Abstract
The Waka Nui-1 petroleum exploration well, about 90 km west of Northland, is the only offshore well north of Auckland and provides important lithologic and age control for interpretations of seismic reflection surveys in the petroleum-prospective Northland and Reinga basins. It is especially important because it intersects a nearly complete Cenozoic sequence and Mesozoic Murihiku Supergroup rocks, all of which may be part of the petroleum system in these basins. Correlation with seismic data is uncertain because neither sonic logs nor check shot data were acquired during drilling operations. This short communication documents the development of a two-way time– (TWT–) depth relationship derived by careful analysis of stacking velocities from nearby petroleum industry seismic data and logging-while-drilling logs from Waka Nui-1. Using this correlation, the age and lithology data from the well can be used to infer the age of unconformities and seismic sequences on seismic data in the Northland and Reinga basins. These interpretations provide control on the timing of structural events and the evolution of depositional processes in this region of extensive sedimentary accumulation and are vital for predicting the prospectivity of the basins.
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