Capreolus-2 3D Marine Seismic Survey 2020 - 2023

Closed 9 Sep 2020

Opened 10 Aug 2020


FROM NOPSEMA: This is the second Capreolus-2 activity being published on the NOPSEMA website.
TGS-NOPEC Geophysical Company Pty Ltd (TGS) decided to make a number of modifications to the original Capreolus-2 3D Marine Seismic Survey (MSS) and as such NOPSEMA has decided that the activity requires an extra public comment period.
The modifications include both spatial and temporal changes:
~ altering the south-eastern boundary of the Acquisition Area and Operational Area to include a new area of interest, located to the east of the current Operational Area covering the Dorado field; and
~ extending the EP timeframe by 12 months, to allow for the seismic acquisition to occur in phases between 2020 and 2024

TGS-NOPEC Geophysical Company Pty Ltd (TGS) is proposing to undertake the Capreolus-2 three-dimensional (3D) marine seismic survey (MSS) in Commonwealth waters of the Carnarvon Basin. The purpose of the Capreolus-2 3D MSS is to collect high quality geophysical data about rock formations and structures beneath the seabed and assess potential for new oil and gas discoveries.
The Capreous-2 3D MSS is a typical 3D survey using methods and procedures similar to others conducted in Australian waters. No unique or unusual equipment or operations are proposed.
The Acquisition Area comprises the area within which 3D seismic acquisition will be undertaken and covers approximately 26,897 kilometres squared (km2). The Acquisition Area is surrounded by a larger Operational Area (41,266 km2), for the purpose of line turns, run-ins, run-outs, seismic testing and support activities. The Operational Area at its closest is approximately 88 km north of Karratha and 118 km north-west of Pardoo. The seismic survey will be undertaken in water depths between approximately 50 m to 1,133 m.
The survey will involve a single seismic survey vessel towing a seismic source array with a total volume of 3,480 cubic inches (in3). The seismic source will use compressed air to emit regular pulses of sound that reflect off the seabed and underlying rock formations. The reflected sound wave will be received by up to 12 hydrophone streamers. During the survey, the seismic survey vessel will travel at a speed of approximately 4 to 5 knots, discharging the seismic source approximately every 5 seconds. The survey vessel will typically acquire seismic data along a series of adjacent and parallel lines in a “racetrack” pattern. At the end of each line, the vessel will turn in a wide arc to position for another parallel line in the opposite direction. This pattern is repeated until the required coverage is completed.
The Capreolus-2 3D MSS may commence as early as October 2020 and will be completed before 31 December 2024. Up to a maximum of 10,000 km2 may be acquired per calendar year between 2020 and 2024 (up to a total of 26,897 km2). It is estimated to take between approximately 95 and 190 days to acquire 10,000 km2 (including contingency time for potential vessel or equipment down time and adverse weather conditions). The precise timing of the survey is subject to NOPSEMA’s acceptance of the EP, weather conditions, vessel availability and other operational considerations, and will take into account the seasonality of environmental sensitivities, where practicable.

Providing your comment

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