mirror of
https://github.com/wassname/simpeg.git
synced 2026-06-28 05:43:26 +08:00
Lindsey Heagy
59 lines
2.0 KiB
ReStructuredText
59 lines
2.0 KiB
ReStructuredText
.. _examples_EM_Schenkel_Morrison_Casing:
|
|
|
|
.. --------------------------------- ..
|
|
.. ..
|
|
.. THIS FILE IS AUTO GENEREATED ..
|
|
.. ..
|
|
.. SimPEG/Examples/__init__.py ..
|
|
.. ..
|
|
.. --------------------------------- ..
|
|
|
|
|
|
EM: Schenkel and Morrison Casing Model
|
|
======================================
|
|
|
|
Here we create and run a FDEM forward simulation to calculate the vertical
|
|
current inside a steel-cased. The model is based on the Schenkel and
|
|
Morrison Casing Model, and the results are used in a 2016 SEG abstract by
|
|
Yang et al.
|
|
|
|
- Schenkel, C.J., and H.F. Morrison, 1990, Effects of well casing on potential field measurements using downhole current sources: Geophysical prospecting, 38, 663-686.
|
|
|
|
|
|
The model consists of:
|
|
- Air: Conductivity 1e-8 S/m, above z = 0
|
|
- Background: conductivity 1e-2 S/m, below z = 0
|
|
- Casing: conductivity 1e6 S/m
|
|
- 300m long
|
|
- radius of 0.1m
|
|
- thickness of 6e-3m
|
|
|
|
Inside the casing, we take the same conductivity as the background.
|
|
|
|
We are using an EM code to simulate DC, so we use frequency low enough
|
|
that the skin depth inside the casing is longer than the casing length (f
|
|
= 1e-6 Hz). The plot produced is of the current inside the casing.
|
|
|
|
These results are shown in the SEG abstract by Yang et al., 2016: 3D DC
|
|
resistivity modeling of steel casing for reservoir monitoring using
|
|
equivalent resistor network. The solver used to produce these results and
|
|
achieve the CPU time of ~30s is Mumps, which was installed using pymatsolver_
|
|
|
|
.. _pymatsolver: https://github.com/rowanc1/pymatsolver
|
|
|
|
This example is on figshare: https://dx.doi.org/10.6084/m9.figshare.3126961.v1
|
|
|
|
If you would use this example for a code comparison, or build upon it, a
|
|
citation would be much appreciated!
|
|
|
|
|
|
|
|
.. plot::
|
|
|
|
from SimPEG import Examples
|
|
Examples.EM_Schenkel_Morrison_Casing.run()
|
|
|
|
.. literalinclude:: ../../SimPEG/Examples/EM_Schenkel_Morrison_Casing.py
|
|
:language: python
|
|
:linenos:
|