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Carbon capture and storage (CCS) by geological sequestration comprises a permeable formation (reservoir) for CO₂ storage topped by an impermeable formation (caprock). Time-lapse (4D) seismic is used to map CO₂ movement in the subsurface: CO₂ migration into the caprock might change its properties and...

The Faroe Islands north of Scotland has a disproportionally large number of road tunnels. In addition to 44 km of existing tunnels, two further undersea tunnels totalling 22 km will be completed by 2023. A further 30 km undersea crossing is planned, providing nearly 2 m of tunnel for each of the...

Rock anchors, which can withstand substantial forces and are essential for securing the foundations of the built environment, can fail due to steel tensile failure, bond detachment, or rock mass fracturing through uplift. In this study, uplift failure of the rock mass surrounding rock anchors was...

With the increasing concern of greenhouse gases emitted from oil and gas wells, wellbore leakage has been a topic of interest lately. Previous research has shown that the annular cement used to complete the well and is a primary barrier of fluid migration can experience debonding to the casing...

Subsea tunnels are located deeply under sea. Therefore，they are more difficult in geological investigation，design，construction and operation than land tunnels. In the last 30 years rich experiences have been gained in Norway from constructing 40 subsea tunnels and the“Norwegian subsea tunnelling...