Geertsma's Model

Matlab implementation of Geertsma's equation for subsidence and inflation of a reservoir in a homgeneous medium.

Geertsma

Matlab implementation of Geertsma's equation (Geerstma, 1973) for subsidence and inflation of a reservoir in a homgeneous medium. In-line syntax is described in the comments. See the files for further documentation.

• 'Geertsma_Checklist': runs a quick check on the functions.

• 'Geertsma_Exact': calculates the vertical compaction on the line above and below a compacting disc

• 'Geertsma_Example': runs a numerical example, with some plot suggestions.

• 'Geertsma_Symbolic_ToolBox': modeling function, with detailed explanation. Use this if you have the symbolic toolbox installed

• 'Geertsma_No_ToolBox': modeling function, with detailed explanation. Use this if you do not have the symbolic toolbox installed. Accuracy is slightly worse.

• Other functions are numerical implementations necessary in the absence of the Symbolic Toolbox.

Author:

Filipe Borges ([e-mail]), 
Norwegian University of Science and Technology.

Updatde History:

- 14/11/2018: Added code to calculate Heuman Lambda Function (end of main code).

References:

Fjær, E., R. M. Holt, A. Raaen, R. Risnes, and P. Horsrud,
   2008, Petroleum related rock mechanics: Elsevier, 53.

Geertsma, J., 1973, A basic theory of subsidence due to
  reservoir compaction: the homogeneous case: Verhandelingen
  Kon. Ned. Geol. Mijnbouwk. Gen, 28, 43-62.