Combining seismic data from sensors to attenuate noise
AssigneeWesternGeco L.L.C.
InventorsPascal Edme, Everhard Muyzert, Julian Edward (Ed) Kragh, Johan O. A. Robertsson, Qinglin Liu
Life of this patent
Estimating the term…
Abstract
To perform noise attenuation for seismic surveying, a sensor assembly is deployed on a ground surface, where the sensor assembly has a seismic sensor to measure seismic waves propagated through a subterranean structure, and a divergence sensor comprising a pressure sensor to measure noise. First data is received from the seismic sensor, and second data is received from the divergence sensor. The first data and the second data are combined to attenuate noise in the first data.
Claims21
A method of noise attenuation for land-based seismic surveying, comprising:
- deploying a sensor assembly at a ground surface, wherein the sensor assembly has a seismic sensor to measure seismic waves reflected from a subterranean structure in response to seismic waves transmitted due to activation of at least one seismic source, and a divergence sensor comprising a pressure sensor to measure ground-roll noise, wherein the divergence sensor includes a container containing a material and the pressure sensor immersed in the material, and the divergence sensor is insensitive to a direction of wave propagation, and wherein the divergence sensor is buried below the ground surface and a portion of the sensor assembly including the divergence sensor is in contact with an earth medium underneath the ground surface;
- receiving first data representing the reflected seismic waves from the seismic sensor and second data representing the ground-roll noise from the divergence sensor, the first data representing measurements along two or more axes, and the second data comprising measurements insensitive to a direction of wave propagation;
- and
- combining the first data and the second data to attenuate ground-roll noise in the first data.
A system comprising:
- a controller having a processor to receive data collected by sensor assemblies deployed at a ground surface, where each of the sensor assemblies has a seismic sensor to measure seismic waves reflected from a subterranean structure, and a divergence sensor comprising a pressure sensor to measure ground-roll noise, wherein the divergence sensor includes a container containing a material and the pressure sensor immersed in the material, and the divergence sensor is insensitive to a direction of wave propagation, and wherein the divergence sensor is buried below the ground surface and a portion of the sensor assembly including the divergence sensor is in contact with an earth medium underneath the ground surface,
- wherein the processor is configured to combine first data representing the reflected seismic waves from the seismic sensors with second data representing the ground-roll noise from the divergence sensors to attenuate ground-roll noise in the first data from the seismic sensors, the first data representing measurements along two or more axes, and the second data comprising measurements insensitive to a direction of wave propagation.
An article comprising at least one non-transitory computer-readable storage medium containing instructions that upon execution cause a system having a processor to:
- receive data collected by sensor assemblies arranged at a ground surface, where each of the sensor assemblies has a seismic sensor to measure seismic waves reflected from a subterranean structure, and a divergence sensor comprising a pressure sensor to measure ground-roll noise, wherein the divergence sensor includes a container containing a material and the pressure sensor immersed in the material, and the divergence sensor is insensitive to a direction of wave propagation, and wherein the divergence sensor is buried below the ground surface and a portion of the sensor assembly including the divergence sensor is in contact with an earth medium underneath the ground surface;
- and
- combine first data representing the reflected seismic waves from the seismic sensors with second data representing the ground-roll noise from the divergence sensors to attenuate ground-roll noise in the first data from the seismic sensors, the first data representing measurements along two or more axes, and the second data comprising measurements insensitive to a direction of wave propagation.
Dependencies are inferred from the claim text.