HOUSTON -- Mariner Energy has made a deepwater discovery on its Geauxpher prospect in Garden Banks block 462. The well, which lies in water depths of 2,700 ft (823 m), was drilled to 23,156 ft (7,058 m) TD. Mariner estimates the field's gross proved and probable reserves on the block to be approximately 100 bcfe of natural gas. According to the company, development is under way with initial production expected by year-end 2008.
The drilling rig remains on location and a second well is planned to delineate the extent of the discovery. Mariner has identified additional potential on the block and expects to test these amplitudes over time.
Mariner has also expanded its deepwater prospect inventory, farming into the Heidelberg Miocene subsalt prospect with a 12.5% interest. Heidelberg is operated by Anadarko Petroleum Corp. on Green Canyon blocks 816, 859, 860, and 903. An exploration well is expected to spud on the acreage by year-end 2008, the company says.