Geometis
Quantify
Testif-I
Sandwich Box Vibrator
Test System
ProMAX Field Data Processing System
Geomatrix
Geodetic Conversion Programs
Quantify
Overview
QUANTIFY is offered by
The Vision
Group for
post-project auditing, and checking of navigation, and positioning
data. It comprises a suite of software modules that range in
function from auditing to reprocessing to mapping to archiving. The
deliverable products may be accessed with standard “off the shelf”
software applications.
Whenever
dealing with a large data volume such as a 3D seismic survey, loading
seismic tapes, examining shot point/file ranges, and compiling a list
of lines present, missing, or potentially problematic are the normal
front-end functions of a processing, reprocessing, archiving task.
Quantify has proven that the positioning data set is an efficient
means of cataloguing a seismic survey and improving the turn around
time for a project.
Auditing
& Archiving
The first process is essentially an audit that uses the positioning
data set to describe the seismic data set.
The auditing process is essential for a good archive to be
established. Ancillary data such as observer’s
logs, positioning notes, post-plot maps and stacked data may be saved
as graphic files. These files may then be
linked to the line list for the data volume.
Verification,
QC/QA, Fold Analysis
The verification procedure is a quality assurance task that examines
the positioning files for irregularities. Noisy positioning, suspect
geometry, gaps in the data, and missing shots may be identified.
Mapping and fold analysis take a detailed look at how well the seismic
data covers the survey area. This qualitative procedure may determine
whether or not a vintage survey is a candidate for reprocessing.
More intensive quality assurance work may be conducted by using first
break analysis to examine suspect areas. The verification process will
point to problematic lines in the data volume to receive immediate
attention versus detective work directed at an intermediate process,
or worse, an attempt at a final product.
Reprocessing
& Speciality Positioning Services
QUANTIFY has been used to
produce input files for repopulating seismic headers with datum
shifts and geometry corrections. Input and output
formats may be user specified, seismic tape header
dumps, or standard positioning formats. An important application is to
dump seismic headers from tapes with little
or no support data for an evaluation.
Enhanced seismic positioning (ESP), is a module of QUANTIFY. This
product is used to adjust marine source
positions from the physical center of the source to the center of
power. A recent project dealt with very
elongate source geometry utilized in a multi-streamer configuration.
The frequency content needed to image a
shallow target was improved by adjusting the source positions
in order to eliminate destructive phase differences caused by the
source geometry.
What
to Expect
- A detailed line list for data
handlers to use not develop
- First look QC/QA for a heads up on
problematic data
- Capabilities for in depth analysis
and reprocessing if required
- An archive for a project on CD ROM
that provides quick access to support data and saves
storage space
- Reduced turnaround time
- Cost reductions by eliminating
surprises and having to repeat a process
Deliverables
(Example for a typical marine
3D survey):
- CD ROMS (two copies) for the project
containing:
- Aerial coverage plots (two flex
schemes)
- Columnar coverage plots (one
flex scheme)
- Final report (if requested and
provided by client)
- Final P190 coordinates in local
and second datum.P2/91s and or other raw data files and
scanned OBs (if requested and provided by client)
- Parameters, diagrams and line
lists in Excel. spreadsheets
Additional
Services
- Processing raw positioning data into
final navigation data
- Building final positioning files
from SEG external headers
- Datum shifts carried out on standard
SEG and UKOOA formats
- Identifying essential and
non-essential positioning data in storage
- Reformatting and
transcription.Forensic QC
- Production of an audit spreadsheet
that shows:
- Line name
- FSP and LSP
- Direction number of calculated
shots, missing shots
- List of missing shots
- Year, month, day, hour, minute,
second
- Link line name to jpeg files of
logs to seismic field tapes and with processed data.
- Production of a QC spreadsheet that
quantifies:
- Consistency with all positioning
element intervals
- Source and streamer separations
- Streamer shaping/modeling
- Production of tabular ASCII files
that may be used to graph any problem areas.
- First break analysis and marine
geometry analysis
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