_cARTICULO
100	1		_aMassart, Benoit Y.G. _955399
100	1		_aJackson, Matthew D. _923714
100	1		_aHampson, Gary J. _950029
100	1		_aJohnson, Howard D. _933745
100	1		_aLegler, Berit _955400
100	1		_aJackson, Christopher A.L. _949704
999			_c189586 _d189586