Facies and
Sequence
Stratigraphy of the Abo Formation in the Kingdom Field Area, Terry and
Hockley Counties, West Texas
Anthony E. D’Agostino, OMNI Labs Inc., Houston, Texas
J. Michael Party, Wagner, & Brown, Ltd., Midland, Texas
Study of conventional cores, well
logs, and seismic data in the Kingdom Field
and other parts of the Abo shelf complex trend in eastern New Mexico and west
Texas has led to new concepts about the style of deposition and techniques for
stratigraphic subdivision of the Leonardian Abo Formation. The implications of
paleogeographic restoration of the Abo shelf, combined with detailed description
and interpretation of conventional cores from nine wells in Kingdom Field has
resulted in the identification of four important depositional facies that have
significant control on reservoir character. The facies are; Supratidal/Terrestrial
(up-dip and top seal), Intertidal (reservoir grainstones), Platform Interior
(reservoir barrier), and Shelf-edge (secondary reservoir). A fifth facies, Karst
Breccia, is also defined. This study reveals that the most productive facies in
Kingdom Field (and along the trend) is the intertidal facies (peloid grainstones)
not the shelf-edge facies (boundstone reef). High-resolution stratigraphic
analysis
combining Fischer plots,
well
-
log
cross-sections, and 3D seismic data
shows that at least three third-order
sequence
boundaries, associated with
exposure of the shelf and significant karsting, are intraformational in nature.