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SEG-Y seismic
www.sarig.pir.sa.gov.auSEG-Y seismic:
new data layer in SARIG
Michael Ross1 and Peter Hough2
1 Minerals Information and Promotions Branch, PIRSA 2 Petroleum Geophysics Branch, PIRSA
Introduction
PIRSA has recently developed a
new layer in SARIG to view and
download processed SEG-Y open le
(non-condential) seismic data. The
SEG-Y le format is an open standard
developed by the Society of Exploration
Geophysicists for storing and viewinggeophysical data. This exciting
development enables web viewing of
processed seismic data not previously
possible from PIRSA. Downloading the
SEG-Y data will allow users to further
manipulate the display of the seismic
data to suit requirements.
This data supplements the following
free data downloads already available inSARIG:
current mineral, petroleum and
geothermal exploration and
production tenements
expired mineral, petroleum and
geothermal exploration tenements
and associated non-condential
company reports
drillhole, geology, mineral depositsand sampling analyses
Figure 1 SARIG screen shot of new 2D SEG-Y data layer over pre-Tertiary sedimentary basins.
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state geophysical imagery (magnetic,
gravity, radiometrics)
seismic survey company reports
seismic depth, time and isopach
imagery.
Once exclusive to the petroleumindustry, processed seismic data is now
available for easy use without the need
for sophisticated hardware platforms,
software requirements or prior
extensive knowledge and experience of
the geophysical recording technique.
Since 1975 there have been over
350 2D seismic surveys recorded
producing more than 110 000 km of
line prole data over the main onshore
sedimentary basins in South Australia.
While much of this activity has been
concentrated on the deeper parts of the
basins a percentage has encroached into
areas now deemed to be prospective
for other commodities and targets such
as uranium, coal seam methane, base
metals and geothermal energy.
Most surveys have been recordedunder the Petroleum Acts of the
day. Under the regulations relating to
these Acts, basic data is made public
2 years post the recording of the survey.
Key datasets that are covered by this
requirement include line location,
processed data and various operational
reports.
2D SEG-Y data
To date, datasets have beenconsolidated, edited and uploaded for
the following basins (Fig. 1):
Ofcer
Pedirka
Eromanga
Arckaringa
Arrowie
It is anticipated that data for the
Otway, Murray, Stansbury and Cooper
basins, and Gawler Craton will beavailable in SARIG in the near future.
SARIG displays the actual extent of
the processed data which may at times
not be the same as the nominal/original
full extent of the line, i.e. it may be a
shortened reprocessed version.
How to access 2D
SEG-Y data in SARIG
To gain access to 2D SEG-Y seismic
data in SARIG, begin by selecting itsdata layer under Seismic Lines (Fig. 1).
Figure 2 SARIGscreenshotshowingseismicline84-XFEovercurrentmineralexplorationlicencesandcoalfeldsintheArckaringaBasin.
(Note: steps 6 and 7 are shown in Figures 4 and 5).
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SEG-Y seismic
The case study example is for
seismic line 84-XFE within the
Arckaringa Basin. Figure 2 shows this
line in SARIG over current mineral
exploration licences and coaleld
layers. The steps to access line 84-XFE
are shown in Figures 26 and are
summarised below.
Select the Identify tool from the
Search/Identify menu (Fig. 2).
Select the line(s) of interest on the
map (Fig. 2).
A Results window for the selected
features appears on the screen
(Fig. 2). In the window there are
three hyperlinked elds shown
as blue underlined text. PIRSA
suggests using these in the
following sequence to view and
download the SEG-Y data.
JPEGfle. Provides a quick
preview A4 .jpg image of theseismic data without having to
download the larger seismic
dataset (Fig. 3).
Note the image is representative
only as the data has been adjusted
to always t an A4 page.
Line. Returns a list and le size
of SEG-Y datasets for the selected
line (Fig. 4).
Note that there may be more than
one version for some lines.
To download the SEG-Y format
data, select the required record
from the list shown in Figure 4.This returns a download screen
shown in Figure 5.
Note that a SEG-Y viewer is
required to view the downloaded
SEG-Y data le. SARIG provides
links to two suggested free viewers
(Fig. 4).
Select the download hyperlink
option shown in Figure 5 to show
line 84-XFE in a SEG-Y viewer
(cropped) where users can further
manipulate the data (Fig. 6).
1
2
3
4
Figure 4 Returned list of SEG-Y datasets for seismic line 84-FXE (line shown in Fig. 2).
Figure 3 A4-size
preview of JPEGimage of SEG-Y
data for seismic line
84-XFE.
5
6
7
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Note that Microsoft Internet Explorer continues to
present challenges to the SARIG development team and
users may experience download issues. PIRSA suggests
using Mozilla Firefox or Google Chrome which provide
best overall performance for SARIG.
CompanyReport. The company report column shown in
Figure 2 returns a list all downloadable open le reports
for this seismic survey in .pdf format.
Province-based SEG-Y datasets
PIRSA can also provide more comprehensive province-based
SEG-Y datasets to assist explorers in the assessment of their
licence areas. Datasets are available for the Arckaringa,
Arrowie, Cooper, Duntroon, Ofcer, Otway, Pedirka and
Stansbury basins. For more information see the PIRSA
Petroleum website . Go
to Products & Data, Seismic Data, Seismic Workstation
Datasets. Prices range from $5001000.For further information contact Peter Hough,phone +61 8 8463 3240, email
8
Figure 6 SEG-Y viewer example for seismic line 84-XFE (cropped to section area).
Figure 5 DownloadingwindowSEG-Ydatafle.