Porosity-Conservative, Burial-Related Diagenesis and Reservoir Quality: Upper Jurassic Hadriya Reservoir, Berri Field, Saudi Arabia
Koepnick, Richard B.
Hadryia reservoir quality is controlled by sequence stratal geometry, by depositional facies, by wide-spread preservation of primary porosity, and importantly, by burial-related microporosity enhancement and concomitant macroporosity cementation near the field's structural crest. Burial-related diagenetic processes are largely porosity conservative but are permeability destructive. The altered reservoir volume is definable as an upward-pluming, "sail-boat-keel", 3-D-geometry with the sail-boat keel oriented parallel to the long axis of the Berri Field structure. The altered low-permeability reservoir volume cross-cuts the Hadryia Reservoir sequence architecture and depositional facies patterns indicating a post-depositional origin. The orientation of the altered volume and close association with the structural crest of the field suggests formation after the onset of structural growth in Late Cretaceous time. Tilting of the Berri Field structure has caused the structural crest of the field to migrate southward from its Late Cretaceous-Pre-Neogene position to its current post-Paleogene position. The 3-D geometry of the altered reservoir volume most closely corresponds to the paleo-structural crest of the field suggesting that the processes associated with the creation of the altered reservoir volume occurred in pre-Neogene time.
AAPG Search and Discovery Article #90163©2013AAPG 2013 Annual Convention and Exhibition, Pittsburgh, Pennsylvania, May 19-22, 2013