Post-mortem on Titihaoa-1, Wairarapa

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Uruski, C.I. 1997 Post-mortem on Titihaoa-1, Wairarapa. Lower Hutt: Institute of Geological & Nuclear Sciences. Institute of Geological & Nuclear Sciences science report 97/31 12 p.

Abstract: Several mysteries surround the Titihaoa-1 well, drilled in 1994 off the Wairarapa coast. The pre-drilling prognosis underestimated the thickness of the Neogene succession by a minimum of 135% and dry gas was encountered in the well at nearly 2000 m depth. It has been suggested that the gas may have a biogenic origin, then a special case must be argued to explain the absence of higher hydrocarbons. At present, the volume of gas in the Titihaoa structure is unknown as flow rates were not tested and neither of the original target horizons were reached by drill. This article explores the information available at present and suggests that the Titihaoa structure deserves closer examination. This report examines the data available so far and is intended as a basis for future work. (auth)