Crown Minerals Pleased with South Island Survey

New Zealand Crown Minerals said that it has successfully completed an offshore seismic survey off the southeast coast of the country's South Island as part of a blocks offer planned for the Great South basin later this year.

The government-sponsored seismic survey, DUN06, was completed with the acquisition of 3,160 kilometers of 2D seismic data. "At the end of the day the survey was a tremendous success," said Ricardo Bertolotti, the Crown Minerals geophysicist who was responsible for the survey. "We have accomplished all our goals and more."

Crown Minerals contracted Multiwave Geophysical to acquire the data using the company's 65-meter vessel Pacific Titan. A 6-kilometer-long solid-state streamer was used. DUN06 includes a grid off the coast between Dunedin and the Catlins, as well as lines that extend into the heart of the Great South basin.

The survey area was chosen to test the prospectivity of the area between the Great South and Canterbury basins. "Looking at the raw data suggests that the basin extends to the northeast providing potential for hydrocarbon prospectivity," said Bertolotti.

Data were acquired in the heart of the Great South basin to provide modern data to accompany the early 1970ís Hunt data. Bertolotti says. "This new data will complement the Hunt data by providing better imaging of the geology through to basement than was previously available. We also tied the seismic to several wells." Wells that were tied included Tara-1 and Toroa-1, both of which had strong oil and gas shows, and and Kawau-1A, which was a gas discovery.

The seismic survey was acquired in the area that will shortly be opened for the Great South basin blocks offer. Crown Minerals said that the the data will be made freely available to interested parties in order to help facilitate a successful blocks offer over the highly prospective Great South basin. GNS Science won the contract to process the survey. Processing should conclude by August 2006. In addition, GNS will re-process approximately 8,000 line kilometers of existing 2D data that will also be made freely available to all interested parties.

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