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Sensor apparatus and method

Inactive Publication Date: 2012-09-18
CONCEPT SYST
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  • Summary
  • 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 this cross-coupling.
This conventional apparatus and technique is costly, which restricts its use.
In addition, vibration acting on each geophone via the coupling arm of the gimbals, and cross-coupling through the gimbals, give a high probability of error.

Method used

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Embodiment Construction

[0047]Referring to the figures, a seismic survey across a “prospect” or terrain of interest is conducted by positioning a number of sensor units 1 at known locations, typically in a regular array.

[0048]One possible application is in ocean bottom cable (OBC) systems and shallow water operations for 3D and 4D seismic acquisition. FIG. 1 shows the sensor units 1 in use in an OBC operation in which sensor units 1 are lowered by cable 2 from a recording vessel 3 to sit on the seabed 4. In such use it is of course necessary to enclose the sensor units 1 in a watertight casing and to use communication means such as electronic or optical transmission via the suspension cable 2 to collect data. The sensor units 1 are also of use in land based operations.

[0049]FIG. 2a illustrates an individual sensor unit 1 which may be used in the survey of FIG. 1. For simplicity, interconnections and internal electronics of the unit 1 are not shown. This sensor 1 includes three orthogonally disposed acceler...

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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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