Sensor apparatus and method

Inactive Publication Date: 2012-09-18
CONCEPT SYST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0039]Typically, the method further comprises the step of using orthogonally disposed magnetic sensors to determine the orientation of the seismic sensor apparatus relative to North. More prefe

Problems solved by technology

The quality of results provided by such a mechanically gimballed sensor is limited by the fact that vibrations act on each geophone via the coupling arm of the gimbals.
The sensor cannot differentiate between actual seismic vibrations, and those caused by

Method used

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Examples

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Example

[0068]The seismic data, collected by the accelerometers of the first embodiment or the geophones of the second embodiment, is input into data processing software 44 and analyzed to measure the seismic vibrations in the terrain 46.

[0069]Either embodiment of the sensor may incorporate orthogonally disposed magnetic sensors 48. These sensors collect information which is input into data processing software 50 and analyzed to determine the orientation of the seismic sensor apparatus relative to North 52. If the sensor does not include magnetic sensors, alternative means must be used to determine the orientation of the seismic sensor apparatus relative to North 54.

[0070]In each embodiment of the sensor, the data received is transferred to a central location for analysis.

[0071]These and other modifications and improvements can be incorporated without departing from the scope of the invention.

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Abstract

A multi component seismic sensor which utilises orthogonal accelerometers to determine its orientation. The accelerometers may be used to measure seismic signals directly, or the system may include geophones for this purpose.

Description

BACKGROUND OF THE INVENTION[0001]This invention relates to a sensor apparatus and method and in particular to a sensor apparatus and method for use in seismic surveys.[0002]To conduct a geophysical survey of an underwater area in oil exploration or prospecting, it is known to use a multi-component sensor in conjunction with returning echoes produced by a seismic source. Such a sensor comprises an orthogonal array of three geophones. The seismic source is normally impulsive, produced by explosives or airguns; or continuous, produced by vibrator trucks. The source produces sudden pulses of short duration which are reflected and detected by the geophones.[0003]In practice, a number of sensors are inserted in a cable arrangement. In Ocean Bottom Cable or in shallow water operations this cable is fed from a seagoing vessel and allowed to settle on the seabed.[0004]Each geophone is an electromechanical device sensitive to vibrations along its axis. The signals from each geophone are ampli...

Claims

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Application Information

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IPC IPC(8): G01V1/38G01V1/16
CPCG01V1/16
Inventor STEPHEN, GORDON
Owner CONCEPT SYST
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