eects of reservior depletion - john t. foster · reservoir quality: moderat 80 90 100 well b 20 20...

E�ects of reservior depletion

© Cambridge University Press (Fig. 10.21, pp. 380)Zoback, Reservoir Geomechanics

Stress rotations with depletion

Original Depleted

© Cambridge University Press (Fig. 12.6ab, pp. 391)Zoback, Reservoir Geomechanics

Rotation angle, near the fault due todepletion

with

and

Deformation in depleting reservoirs

Recall: Compaction curves

© Cambridge University Press (Fig. 12.11, pp. 399)Zoback, Reservoir Geomechanics

Recall: End-cap models

© Cambridge University Press (Fig. 4.19, pp. 119)Zoback, Reservoir Geomechanics

Deformation Analysis in Reservoir Space

(DARS) model of GOM Field X

© Cambridge University Press (Fig. 12.12, pp. 402)Zoback, Reservoir Geomechanics

Permeability change as a function ofporosity change

© Cambridge University Press (Fig. 12.13a, pp. 404)Zoback, Reservoir Geomechanics

Modi�ed Kozeny-Carman relationship

For change in permeability

Including a factor for grain size reduction

Permeability loss with depletion in GOM

Field Z

© Cambridge University Press (Fig. 12.14, pp. 408)Zoback, Reservoir Geomechanics

Idealized resevoir study

© Cambridge University Press (Fig. 12.15, pp. 410)Zoback, Reservoir Geomechanics