Middle to late Pleistocene palaeoceanography inferred from ridge-furrow structures on the continental slope offshore Angola

Putuhena, H. S.; Newton, Andrew; Cartwright, Joe; Huuse, Mads

doi:10.1016/j.margeo.2021.106562

Cited by 3 publications

(1 citation statement)

References 104 publications

(213 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The BWT fluctuations, both the magnitude and time scale for which they occur, provide another element of uncertainty. It must be noted that the strong Benguela current flows along the Namibian margin in this area (Putuhena et al, 2021), and it is difficult to directly factor in the impact that ocean current fluctuations may have on the modeling. The data used to generate a model of the hydrothermal gradient in the area used NOAA data that have been averaged annually over an 8-yr period, but glacialinterglacial BWT changes are poorly known and thus difficult to factor in.…”

Section: Uncertaintymentioning

confidence: 99%

Subsurface temperature from seismic reflections: Application to the post-breakup sequence offshore Namibia

Sarkar¹,

Huuse²

2023

Bulletin

View full text Add to dashboard Cite

Accurate estimations of present-day subsurface temperatures are of critical importance to the energy industry, in particular with regard to geothermal energy and petroleum exploration. In frontier basins, the subsurface temperature regime can give an indication of the hydrocarbon potential of source horizons. The L€ uderitz Basin, offshore Namibia, is a frontier deep-water basin located on a volcanic passive margin. With only two wells drilled in the area, there are limited downhole temperature data available with which to constrain the hydrocarbon window of key source rock intervals. However, high-quality seismic data are available and, by applying the reflection seismic thermometry (RST) process, provide a remote sensing alternative to direct temperature measurements at high spatial resolution. Using seismic reflection and velocity data, first, the identification of a gas hydrate bottom-simulating reflector is used to derive a shallow heat flow proxy (averaging 64 mW m À2 ). Deriving subsurface thermal conductivity from velocity data using an empirical relationship, a prediction for subsurface temperature can be made through forward modeling. Results indicate that average temperatures at the base of the Aptian Kudu Shale interval are 134 C, placing the source in the gas-generative window within the study area. This case study demonstrates the power of RST to generate indicative subsurface temperature results in frontier exploration basins, thereby reducing uncertainty over source rock maturity prior to drilling.

show abstract

Section: Uncertaintymentioning

confidence: 99%

Subsurface temperature from seismic reflections: Application to the post-breakup sequence offshore Namibia

Sarkar¹,

Huuse²

2023

Bulletin

View full text Add to dashboard Cite

show abstract

Introduction: Special issue on bottom currents and contourites: Processes, products and impact

Nicholson,

Stow,

Brackenridge

et al. 2024

Marine Geology

View full text Add to dashboard Cite

Seismic geomorphology: subsurface analyses, data integration and palaeoenvironment reconstructions – an introduction

Newton,

Andresen,

Blacker

et al. 2024

View full text Add to dashboard Cite

Since the last Special Publication on Seismic Geomorphology, the application of seismic data has grown substantially, revolutionising our understanding of basin evolution in the process. The papers presented here provide an insight into the direction of travel for seismic geomorphological analyses and how the science has evolved since 2007. New methods of data collection, new methods of processing and visualisation, and the integration of new types of complementary data, all have played a role in maximising the potential palaeo-environmental insights that can be derived from such studies. The submissions range across different geological settings, consisting of glacial, fluvial, volcanic, deltaic, and slope settings. Many of these studies integrate different methods, showing what can be achieved by combining multiple datasets to understand the subsurface. As more legacy datasets become available, the observed acceleration in seismic data availability and the associated publications will likely continue. Newer methods and the greater understanding of the subsurface are yielding a greater understanding on not just the palaeo-environments, but also what generates seismic reflectivity in the subsurface. The study of seismic geomorphology remains in its infancy, and much exciting research potential is yet to be realised.

show abstract

Middle to late Pleistocene palaeoceanography inferred from ridge-furrow structures on the continental slope offshore Angola

Cited by 3 publications

References 104 publications

Subsurface temperature from seismic reflections: Application to the post-breakup sequence offshore Namibia

Subsurface temperature from seismic reflections: Application to the post-breakup sequence offshore Namibia

Introduction: Special issue on bottom currents and contourites: Processes, products and impact

Seismic geomorphology: subsurface analyses, data integration and palaeoenvironment reconstructions – an introduction

Contact Info

Product

Resources

About