What does VECON do?
VECON provides a powerful model builder to
quickly and easily create a 2D or 3D velocity model from a
variety of input data types and sources. VECON then uses this
model, along with the well trajectory, to help you design the
optimum source-receiver geometry for your VSP survey by tracing
rays, and model any imaging problem.
The 2D/3D finite-difference modeling in VECON
graphically illustrates wavefield propagation through your model
helping you understand many survey design or interpretation
What kind of computer do I need to run
VECON is a JavaTM program and is
currently available for any Windows 7 Professional 64bit or Linux. For Windows, it requires at least 2GB of RAM,
and a minimum CPU of 1 GHz. We also recommend a minimum of
1 GB of hard drive storage space. The Linux version
requires CentOS 5.x or up for single or multiple licenses. You may check the System Requirements document for a list of OS and machine requirements.
Is it difficult to install VECON?
There is no installation required for the
Windows version. Simply copy the VECON folder from the software
CD or extract it from the downloaded archive, and then you are ready to run the program. You must also
obtain a license key from GeoTomo which is required to run the software. This small file can be sent
via email and is placed in the VECON/license folder.
The Linux version is also quickly
installed but is usually performed by your system administrator
as some steps may require root privileges.
How do I obtain a VECON license key?
For Windows, we need to know the hostid of
the computer you be using for VECON. A utility program is
provided to obtain this information for you. First, open a
Command Prompt window. Inside the window, move to the
VECON/utilities folder and enter the following
command: lmutil lmhostid
Email the number returned to
email@example.com and a license key will be generated and
sent via email. Place the key file in the VECON/license
folder. No other steps are required.
When I run VECON, I get the following
error message: ˇ°java.lang.Exception: Failed to read the license
key. License Failed!ˇ±.
This message means that VECON has found a
license key but it does not match your computer. Make sure you
have not altered the key in any way. Also, adding or changing
your computer hardware may require that you obtain a new key.
If you suspect this is the problem, repeat the steps for
obtaining a key to see if the hostid number has changed. If so,
you will need to obtain a new license key from
What information do I need to build a 2D
model in VECON?
2D models can easily be built interactively
in VECON. You can draw the 2D layers, faults and objects
ˇ°freehandˇ±. You can also load seismic data (SEGY) or a
cross-section in gif or jpg format. By picking along the
seismic data or image you quickly build the layers for your 2D
model. You will also need P-wave velocities for the layers and
objects in your model. VECON also allows you to specify layer
densities, Vp/Vs ratio and velocity gradients, but these can be
defaulted if you choose.
You can also load 2D interface data from
several other vendor packages. Check with
firstname.lastname@example.org for additional details.
What information do I need to build a 3D
model in VECON?
VECON 3D models can be built from
intersecting 2D models. All the options listed above are
available for constructing cross-sections used to build your 3D
model. You can also import ASCII 3D interface maps from
your interpretation system to either build a model directly or
to aid in building cross-sections for the 3D model.
Another way to construct 3D models is by digitizing contour maps
directly in the 3D model builder. You will also need P-wave
velocities for the layers and objects in your model. VECON also
allows you to specify layer densities, Vp/Vs ratio and velocity
gradients, but these can be defaulted if you choose.
You can also load 3D models from some other
vendor packages. Check with
email@example.com for additional details.
Can VECON generate synthetic traces for
input to another software package?
Synthetic traces can be generated by either
the wavefront raytracer or the finite-difference modeling in
VECON. The 2D raytracer generates 2-component synthetics and
the 3D raytracer 3-component synthetics. 2D/3D acoustic
finite-difference synthetics record the pressure response of the
model. 2D/3D elastic finite-difference synthetics record the
vector response of the model. 2D VTI/TTI/HTI anisotropic
finite-difference synthetics are also available. All synthetics
are written in standard SEGY format.
What information is contained in the
VECON synthetic traces?
In addition to the wavefield contained in
the trace data, all geometry data and traveltimes of all the
seismic phases is written to the standard SEGY trace headers.
Does VECON treat land and marine cases
When creating a new VECON model you must
specify if it is Land or Marine. For land models the first
layer in the model is assumed to be the surface topography. You
can build the topography interactively or load it from an ASCII
file. For marine models, sea level is automatically defined at
depth zero. The first layer in the model is assumed to be the
sea floor. A water velocity is automatically assigned but can
be edited if necessary.
The acquisition geometry I need to model
is ˇ°non-standardˇ±. Can VECON handle this?
VECON provides tools to define most
standard VSP geometries, including reverse and normal-incidence
surveys. Receivers are positioned at regular intervals in the
borehole. Shots can be placed at regular intervals along or
below the surface or a layer in your model. Editors are
available to change individual shot or receiver coordinates if
required for a ˇ°non-standardˇ± survey.
What types of 3D acquisition geometry
does VECON support?
Templates in VECON make it easy to define
rectangle, circle, spiral and single-well 3D VSP surveys.
Editors are also available to change individual shot or receiver
coordinates if required for other survey geometries.