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Structural Compartmentalization in a Decapitated Anticline: The Previous HitexampleNext Hit of the Divide Creek Fractured Reservoir, Piceance Basin

T. E. Hoak and A. L. Klawitter

Integrated analysis of high-resolution aeromagnetic and remote sensing Previous HitdataNext Hit, confirmed by Previous HitfieldNext Hit geology, seismic and production Previous HitdataNext Hit, demonstrates reservoir compartmentalization within the Divide Creek Previous HitFieldNext Hit, southeast Piceance Basin. Topographic constraints and Federal land use restrictions, limit the ability to collect extensive seismic Previous HitdataNext Hit across this complex structure and precludes complete characterization of subsurface structure by direct methods. Integrated analysis of airborne aeromagnetic Previous HitdataNext Hit with TM (thematic mapper) and SAR (synthetic aperture radar) Previous HitdataNext Hit, permit the resolution of the 3D complexity of this fold and its associated reservoir not easily defined using conventional 2D seismic.

The Divide Creek Anticline is a decapitated pop-up anticline. The pop-up anticline that originally formed along a deeper, Eagle Valley Evaporite detachment surface has been "decapitated" along a shallower Mancos-level detachment that translates the shallows pop-up anticlinal axis to the west. The fold is further segmented by normal faults trending axis-perpendicular to its axis that create distinct reservoir compartments. Processing of aeromagnetic Previous HitdataNext Hit using multiple bandpass filters demonstrates three detachments in the fold, and the 3D geometry of the detachments. Understanding timing of these structures is critical for constraining fracture genesis and gas migration models.

Oriented fracture Previous HitdataNext Hit from surficial studies, aeromagnetic Previous HitdataNext Hit, remote sensing imagery, and subsurface core delineate three primary trends. These trends correspond to axis- parallel, axis-perpendicular and an older oblique regional fracture sets. This fracture permeability has made Divide Creek Previous HitFieldNext Hit the most prolific Piceance Basin tight gas sand Previous HitfieldNext Hit.

Integration of aeromagnetics, remote sensing and high-resolution seismic represent a potent exploration tool for deciphering structural dynamics and fracture geometries in complex regions. Given the global abundance of such complex structures, the Previous HitexampleTop of the Divide Creek Anticline represents a classic analog for exploration models in complex, folded regions.

AAPG Search and Discover Article #91019©1996 AAPG Convention and Exhibition 19-22 May 1996, San Diego, California