Borehole Receivers

BGK 3/ 7: Borehole Geophone

Two types of single station, analogue compass equipped borehole geophones are available. The BGK3 consists of 2 horizontal receiver elements and a vertical sensor, while the BGK7 contains 6 horizontal sensors (30 degree angle) and one vertical sensor. The BGKs come with OMNI 2400 geophone elements, but other geophone elements (e.g. SM6, GS14, SM11) or accelerometers can be installed on request.

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BGK 5: Borehole Geophone

The BGK5 borehole geophone contains 4 horizontal (45 degrees separation) and a vertical receiver. The connection to the seismograph is realized by a banana plug patch panel for straightforward channel assignment. The pneumatic clamping system provides excellent coupling to the borehole wall. In order to maintain a low price for projects with limited budget the geophone comes without compass and a reduced number of accessories.

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BGK 1000: Digital Borehole Geophone

The BGK1000 is a geophone for up to 1000 m deep boreholes. It runs on a standard 4-conductor logging cable with an outer steel armor shield. Its Gearhart Owen cable head makes it compatible to various winch suppliers. The downhole probe is equipped with a triaxial geophone and a magnetic compass.

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MBAS: Multistation Borehole Acquisition System

The MBAS is designed for efficient recording of S-waves in boreholes at different levels. A seismograph is not requied since digitalization is placed downhole in the triaxial geophone stations. Pneumatic cylinders ensure a firm mechanical coulpling to the borehole walls. MBAS is a modular system. Starting with a single station new stations can be added. The target application for MBAS is S-wave tomography.

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BHC4: Hydrophone String

The recently indroduced hydrophone string of Type 4 is assembled from 24 active hydrophones moulded on a towing cable. All channels are pre-amplified by factor 8. The supply voltage is provided by a lightweight power supply box (6 volt) placed at the surface.

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DDS: Dual Downhole System

The Dual Downhole System (DDS) consists of two 3C borehole receiver which are placed at 2m distance to each other in one borehole. Each borehole receiver contains x,y,z directed geophones. The lowest receiver does have an in-built magnetic compass for orientation. Receivers are inflated by air and coupled to the borehole wall.

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