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The AAPG/Datapages Combined Publications Database
Kansas Geological Society
Abstract
Revisiting Pennsylvanian Reservoir Architecture—Chitwood, Norge, and Northeast Verden Fields, Caddo and Grady Counties, Oklahoma
Abstract
Pennsylvanian Midcontinent reservoir sands historically have been interpreted to originate in fluvial channel to fluvially dominated deltaic settings. In recent years, reexamination of cored intervals and outcrop analogs of many of these reservoir units has modified the original depositional models to include incised valley fills and tidally influenced estuarine to tide-dominated deltaic and shallow marine shoal settings. Incorporating these modified reservoir architectures into field development strategies has led to improved secondary recovery and maximized daily production volumes and ultimate cumulation.
In particular, the original geologic models for the 30-year-old Chitwood, Norge, and Northeast Verden fields in Caddo and Grady counties, Oklahoma, have been modified substantially by reexamination of old field development cores and the recent acquisition of new cores and Formation Micro-Imaging (FMI) data sets. Stacked, fluvial channels within the Huddleston sand of Chitwood field have been recognized as early transgressive valley fill with pronounced tidal channel/shoal reworking. Similarly, initial fluvial deltaic models in the Missourian Marchand sand now reflect dramatic tidally influenced to tide-dominated shoal flow units. With no abrupt seaward shifting of facies present, a prograding highstand deltaic setting is envisioned for the Marchand sand in Norge and Northeast Verden fields.
By revisiting such fundamental geologic information, producers can better understand reservoir architecture for optimal well placement and more efficient design of secondary-recovery technologies. This is especially true where the geologic data are utilized in current, reservoir-engineering flow models.
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