Subsidence above a compacting reservoir

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Extraction of underground resources (oil, gas, water, coal, etc.) can cause reservoir's compaction that can lead to the subsidence of the above surface. Such phenomena at a certain important degree may lead to the damage of the civil and petroleum structures installed above the compacted reservoir (buildings, roads, tunnels, petroleum platform, casing and cement sheath, etc.). Compaction of a fluid reservoir during the production process and related subsidence can be modeled as functions of the reservoir's fluid pressure decrease, reservoir's geometry and rock's properties (Geertsma, 1973; Rudnicki, 1999; Fjaer et al., 2008).

Below, an online tool is provided, on the basis of the famous strain nucleus model (Geertsma, 1973), for modeling the subsidence above a disk-shaped reservoir that is defined by a radius R, a thickness H and the static drained isotropic elastic properties (Young modulus E and Poisson ratio ν, note that elastic properties derived from compressional and shear sonic wave velocities need to be corrected with saturation and dynamic effects). The reservoir is located at a depth D and has a fluid pressure decrease of δP.



References
Fjaer, E., Holt, R. M., Raaen, A. M., Risnes, R., & Horsrud, P. (2008). Petroleum related rock mechanics (Vol. 53). Elsevier.
Geertsma, J. (1973). Land subsidence above compacting oil and gas reservoirs. Journal of Petroleum Technology, 25(06), 734-744.
Rudnicki, J. W. (1999, January). Alteration of regional stress by reservoirs and other inhomogeneities: stabilizing or destabilizing?. In 9th ISRM Congress. International Society for Rock Mechanics.

Subsidence above compacting oil and gas reservoir.
Subsidence above a compacting oil and gas reservoir.


Input the parameters then click the Compute button to run the simulation.


Reservoir's depth D (m)

Reservoir's radius R (m)

Reservoir's thickness H (m)

Drained Young modulus of reservoir's rock (GPa)

Poisson ratio of reservoir's rock

Reservoir's fluid pressure reduction δP (MPa)



Use the slider below to smoothly modify the reduction of the reservoir's fluid pressure δP (Note: this option works on most internet navigators except some Internet Explorer versions):