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WORKSHOPS
As
a service to our sponsors, and to the community in general,
we organize workshops on topics in potential fields that
have been advanced by CGEM and are of broad interest in
industry. The workshops feature CGEM speakers as well as
guest speakers from around the world. These workshops provide
a forum for us to present latest CGEM research results,
introduce new methodologies to the potential-field community,
and for potential-field geophysicists to interact with each
other. To encourage students' interest in potential-field
methods, we always welcome students to attend the workshops
free of charge.
September
27, 2007: SEG
Workshop on 4D Gravity Monitoring of Reservoirs and Aquifers
This
recent workshop focussed on recent advances in gravimeter
technology and the emerging need for characterizing the
dynamic changes of subsurface systems have led to increased
application of microgravity method in time-lapsed monitoring,
also known as 4D gravity. Various groups have applied 4D
gravity to ground water aquifers of small scales to large
oil and gas reservoirs with noticeable success. However,
specifics of the technology are still being developed and
data sets are rarities. Huge potential in both research
and application lies ahead. This workshop aims to bring
together the researchers, practitioners, and users of 4D
gravity from academia and ground water and petroleum industries
to present and discuss the emerging technology. The goal
is to provide a forum for presentation of the state-of-art
of instrumentation, field survey methods, and data interpretation.
With this backdrop, the workshop hopes to facilitate the
interaction between different groups and
foster rigorous discussion on the future direction of the
technology.
July
26, 2002: Workshop
on Automatic Depth Estimation Techniques in Potential Fields
This
workshop focussed on the automatic depth estimation techniques
in potential-field methods. This is a class of techniques
that can rapidly process large data sets and provide first-order
information about the source depth. The presentations at
the workshop include overviews on depth estimation, traditionally
available methods, as well as the newly developed Extended
Euler deconvolution. The Proceedings CD is currently available
for distribution.
October
27, 2000: Application
of Wavelets in Potential Fields: A Global Virtual Workshop.
This
was the first workshop presented by GMRC. The theme was
on the application of wavelets in potential fields. We organized
the workshop to provide participants with basic background
on wavelet transforms and then focussed on three major areas
of application:
(1)
Data filtering based using wavelets,
(2)
Fast numerical algorithms using wavelet compression, and
(3)
Interpretation techniques using natural wavelets.
This
was a virtual workshop that featured seven speakers from
four countries including Australia, France, and United States.
The entire workshop was broadcast via internet to eleven
sites in five countries that hosted over 100 participants.
The Proceedings CD is currently available for distribution.
SOFTWARE
One
emphasis of CGEM is technology transfer. Besides the usual
approach of providing our sponsors with annual reports and
detailed technical reports on different projects, we are
committed to delivering one program package each year. The
objective is to transfer the technologies resulted from
research back to our sponsors for practical applications.
These
packages are not the typical research programs. Instead,
we take the codes generated from the research phase and
further develop them into near commercial quality softwares
that are fully tested and documented (FORTAN). The included
Graphic User Interface (GUI) enables these delivered programs
to be used directly in active exploration projects without
the need to integrate them into sponsors' existing softwares.
Brief descriptions of these packages are provided below.
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CGEM
Application : A Graphical User Interface for incorporating
EEDECON & GG3D
CGEM
Application is a program libary designed to estimate and
remove the noise contaminating gravity gradiometry data.
The automatic denoising algorithm utilizes the discrete
wavelet transform based on orhtonormal, compactly supported
wavelets such as Daubechies wavelets or symmlets. It operates
on data profiles so that the noise in data can be removed
before they are gridded for subsequent processing and interpretation.
The manual/documentation
(draft) for the GGDNS software
package is available for download.
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GGDNS:
A Program Library for Estimating and Removing Noise
from Gravity Gradiometry Data
GGDNS
is a program libary designed to estimate and remove the
noise contaminating gravity gradiometry data. The automatic
denoising algorithm utilizes the discrete wavelet transform
based on orhtonormal, compactly supported wavelets such
as Daubechies wavelets or symmlets. It operates on data
profiles so that the noise in data can be removed before
they are gridded for subsequent processing and interpretation.
The manual/documentation
for the GGDNS software package is available for download.
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EEDECON
estimates the depth to source based on Extended Euler
deconvolution of magnetic data. There are two main
variants of this program. In the first variant, the
structural index (SI) is specified and the program
solves for source location (x0 , y0 , and z0) and
background values. In the second variant, the SI is
also considered as an unknown and the program solves
simultaneously for it together with the source location.
The GUI allows the user to easily input a grid file
in GXF format, specify an output file, and select
an Extended Euler deconvolution method with parameters.
It then automatically calculates derivatives and the
generalized Hilbert transform, and carries out Euler
deconvolution.The manual/documentation
for the EEDECON software package is available for
download.
GG3D:
A Program Library for 3D Inversion of Gravity Gradiometry
Data
This
program inverts for density contrast distribution from multi-component
gravity gradiometry data. The program has the capability
to impose lower and upper bounds on the inverted density
contrast. It also allows arbitrary data locations for maximum
flexibility. We have also incoporated wavelet compression
to speed up the inversion and increase the size of the problems
that can be solved. The manual/documentation
for the GG3D software package is available for download.
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