Automatic interpretation of geophysical well logs
Correspondence: andres.alcolea@hydrogeomodels.ch
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Published:January 01, 2019
Abstract
Stratigraphic sequences in boreholes are commonly estimated by interpreting combinations of well logs. The interpretation is generally tedious and is made some time after log completion, which often leads to a loss of valuable first-hand information gathered on-site. This may lead to delayed or potentially poor on-site decisions. To make things worse, the standard interpretation of well logs is, at least to a certain degree, subjective and based on the manipulation of data, which may be difficult to trace in the long term. Small changes in lithology are often disregarded and alternating thin layers presenting different lithologies are often...
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Contents
Multiple Roles of Clays in Radioactive Waste Confinement
CONTAINS OPEN ACCESS

This Special Publication highlights the importance of clays and clayey material, and their multiple roles, in many national geological disposal facilities for higher activity radioactive wastes. Clays can be both the disposal facility host rock and part of its intrinsic engineered barriers, and may be present in the surrounding geological environment. Clays possess various characteristics that make them high-quality barriers to the migration of radionuclides and chemical contaminants, e.g. very little water movement, diffusive transport, retention capacity, self-sealing capacity, stability over millions of years, homogeneity and lateral continuity.
The 20 papers presented in this Special Publication cover a range of topics related to clays in radioactive waste confinement. Aspects of clay characterization and behaviour at various temporal and spatial scales relevant to the confinement of radionuclides in clay are discussed, from phenomenological processes to the overall understanding of the performance and safety of geological disposal facilities.
GeoRef
- accuracy
- applications
- boreholes
- calibration
- Central Europe
- decision-making
- equations
- Europe
- geophysical surveys
- interpretation
- mapping
- measurement
- models
- one-dimensional models
- optimization
- reconstruction
- sequence stratigraphy
- statistical analysis
- surveys
- Switzerland
- thickness
- two-dimensional models
- variance analysis
- variograms
- well logs
- northern Switzerland
- Mont Terri Rock Laboratory