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The global energy sector from a subsurface perspective

Geology

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…

Don’t forget to look deeper

Molly Turko and Alex Biholar - Devon Energy
As oil and gas geoscientists, we often focus on the reservoir we are targeting. Seldom do we consider what might be happening deeper, especially in basement rocks. However, what happens…

Not as straight as we sometimes think

Henk Kombrink
Of course, field observations have long shown that faults are not the perfectly straight lines we often see in schematic cross-sections. However, subsurface data do not always allow the detailed…

Who’s Andy? And what did he know about faults?

Molly Turko - Devon Energy
Anderson’s theory classified faults based on the orientation and magnitude of the principle stresses. The magnitudes are defined by S1 (maximum stress), S2 (intermediate stress) and S3 (minimum stress). The…