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HIGH RESOLUTION 3-D SEISMIC REFLECTION APPLIED TO SUBSIDENCE EVALUATION AND SOLUTION MINE DESIGN

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The advantages of 3D shallow high resolution seismic reflection methods have been favorable compared against conventional 2D high resolution and 2D MiniSosie seismic data, as well as in the Hengelo solution mine as in the mine of Belvedere Spinello. Successful application in the first mine was followed by a test in Italy and this provided a basis of evaluation of site specific factors for the 3D-HRS method. Subsidence models have been developed after a detailed study of the geology and tectonic history was made of the area under investigation.
Concealed subsurface cavities were accurately delineated and controlled by sonar measurements as far as possible.
An acoustic simulation model was developed to study the behaviour of a brine filled cavity by seismic pick-up. The subsidence models were simulated and proved by numerical experiments using two different computer programs, as the finite difference program FLAC and the finite element program DIANA.
The project objectives are to develop and assess the possibilities of a new technique that shall make possible evaluation of subsidence and improved mine planning of solution mines. Subsidence prediction improves safety and may reduce environmental problems of existing solution mines. The method must allow evaluation of the risk of subsidence in abandoned mine sites and in areas where sinkholes may occur. It is assessed whether the method under investigation is suitable for detection and delineation of underground voids. Certain underground mining and geotechnical applications benefit from the project.

The technical objectives focus on assessment of geotechnical parameters from 3D high resolution seismic data. Research on determination of geotechnical parameters for typical 3D HRS conditions is carried out. 3D HRS is compared with existing 2D conventional and 2D HRS data and to geological data obtained from boreholes. This comparison is performed in order to justify use of this more expensive yet promising technique. The seismic investigation should provide very accurate information on the structural geology and stratigraphy and the geotechnical parameters related to subsidence, since it is used for geotechnical investigations and modelling.

The tasks to be carried out include acquisition, processing and interpretation of 2D and 3D high resolution seismic data at two different test sites. For interpretation and evaluation purposes exploration boreholes are drilled to collect geological data, carry out wireline logging and acquire a velocity depth profile and synthetic seismogram. Sonar surveys in existing cavities are carried out to assess the capabilities for detecting concealed underground brine filled or earth filled voids.

The method is to be verified at two different test sites to determine the applicability in general and assess the importance of site specific factors in the method.

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Finanzierungsplan

CSC - Cost-sharing contracts

Koordinator

AKZO SALT AND BASIC CHEMICALS DIVISION
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Adresse
BOORTORENWEG 20
7550 GC HENGELO (OV)
Niederlande

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Letzte Aktualisierung: 5 April 2023

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Permalink: https://cordis.europa.eu/project/id/BRE20316/de

European Union, 2024