New style of honeycomb structures revealed on 3D seismic data indicate widespread diagenesis offshore Great South Basin, New Zealand

Morley, C.K.; Maczak, A.; Rungprom, T.; Ghosh, J.; Cartwright, Joe; Bertoni, Claudia; Panpichityota, N.

doi:10.1016/j.marpetgeo.2017.05.035

Cited by 23 publications

(28 citation statements)

References 41 publications

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“…The Great South Basin is a NE-trending Late Cretaceous rift basin located offshore of the east coast of the South Island of New Zealand. It contains a maximum sedimentary thickness of 8.6 km, which includes up to 4 km of Upper Cretaceous strata (Beggs, 1993;Morley et al, 2017;Sahoo et al, 2014) (Figures 1 and 3). The Great South Basin, along with the adjacent Canterbury Basin and Bounty Trough, is situated within the Campbell Plateau, a submerged (<1000 m water depth) area of thinned continental crust (22-32 km) that extends~1000 km southeast of the South Island ( Figure 1) (Beggs, 1993;Grobys et al, 2009;Higgs et al, 2019;Mortimer et al, 2002;Uruski, 2010).…”

Section: Regional Geological Setting and Evolutionmentioning

confidence: 99%

Terrane Boundary Reactivation, Barriers to Lateral Fault Propagation and Reactivated Fabrics: Rifting Across the Median Batholith Zone, Great South Basin, New Zealand

Phillips

McCaffrey

2019

Tectonics

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Prominent preexisting structural heterogeneities within the lithosphere may localize or partition deformation during tectonic events. The NE‐trending Great South Basin, offshore New Zealand, formed perpendicular to a series of underlying crustal terranes, including the dominantly granitic Median Batholith Zone, which along with the boundaries between individual terranes exert a strong control on rift physiography and kinematics. We find that the crustal‐to‐lithospheric scale southern terrane boundary of the Median Batholith Zone is associated with a crustal‐scale shear zone that was reactivated during Late Cretaceous extension between Zealandia and Australia. This reactivated terrane boundary is oriented at a high angle to the faults defining the Great South Basin. We identify a large granitic laccolith along the southern margin of the Median Batholith, expressed as subhorizontal packages of reflectivity and acoustically transparent areas on seismic reflection data. The presence of this strong granitic body inhibits the lateral southwestward propagation of NE‐trending faults, which segment into a series of splays that rotate to align along the margin as they approach. Further, we also identify two E‐W‐ and NE‐SW‐oriented basement fabrics, likely corresponding to prominent foliations, which are exploited by small‐scale faults across the basin. We show that different mechanisms of structural inheritance are able to operate simultaneously, and somewhat independently, within rift systems at different scales of observation. The presence of structural heterogeneities across all scales needs to be incorporated into our understanding of the structural evolution of complex rift systems.

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Section: Regional Geological Setting and Evolutionmentioning

confidence: 99%

Terrane Boundary Reactivation, Barriers to Lateral Fault Propagation and Reactivated Fabrics: Rifting Across the Median Batholith Zone, Great South Basin, New Zealand

Phillips

McCaffrey

2019

Tectonics

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“…PFSs in the Great South and Canterbury Basins have recently been reported by several studies (e.g. [14][15][16][17]). Morley et al (2017) studied the honeycomb structures associated with the PFS in the GSB [15].…”

Section: Introductionmentioning

confidence: 68%

“…[14][15][16][17]). Morley et al (2017) studied the honeycomb structures associated with the PFS in the GSB [15]. The honeycomb structures are characterised by extensive circular to polygonal depressions.…”

Section: Introductionmentioning

confidence: 99%

“…The honeycomb structures are characterised by extensive circular to polygonal depressions. Morley et al (2017) observed two PFS tiers, which are referred to as Tier 1 (southern area) and Tier 2 (northern area), but they did not focus on details of the PFS characteristics such as fault throw analysis and depositional environment at the PFS interval [15]. Li et al (2020) also studied the characteristics of the PFSs in the GSB using fault enhancement and skeletonization processes [17].…”

Section: Introductionmentioning

confidence: 99%

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Seismic characteristics of polygonal fault systems in the Great South Basin, New Zealand

et al. 2020

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A well-developed multi-tier polygonal fault system is located in the Great South Basin offshore New Zealand’s South Island. The system has been characterised using a high-quality three-dimensional seismic survey tied to available exploration boreholes using regional two-dimensional seismic data. In this study area, two polygonal fault intervals are identified and analysed, Tier 1 and Tier 2. Tier 1 coincides with the Tucker Cove Formation (Late Eocene) with small polygonal faults. Tier 2 is restricted to the Paleocene-to-Late Eocene interval with a great number of large faults. In map view, polygonal fault cells are outlined by a series of conjugate pairs of normal faults. The polygonal faults are demonstrated to be controlled by depositional facies, specifically offshore bathyal deposits characterised by fine-grained clays, marls and muds. Fault throw analysis is used to understand the propagation history of the polygonal faults in this area. Tier 1 and Tier 2 initiate at about Late Eocene and Early Eocene, respectively, based on their maximum fault throws. A set of three-dimensional fault throw images within Tier 2 shows that maximum fault throws of the inner polygonal fault cell occurs at the same age, while the outer polygonal fault cell exhibits maximum fault throws at shallower levels of different ages. The polygonal fault systems are believed to be related to the dewatering of sedimentary formation during the diagenesis process. Interpretation of the polygonal fault in this area is useful in assessing the migration pathway and seal ability of the Eocene mudstone sequence in the Great South Basin.

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“…Diagenetic transformations are reported from sedimentary basins worldwide (e.g., [26][27][28][29][30][31][32][33][34]). The Monterey Formation in California, USA, has been extensively studied with regard to the transformation of opal A to opal CT (e.g., [35][36][37][38][39]), but diagenetic alterations have also been observed several places in wells and on seismic data from the Norwegian Continental Shelf (e.g., [24,[40][41][42][43][44][45][46][47]).…”

Section: Introductionmentioning

confidence: 99%

The Influence of Magmatic Intrusions on Diagenetic Processes and Stress Accumulation

et al. 2019

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Diagenetic changes in sedimentary basins may alter hydrocarbon reservoir quality with respect to porosity and permeability. Basins with magmatic intrusions have specific thermal histories that at time of emplacement and in the aftermath have the ability to enhance diagenetic processes. Through diagenesis the thermal conductivity of rocks may change significantly, and the transformations are able to create hydrocarbon traps. The present numerical study quantified the effect of magmatic intrusions on the transitions of opal A to opal CT to quartz, smectite to illite and quartz diagenesis. We also studied how these chemical alterations and the sills themselves have affected the way the subsurface responds to stresses. The modeling shows that the area in the vicinity of magmatic sills has enhanced porosity loss caused by diagenesis compared to remote areas not intruded. Particularly areas located between clusters of sills are prone to increased diagenetic changes. Furthermore, areas influenced by diagenesis have, due to altered physical properties, increased stress accumulations, which might lead to opening of fractures and activation/reactivation of faults, thus influencing the permeability and possible hydrocarbon migration in the subsurface. This study emphasizes the influence magmatic intrusions may have on the reservoir quality and illustrates how magmatic intrusions and diagenetic changes and their thermal and stress consequences can be included in basin models.

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New style of honeycomb structures revealed on 3D seismic data indicate widespread diagenesis offshore Great South Basin, New Zealand

Cited by 23 publications

References 41 publications

Terrane Boundary Reactivation, Barriers to Lateral Fault Propagation and Reactivated Fabrics: Rifting Across the Median Batholith Zone, Great South Basin, New Zealand

Terrane Boundary Reactivation, Barriers to Lateral Fault Propagation and Reactivated Fabrics: Rifting Across the Median Batholith Zone, Great South Basin, New Zealand

Seismic characteristics of polygonal fault systems in the Great South Basin, New Zealand

The Influence of Magmatic Intrusions on Diagenetic Processes and Stress Accumulation

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