|
This project
was completed in January 2002, and a final report was submitted
to the U.S. Department of Energy. The report, "Integrated Outcrop
and Subsurface Studies of the Interwell Environment of Carbonate
Reservoirs: Clear Fork (Leonardian-Age) Reservoirs, West Texas and
New Mexico," contains the following chapters: Integrated Geological
and Petrophysical Studies of Clear Fork Reservoir Analog Outcrops:
Sierra Diablo Mountains, Texas; Cycle and Sequence Stratigraphy
of the Clear Fork Reservoir at South Wasson Field: Gaines County,
Texas; Calculation and Distribution of Petrophysical Properties
in the South Wasson Clear Fork Field; 3-D Modeling of Stratigraphically
Controlled Petrophysical Variability in the South Wasson Clear Fork
Reservoir; Fracture Analysis of Clear Fork Outcrops in Apache Canyon
and Cores from South Wasson Clear Fork Field; and Modeling Coupled
Fracture-Matrix Fluid Flow in Geomechanically Simulated Fracture
Patterns.
Outcrop stratigraphy
and petrophysics were integrated with subsurface data to construct
a reservoir model suitable for fluid flow simulation and performance
prediction. The model was built using rock-fabric flow layers constrained
by high-frequency cycles and sequence boundaries. High-frequency
cycles contain a lower mud-dominated fabric and an upper grain-dominated
fabric, which defines two rock-fabric flow layers per cycle. Mud-dominated
fabrics typically have lower porosity than grain-dominated fabrics
do and the porosity difference was used to correlate cycles throughout
the study area. New sophisticated statistical methods were used
to scaleup porosity and permeability from core and log measurements
to grid-block scale. This method preserves the stratigraphic layering
of petrophysical properties in the simulation model whereas more
traditional methods fail in this regard.
|
