Doris Wagner

• British Geological Survey

Serpentine minerals serve as an Mg donor in carbon capture and storage by mineralisation (CCSM). The acid-treatment of nine comprehensively-examined serpentine polymorphs and polytypes, and the subsequent microanalysis of their post-test residues highlighted several aspects of great importance to the choice of the optimal feed material for CCSM. Co...

Traditionally, potash mineral deposits have been characterized using downhole geophysical logging in tandem with geochemical analysis of core samples to establish the critical potassium (% K2O) content. These techniques have been employed in a recent exploration study of the Permian evaporite succession of North Yorkshire, United Kingdom, but the c...

Systematic multi-media geochemical surveying by the British Geological Survey's Geochemical Baseline Survey of the Environment (G-BASE) project has revealed significant anomalous patterns of enrichment for a suite of elements - copper (Cu) and uranium (U) - with exceptionally high levels of molybdenum (Mo), in soils and stream sediments in central...

The Jurassic Entrada sandstone at Salt Wash Graben, Utah, USA, a red sandstone contains significant rock bleaching. The cause of the bleaching has been thought to be associated with the modern day CO2-rich fluids in the area which present on the surface by utalising the local fractures, some of which are filled with calcite and iron rich minerals (...

The current UK repository concept for low-and intermediate-level radioactive wastes involves using large quantities of cementitious materials for both construction and buffer/backfill. CO2 generated from degradation of waste organic material results in cement carbonation and associated mineralogical changes. Hydraulic and gas permeability tests wer...

This study investigates the influence of microbes on fluid transport in sedimentary and igneous host rock environments. It particularly focuses on granodiorite rock (Äspö; Sweden) and mudstone (Horonobe; Japan) that were utilised during laboratory-based column experiments. The results showed that biofilms form on both rock types in low nutrient con...

Efficient storage of carbon dioxide (CO2) in deep reservoirs will be dependent on the integrity of the natural seals above the CO2. This experimental study focuses on geochemical reactions between CO2, synthetic porewaters and Utsira caprock the sealing lithology of the Sleipner storage site. It provides data for experiments lasting 5 years, and ex...

General assessments of orebody types and associated mine wastes with regard to their environmental signature and human health hazards are needed to help in managing present and historical mine waste facilities. Bioaccessibility tests and mineralogical analysis were carried out on mine waste from a systematic sampling of mine sites from the Central...

Despite a long history of detailed study, the extensive Jurassic sandstone outcrops of the Colorado Plateau in Southeast Utah, USA continue to provide opportunities to examine reservoir-scale processes. There are a number of large-scale CO2 accumulations in these reservoirs and locally also natural and man-induced CO2-rich springs and geysers, ofte...

This study focused on the reactions between carbon dioxide (CO2), porewater and host rock during geological CO2 storage in deep reservoirs. The aim of this work was to provide a well-constrained laboratory experiment reacting known quantities of minerals with CO2-rich fluids, to simulate situations where CO2 is being injected into lithologies deep...

Natural analogues of Portland cement can provide insights into carbonation processes operating over timescales of interest to performance assessments of CO2 storage. Two such sites in Northern Ireland (Scawt Hill and Carneal Plug) have been investigated, where carbonation reactions of naturally-occurring cement minerals can be observed. Here, parti...

The significance of the potential impacts of microbial activity on the transport properties of host rocks for geological repositories is an area of active research. Most recent work has focused on granitic environments. This paper describes pilot studies investigating changes in transport properties that are produced by microbial activity in sedime...

Landfill and radioactive waste disposal risk assessments focus on contaminant transport and are principally concerned with understanding the movement of gas, water and solutes through engineered barriers and natural groundwater systems. However, microbiological activity can affect transport processes, changing the chemical and physical characterist...

Landfill and radioactive waste disposal risk assessments focus on contaminant transport and are principally concerned with understanding the movement of gas, water and solutes through engineered barriers and natural groundwater systems. However, microbiological activity can impact on transport processes changing the chemical and physical characteri...