Geology & Geophysics Archives - Page 7 of 17

Geology & Geophysics

The geological record of a highly eruptive part of North Sea history

Max Casson and Geir Helgesen, Equinor

August 6, 2024

The Kveikje discovery in the Norwegian North Sea was proven with a play-opening well in 2022, discovering a significant hydrocarbon accumulation in shallow Eocene-aged remobilised sands and injectites. These strata…

Riedel shears as kinematic indicators

Molly Turko - Devon Energy

July 30, 2024

In the previous article in this series, we discussed that Riedel shears are commonly the first set of subsidiary faults we see prior to the breakthrough of a master fault.…

The rise of production geology

Raffik Lazar, GeomodL International

July 19, 2024

Before anything, let’s clear the water: Production geology is not a cross-over between the cinema industry and our good ol’ geology. Production geology refers to unravelling the geological intricacies in…

Using seismic velocity to derisk oil exploration

Martin Essenfeld and Rafael Sandrea

July 15, 2024

In a recent GEO EXPRO article, we developed a field-based approach to identify natural gas prospects directly from seismic surveys. The gas fields are straight up. If the p-wave velocities…

How careful core description and detailed biostratigraphic analysis can delineate sub-seismic reservoir zones in a highly mud-prone system

John Cater, Petrostrat

July 10, 2024

This study was undertaken by PetroStrat in collaboration with Stratum AS (QEMSCAN), Barnwell Parker Geoscience Limited (seismic interpretation) and HM Research Associates (heavy mineral provenance analysis). Together, we have completed…

Shallow clastic targets and electro-magnetic surveys – a good match

Henk Kombrink

June 21, 2024

“The most interesting test for our technology is the upcoming drilling campaign near the Wisting discovery in the Barents Sea”, said Martin Hansen, Daniel Baltar and Friedrich Roth from EMGS…

The forgotten value of (seismic) tapes

Henk Kombrink

June 14, 2024

“I’m probably the only tape machine specialist left in northwest Europe”, says Egil Simones from ET Works when we meet at the EAGE Conference in Oslo this week. Egil is…

Heat flow as a basin model calibration? Not really

David Rajmon

June 14, 2024

Many exploration geologists who work in data-lean basins or who do not have access to well data turn to published heat flow data as a calibration for basin models. More…

A geomechanics approach for natural fracture prediction

Steven Ogilvie, Ogilvie Geoscience, and Paolo Pace, Pace Geoscience

June 7, 2024

Natural fractures can provide the essential permeability in hydrocarbon and geothermal reservoirs. However, they exist in the sub-seismic domain and although they can be detected by well logs and cores,…

How to explain these rates?

Marcos Asensio

May 22, 2024

The Jurassic Vaca Muerta unit is a treasure trove with an estimated potential of 308 TCF of gas and 16.2 billion barrels of oil. While there are various types of…

Riedel shears, my favorite kinematic indicator

Molly Turko - Devon Energy

May 19, 2024

Riedel shears are commonly the first set of subsidiary faults we see prior to the breakthrough of a master fault. They form systematically at an acute angle (~10-20°) to the…

Should you rely on geothermal gradients?

David Rajmon

May 7, 2024

When I start a new project, I commonly get this question: “What is the geothermal gradient in this area?” The question stems from an underlying assumption that the gradient provides…

The global energy sector from a subsurface perspective