Geology & Geophysics Archives - Page 7 of 13

Geology & Geophysics

Is it possible to differentiate between meandering and braided river deposits using gamma-ray logs?

May 5, 2023

For most people working in subsurface teams, discussions related to the interpretation of depositional facies on the basis of well logs are part of the daily routine. The more geologists…

Well logs and facies interpretation – Who gets it right?

Henk Kombrink

April 12, 2023

For most people working in subsurface teams, discussions related to the interpretation of depositional facies on the basis of well logs are part of the daily routine. The more geologists…

Sequences, sea-level curves and predictive power: Assuming simplicity does not correctly predict complexity

Peter Burgess - School of Environmental Science, University of Liverpool

April 2, 2023

Pre-drill predictions of basin-fill strata, in the absence of substantial supporting data, have been a key objective of seismic and sequence stratigraphic methods including global sea-level curves since the original…

More wells should be drilled with water-based mud

Henk Kombrink

March 17, 2023

“All cuttings brought to surface need to be shipped ashore when they are contaminated with oil-based mud (OBM)”, says Anita Hansen in a recent conversation. Anita has decades’ worth of…

Challenging ground conditions for Norwegian offshore wind

Ronny Setså

March 16, 2023

“The ocean bottom conditions on the Norwegian continental shelf are challenging and vary from place to place, so they must be examined in detail”, says Lars Jensen, geophysicist at the…

Eocambrian outcrops and hydrocarbons in Southern Oman

Stuart Harker

March 15, 2023

The author took part in a 10-day industry field trip to study the Huqf and younger exposures in 2011, from which many outcrop photos are used to illustrate this article.…

A new global sea-level curve

Douwe van der Meer and Kent Wilkinson, CNOOC

March 13, 2023

Traditional long-term eustatic sea-level reconstructions suffer from uncertainty in stratigraphic interpretations of the rock record, which leads to ambiguity. Sea-level reconstructions from plate tectonic modelling are limited in use due…

Cutting data – please handle with care!

Henk Kombrink

February 22, 2023

“It’s not precise at all, so please handle with care”, is one of the first things Anita Hansen tells me when we meet on Teams. We spoke about working with…

Islands by night or…

Henk Kombrink

February 2, 2023

In an article we recently published, Olav Walderhaug from Equinor shared his thoughts on the possible presence of a deeply buried gas source rock in the North Sea. The line…

Recognising Key Stratigraphic Markers During Drilling – The Balder Tuff

Henk Kombrink

February 1, 2023

The Eocene Balder Tuff is an important and widespread stratigraphic marker in the North Sea. For most wells drilled in the area, it sits in the overburden, far away from…

An Exposed Salt Dome

Stuart Harker

January 26, 2023

The salt exposed here consists of halites of the Ara Salt, which was deposited around 540 million years ago during the earliest Cambrian. The core of the dome, where the…

The Best of Brae

Henk Kombrink

January 13, 2023

In Late Jurassic times, an overall north-south trending graben system transected the North Sea as a response to tensional stresses building up in the wider area. The grabens were connected…

The global energy sector from a subsurface perspective