Carbonates, Fractures
Steven Ogilvie
Chicken-wire fractures

Chicken-wire fractures are common in anhydrite and chalk. This blog looks at some of their key features and provides examples from rock core.

Chicken-wire fractures
Faults, slickenlines
Steven Ogilvie
Slickenlines & Shear Fractures

This blog shows that slickenlines are scratches on the surfaces of shear fractures. The state of stress on a shear fracture can be predicted by Mohr circles.

Slickenlines & Shear Fractures
Fractures, Geothermal
Steven Ogilvie
Wettability & Recovery in Fractured Chalks

This blog addresses why wettability is important in the recovery of oil from fractured chalks.

Wettability & Recovery in Fractured Chalks
Steven Ogilvie
Natural Fracture Types in Fractured Reservoirs

There are 2 basic types of natural fractures that need to be studied when characterising naturally fractured reservoirs - whether it be a geothermal or hydrocarbon reservoir. These are extension and shear fractures.

Natural Fracture Types in Fractured Reservoirs
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

Mudstone

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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.