f The Distinction between Ancient Fluvial and Valley-Fill Sandstone Reservoirs: Semantics or Economics

1007 THE DISTINCTION BETWEEN ANCIENT FLUVIAL AND VALLEY-FILL SANDSTONE RESERVOIRS - SEMANTICS OR ECONOMICS 1 Because fluvial sandstones form significant reservoirs a mature set of geologic models exists that relates facies sediment bodies and geomorphology to reservoir heterogeneity. Most subsurface channelform sandbodies were interpreted as channels when fluvial models were first developed (60s and 70s). Sequence stratigraphy (80s and 90s) reinterpreted many of these as incised valley-fills. Today valley fills represent the favored interpretation for subsurface channelforms. Has the pendulum swung too far? A matter of semantics or are their economic implications to these terms? The Ferron Sandstone was deposited