Seismic Geomorphology of Paleokarst Systems in Paleozoic Carbonates, Norwegian Barents Sea

Hunt, David; Colpaert, Arnout; Miquelis, Florian; Graham-Wall, Brita; Pajchel, Jan; Lukasik, Jeffery; Rafaelsen, B.; Avu, Anthony; Patton, Gaynor

doi:10.5724/gcs.10.30.0184

Cited by 3 publications

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“…9), corresponding to the Alagoas unconformity, confirm the occurrence of open and enlarged fractures as well as vuggy zones. Hunt et al (2010) described the occurrence of paleokarst features occurring as discontinuous amplitude anomalies arranged in separate subparallel reflection zones (Table 2), with a depth sag effect due to the collapse of the surrounding damaged rocks as seen in Fig. 14.…”

Section: Discussionmentioning

confidence: 99%

Paleokarst features in the Aptian carbonates of the Barra Velha Formation, Santos Basin, Brazil

Nworie,

Chinelatto,

Vidal

2023

Braz. J. Geol.

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Seismic data, borehole image logs, and conventional well logs were used to investigate the distribution and characteristics of paleokarst features in the Aptian carbonates of the Barra Velha Formation in a pilot area of the Santos Basin, Brazil. Multiple seismic attributes were used to enhance details on the seismic data and highlight key seismic parameters including strata deformation and geometry, continuity of seismic events, and fault patterns. The study found that karst structures are controlled by faults and fractures along structural highs, which served as a conduit for the flow of dynamic fluids that dissolved the carbonate materials. Several closed, circular depressions and bright spots identified in the northeastern portion of the study area represent possible sinkhole structures. Epigenic and hypogenic processes due to the action of meteoric water, hydrothermal activity, and intra-formation acidity along regional unconformities in the Barremian-Aptian may have been responsible for the dissolution. Limitations of this study are related to the difficulty of integrating multiple datasets with various scales. However, the higher confidence for the occurrence of the karst features is provided by borehole images at the sub-seismic scale. The findings of this study hold significant relevance for the strategic planning of energy development and carbon sequestration initiatives in the Brazilian continental margins, thereby aiding in informed decision-making.

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Section: Discussionmentioning

confidence: 99%

Paleokarst features in the Aptian carbonates of the Barra Velha Formation, Santos Basin, Brazil

Nworie,

Chinelatto,

Vidal

2023

Braz. J. Geol.

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Upper Carboniferous–Lower Permian Palaeoaplysina build-ups on Svalbard: the influence of climate, salinity and sea-level

Hanken

Nielsen

2013

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Upper Carboniferous–Lower Permian Palaeoaplysina build-ups on Svalbard developed on a partly restricted marine warm-water carbonate platform at low palaeo-latitudes. The Palaeoaplysina build-ups mostly have a flat-topped tabular geometry, representing the mature stage of build-up growth. With decreasing accommodation space, continued vertical growth was hampered and lateral growth became dominant. The tabular growth form of the build-ups is probably a result of lateral amalgamation of several minor mounds. In central Spitsbergen many of the tabular build-ups form parts of continuous ridges or ring-shaped to polygonal build-up complexes encircling a lagoon. Lateral interfingering between bedded fusulinid dolostones along the build-up margins and barren dolostones further out in the lagoon may indicate increasing salinity from the lagoon margin to the central part. These lateral facies changes are often associated with evaporites (gypsum) and low biodiversity, especially abundant euryhaline fusulinids or even barren beds. On the sea side of the Palaeoaplysina build-ups, the frequent renewal of normal saline seawater allowed the highest biodiversity (e.g. stenohaline crinoids). The uppermost part of some build-ups contain Microcodium, indicating intermittent subaerial exposure and vegetation cover during lowstand, probably caused by eustatic sea-level changes and/or local tectonics. The biota of the build-ups and their lateral sediments is typical for a shallow marine chloroforam association, indicating a tropical climate during deposition.

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Seismic characterization of carbonate platforms and reservoirs: an introduction and review

Hendry

Burgess

Hunt

et al. 2021

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Improved seismic data quality in the last 10–15 years, innovative use of seismic attribute combinations, extraction of geomorphological data, and new quantitative techniques, have significantly enhanced understanding of ancient carbonate platforms and processes. 3D data have become a fundamental toolkit for mapping carbonate depositional and diagenetic facies and associated flow units and barriers, giving a unique perspective how their relationships changed through time in response to tectonic, oceanographic and climatic forcing. Sophisticated predictions of lithology and porosity are being made from seismic data in reservoirs with good borehole log and core calibration for detailed integration with structural, paleoenvironmental and sequence stratigraphic interpretations. Geologists can now characterise entire carbonate platform systems and their large-scale evolution in time and space, including systems with few outcrop analogues such as the Lower Cretaceous Central Atlantic “Pre-Salt” carbonates. The papers introduced in this review illustrate opportunities, workflows, and potential pitfalls of modern carbonate seismic interpretation. They demonstrate advances in knowledge of carbonate systems achieved when geologists and geophysicists collaborate and innovate to maximise the value of seismic data from acquisition, through processing to interpretation. Future trends and developments, including machine learning and the significance of the energy transition, are briefly discussed.

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Seismic Geomorphology of Paleokarst Systems in Paleozoic Carbonates, Norwegian Barents Sea

Cited by 3 publications

References 0 publications

Paleokarst features in the Aptian carbonates of the Barra Velha Formation, Santos Basin, Brazil

Paleokarst features in the Aptian carbonates of the Barra Velha Formation, Santos Basin, Brazil

Upper Carboniferous–Lower Permian Palaeoaplysina build-ups on Svalbard: the influence of climate, salinity and sea-level

Seismic characterization of carbonate platforms and reservoirs: an introduction and review

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