Title: |
Inverse Modeling of Fractured Geothermal Reservoirs Using Pressure Interference Data |
Authors: |
Shinsuke Nakao, John W. Pritchett, and Tsuneo Ishido |
Conference: |
Stanford Geothermal Workshop |
Year: |
2003 |
Session: |
Modeling |
Language: |
English |
File Size: |
806KB |
View File: |
|
Numerically inverting simultaneous pressureinterference
measurements from multiple observation
wells can help to establish the large-scale spatial
distributions of permeability and storage within a
geothermal reservoir. For realistic results, it is
important to incorporate double-porosity (MINC)
descriptions into the modeling process to properly
reproduce the short-term pressure-transient response
to production or injection. A new finite-difference
inversion program has been developed for this
purpose. The reservoir is represented as a threedimensional
network of grid blocks, and the
description is restricted to single-phase (liquid) flow.
The single-phase limitation permits the linearization
of the pressure-diffusion equation in the sub-grid
ėmatrix regionî, so that MINC descriptions may be
accommodated at little additional computing cost.
The ėsimulated annealingî method is used as the
optimizing technique.
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