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The global energy sector from a subsurface perspective

Geology & Geophysics

A geomechanics approach for natural fracture prediction

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

Permeability multipliers: allies or foes?

Raffik Lazar - GeomodL International
3D reservoir modelling is built on 2 pillars: the static and dynamic reservoir models. The static model quantifies the architecture of the reservoir and the volume in place at initial…

Geomodelling for CCS, a bridge too far?

Raffik Lazar, Geomodl International
Traditionally, geomodels are built in a simplistic fashion, taking into account the inherent degree of uncertainty in the input data. Attempting to accurately depict an unseen geological object, often multiple…

Bouma and Tybalt

Marcos Asensio
The Bouma sequence, proposed by Arnold Bouma, has been a cornerstone in the interpretation of turbidites and high-density sediment currents since its publication in 1962. The Bouma sequence is a…

Can a seal fail?

David Rajmon
A seal is a rock that has a higher capillary entry pressure relative to other adjacent rocks. The higher the contrast, the greater the hydrocarbon column it can hold. The…