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

Fractures

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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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Natural Fractures in Mudstone

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Natural Fractures in Mudstone

Pink (Devonian age) mudstones on the bank of the River Tay (Perthshire, UK) are intensively fractured - including joints and larger through going fractures Here we look at some of their characteristics including some splaying geometries.

Identifying Fracture Swarms

Identifying Fracture Swarms

Fracture swarms are concentrated zones of open fractures, over which there is little or no offset. Although there are excellent outcrop examples, these structures can be difficult to identify in the subsurface. An integrated static-dynamic approach is best to successfully identify fracture swarms.