Heterogeneities in clastic reservoirs: lessons from outcrop studies of facies architecture
Conference
·
· AAPG Bull.; (United States)
OSTI ID:5795946
Heterogeneities in clastic reservoirs are a major concern during the design of enhanced recovery projects. Quantitative information about heterogeneities is sparse, and most projects assume the existence of tabular flow units with properties described by arbitrary statistical distributions. Of particular concern are channelized deposits (fluvial, deltaic, tidal, canyon, submarine fan), which are characterized by complex three-dimensional heterogeneities of at least eight scales. Studies of Jurassic-Cretaceous fluvial deposits in the Colorado Plateau area indicate six types of heterogeneity on the scale of the core to the total field: (1) individual lithofacies units, (2) lithofacies cosets, (3) growth increments of compound bars (e.g., point bars and sand flats), (4) the complete compound bar (macroforms), (5) channels, and (6) channel belts and paleovalleys (stratigraphically mappable members or submembers). Each scale may be identified in the field by bounding surfaces enclosing individual depositional units and is characterized by a distinctive control on direction permeability. At scales 3-5, lithofacies assemblages and the nature and geometry of bounding surfaces permit the three-dimensional classification of heterogeneous beds into suites of characteristic architectural elements. Eight distinctive fluvial elements have been defined.
- Research Organization:
- Univ. of Toronto, Ontario (Canada)
- OSTI ID:
- 5795946
- Report Number(s):
- CONF-890404-
- Conference Information:
- Journal Name: AAPG Bull.; (United States) Journal Volume: 73:3
- Country of Publication:
- United States
- Language:
- English
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