Comparison of Oolitic Sand Bodies Generated by Tidal vs. Wind-Wave Agitation
Published:January 01, 1993
Harold R. Wanless, Lenore P. Tedesco, 1993. "Comparison of Oolitic Sand Bodies Generated by Tidal vs. Wind-Wave Agitation", Mississippian Oolites and Modern Analogs, Brian D. Keith, Charles W. Zuppann
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The trade-wind belt of the southeastern Bahamas provides a setting for wind-wave-generated oolitic sands and sand bodies that contrast dramatically with the tidal-generated oolitic sands and sand bodies of the northern Bahamas, which are restricted to shoals near the platform margins where tidal flow is strong.
In the southeastern Bahamas (Caicos Platform), waves from brisk prevailing trade winds and from open ocean swells provide intermittent bottom agitation for ooid formation. These mechanisms are producing thick and widespread oolitic grainstones of two types in four settings. Regular concentric ooids are forming on (a) wind-wave-agitated shallow subtidal and shoreface settings on the platform interior and (b) ocean-wave-agitated shorefaces facing the platform margin. These are forming stratified, prograding strand plains and are undergoing early meteoric and brine diagenesis. Irregular ooids are forming (c) broad banks and (d) widespread subtidal sheets in areas of intermittent wind-wave agitation across the platform interior.
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Mississippian Oolites and Modern Analogs
A coincidence of tectonic, eustatic, and geochemical conditions resulted in substantial deposits of oolitic limestone during later Mississippian time in the continental United States. These oolitic limestones have formed petroleum reservoirs with favorable primary and secondary recovery characteristics. Significant potential reserves in stratigraphic traps remain to be discovered and developed in these reservoirs.