Abstract
The Reinga/Northland Basin is located offshore northwest of New Zealand, adjacent to the petroleum producing Taranaki Basin. Water depths range from shelfal to more than 2,000 m. Analysis of a large multichannel 2D seismic-reflection dataset, tied to Taranaki Basin, constrains seismic stratigraphic units and unconformities formed during successive deformational events in the region. Five phases are identified. Phase one: extension that created major northwest-trending structures. The age of the graben-filling sediments is inferred to be Jurassic and/or Cretaceous. Source rocks are interpreted to have been deposited widely during this phase. Phase two: Late Cretaceous to Late Eocene regional subsidence with increasing marine influence in the Reinga region. Source and reservoir successions are inferred to have been deposited during this interval. Phase three: Late Eocene compression resulted in folding of the northwest Reinga region. Phase four: Oligocene to Early Miocene regional subsidence and emplacement of the Northern Allochthon and eruption of the Northland Volcanic Arc in earliest Miocene time. The Early Miocene deformation and volcanism relate to development of the subduction zone to the northeast of the basin. Reservoir facies were deposited in regions affected by deformation and seal facies were deposited in distal regions. Phase five: From the mid-Miocene to the present day subsidence continued in the Reinga Basin with deposition of pelagic sediments. Uplift of the Wanganella Ridge, in the northwest part of the Reinga region in the Middle Miocene and intermittent deformation in the northeast through to Pliocene time resulted in localised deposition of channel and fan reservoir facies.
Published Version
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