Faults, Folds
Steven Ogilvie
Thrust systems at different scales

This blog examines some key features of thrust systems with an example from seismic data offshore Namibia and from a hand specimen onshore UK.

Thrust systems at different scales
Fractures, joints
Steven Ogilvie
Deformation band contained Joints

This blog looks at joints contained within zones of deformation bands - how they form and if they are important or not.

Deformation band contained Joints
Fractures
Steven Ogilvie
Geomechanics approach to fracture prediction

This blog describes the value of a geomechanical approach to fracture prediction; for example thin beds often have more fractures than thick beds.

Geomechanics approach to fracture prediction
Deformation Bands, Faults
Steven Ogilvie
Deformation Bands in Permian Sandstones, ...

This blog looks at some key features of zones of deformation bands. Featured are 2 outcrops of Permian age sandstone from Scotland, UK.

Deformation Bands in Permian Sandstones, Scotland, UK.
Stylolites
Steven Ogilvie
Stylolites in Sandstones

This blog focuses upon stylolites which are structures that either form during burial or by later tectonic movements and have a serrated appearance on rock surfaces.

Stylolites in Sandstones

Deformation Bands

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Deformation bands & later open fractures, Clair Field

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Deformation bands & later open fractures, Clair Field

Deformation bands (permeability reducing) and open fractures (enhancing) can co-exist in a sandstone reservoir but owing to timing (the d-bands form early during burial), the open fractures can still assist or provide essential reservoir permeability.

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Cemented fractures: good or bad news ?

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Cemented fractures: good or bad news ?

Cemented fractures are often bad news for hydrocarbon production but a partially filled fracture network can be benefical..

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Deformation Bands, Permian Ssts, Norway

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Deformation Bands, Permian Ssts, Norway

Deformation Bands can drastically impact the permeability of otherwise good quality reservoir sandstones. This example is from Permian Sandstones, N of Oslo in Norway. Here we look at some of it's key structures. 

Any info on the structure/d - bands of this outcrop would be appreciated. 

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Deformation Bands in High Porosity Sandstones

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Deformation Bands in High Porosity Sandstones

Deformation Bands are fault like structures that drastically reduce the porosity and permeability of sandstones.

Here we focus upon cataclastic (grain size reduction) deformation bands, their impact upon hydrocarbon production and exploration and some ways to predict them.