Unique seismic sondes checking out Eden’s Deep Geothermal Project

Posted: Friday 30th September 2011

Unique seismic sondes made by DJB Instruments are being put to work at The Eden Project’s Deep Geothermal Development. The Development being undertaken by EGS Energy Limited involves building one of the UK’s first geothermal power plants, producing heat and generating electricity.

The highly sensitive array of seismic sondes will be deployed to monitor any seismic activity, whether natural or induced, during the opening up of the natural fractures in the rock, which is done by injecting water.

The seismic sondes, designed and built by DJB instruments, comprise unique qualities which make them ideal for this kind of work. They can be deployed to a depth of 400m, they do not need a clamping mechanism and the small diameter gives makes then ideal for deploying small diameter boreholes. Importantly, the large accelerometers and low noise amplifiers give a very high output and make them able to detect very small signals. This gives very high levels of accuracy without any deterioration of signal quality over time.

The seismic sounds are triangulated to find out exactly where and when natural fractures are opening and then slipped by a shear mechanism. This gives detailed information about what is happening at great depth and an image is produced to show the area where the water has migrated. The location of the second borehole that is drilled is chosen according to the image produced by the seismic locations.

The Technical Director of EGS Energy, Roy Baria, said: “These highly sensitive accelerometer based seismic sondes are a product of over 30 years of development with DJB Instruments (UK) Ltd which started at the UK EGS project at the Rosemanowes site in 1980’s and continued at the European site in Soultz in France until recently. They have developed a unique product which is being adopted worldwide and EGS Energy is proud to use them at the proposed EGS site at the Eden Project at St Austell in the UK.”

Paul Hunter, Managing Director DJB Instruments (UK) Ltd, said: “We pride ourselves on delivering innovative products and first class customer service to companies across the globe– and we’re delighted that our products are being put to good use at The Eden Project”.

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