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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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SARIG

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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SARIG

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.