--> Basin Scale Overpressured "Megacompartments": Three Dimensional Diagenetic, Hydrologic, Mechanical Predictive Modeling, by C. Qin, J. M. Maxwell, and P. Ortleva; #90986 (1994).

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Abstract: Basin Scale Overpressured "Megacompartments": Three Dimensional Diagenetic, Hydrologic, Mechanical Predictive Modeling

Changxing Qin, J. Miles Maxwell, Peter Ortleva

The presence of a basin scale overpressured megacompartment has been identified in the Anadarko basin. The basal seal follows the Woodford shale, while the top seal crosses several stratigraphic units with distinct petrologic characteristics and the lateral seal, adjacent to a fault, is in coarse clastic rocks that are highly cemented. This interesting configuration indicates complicated mechanisms and controlling factors of the formation of seals and compartments. Here we show how this domain comes to develop its three dimensional closure through the coupling of the reaction-transport and mechanical processes active during basin diagenesis. The role of thermal and tectonic history, sedimentary mineralogy and stratigraphic sequence and their configuration is assessed by geological pet ological study and numerical simulations. The structure and location of the megacompartment, its time of formation and pattern of external and internal sealing structures are predicted and compared to those of the Anadarko basin.

AAPG Search and Discovery Article #90986©1994 AAPG Annual Convention, Denver, Colorado, June 12-15, 1994