2019
DOI: 10.1016/j.marpetgeo.2019.03.035
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Depositional and organofacies influences on the petroleum potential of an unusual marine source rock: Waipawa Formation (Paleocene) in southern East Coast Basin, New Zealand

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Cited by 21 publications
(91 citation statements)
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“…The Waipawa Formation is a widespread source rock in New Zealand basins, represented by about 2 to 80 m thick marine mudstone. Higher contributions of terrestrial (mainly woody) plant matter are indicated by higher land plant biomarkers and high phenol/naphthalene ratios [39]. The presence of a Late Paleocene source rock in the study region is confirmed by Ariki-1 well, where the Waipawa Formation is represented by a 12 m thick organic-rich marine shale located at depth of 4122-4134 m with total organic carbon (TOC) averaging 3.6 wt% [40].…”
Section: Figurementioning
confidence: 67%
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“…The Waipawa Formation is a widespread source rock in New Zealand basins, represented by about 2 to 80 m thick marine mudstone. Higher contributions of terrestrial (mainly woody) plant matter are indicated by higher land plant biomarkers and high phenol/naphthalene ratios [39]. The presence of a Late Paleocene source rock in the study region is confirmed by Ariki-1 well, where the Waipawa Formation is represented by a 12 m thick organic-rich marine shale located at depth of 4122-4134 m with total organic carbon (TOC) averaging 3.6 wt% [40].…”
Section: Figurementioning
confidence: 67%
“…A maximum TOC value of 11.5 wt% was derived for the samples from Ariki-1 well [41]. The Waipawa Formation is mainly characterized by terrigenous organic matter [39,42] but HI values are partly above 400 mg/g TOC falling into the field of type II and type II/III source rock. This is consistent with general marine nature of the Waipawa Formation, but with a major contribution of terrestrial -derived woody material [39].…”
Section: Figurementioning
confidence: 99%
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“…Of these units, the late Paleocene Waipawa Formation is richest in TOC and is considered to be a source for oil and gas seeps onshore (Hollis et al, ; Rogers et al, ). However, despite a relatively high TOC content, the petroleum generation potential of the Waipawa Formation is relatively poor where sampled in outcrop (Naeher et al, ). The source rock potential of Paleocene and Cretaceous rocks incorporated deeper into the accretionary wedge or in the subducting plate is not known.…”
Section: Methodsmentioning
confidence: 99%
“…Thermogenic gas generation was modeled as a time dependent process using the Arrhenius equation and applying a conventional petroleum generation kinetic model. Analysis of equivalent rocks from modeled source rock intervals suggests that they are marine sediments, but contain significant or dominant proportions of terrestrially derived (type III) organic matter (Naeher et al, ). In PetroMod™ we therefore use an analogue type III kinetic model based on data from the North Sea (Ungerer, ).…”
Section: Methodsmentioning
confidence: 99%