Topic:
What are the differences between ASAP and AutoPix?

Description:
 

Solution:
ASAP:
-----

ASAP (Automatic Seismic Area Picker) was developed originally within the
Charisma geophysical interpretation software package. ASAP works in the 3D-space
and makes intensive use of seismic data in RAM. 

ASAP looks for correlations between traces according to the parameters and
constraints given by the user. Once a seed-point is defined, the search goes
spatially in every direction within the constraints. When a pick is found within
the defined ranges, it becomes a new seed for a new search and so on. 

ASAP works very fast.  A good horizon can be picked usually within a few seconds
to a few minutes depending on the size of your survey(s). 

A feature that is new to IESX with the integration of ASAP is the 'origin
of interpretation'. This allows the program to keep track of what process
generated the picks. So if an automatic ASAP run fails due to wrong parameters,
the original seedpoints are not overwritten and the user can delete only the
picks that have been generated by ASAP. ASAP also keeps a 'parent/child'
relationship.  This makes it possible to identify the source of a seedpoint.

In ASAP you can work in a 'paintbrush' mode on the Basemap. This is a
powerful feature that enables you to run ASAP in an interactive mode. Once
the ASAP parameters and constraints have been defined, you can define a
small square (a 'paintbrush') and drag it with the mouse. ASAP then runs only
within the restraints of the 'paintbrush'.  Alternatively, you can run ASAP 
with inclusion and exclusion paths.

For IESX 11.0 you can access ASAP from the Basemap, GeoViz and from the
Application Manager. 

Please note that there is no way (or need!) to display the ASAP picks on
the seismic while ASAP is running, since it is looking for picks in a 3D
space.

AutoPix:
--------

AutoPix works along each line tying loops from each seedpoint to the adjacent
two lines by correlating the traces using user defined parameters, creating new
seedpoints and generating new picks according to the parameters and constraints
defined by the user. It is simple but effective. 

A useful feature of AutoPix is that the results can be displayed while
AutoPix is looping through the lines on both Basemap and Seis3DV/2DV (however, 
this makes the run slower). It is also possible to use AutoPix in a batch mode 
for several horizons at the same time (this is not possible in ASAP).

AutoPix will stop at a fault segment or fault polygon if there is one
interpreted for a given line.


Both ASAP and AutoPix work based on correlation & cross-correlation techniques.
ASAP has a correlation option that is similar to the AutoPix algorithm. If
cross-correlation is used without the snap-to-event button toggled on, then ASAP
will first pick the event based on amplitude (or phase), and then adjust to the
maximum correlation, which may not necessarily be the event.


ASAP					AutoPix
----					-------
Requires special licenses.		No license required.

Tracks one or more events within a	Picks only in an inline manner.
seismic volume.

Provides multiple parameter options	A batch autotracking tool, yielding 
for rapid surface generations, with	simultaneous, accurate interpretations
full control over phase differences,	and attribute extractions across
faulted zones, and correlation time	multiple horizons.
gates.

Accesses seismic data from disk or	Accesses seismic data from disk.
memory.

Expanded options to guide the 		More refined collision capabilities,
tracking process in areas with poor	resulting in higher quality pick.
data quality.

Stops at fault cuts.			Stops at fault cuts.




Last Modified on: 03-DEC-98