True particle velocity wavefield processing in fiber optics - particle motion sensor hybrid array
AssigneeSchlumberger Technology Corporation
InventorsTakashi Mizuno, Joel Herve Le Calvez
Life of this patent
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Abstract
Systems and methods may be used to reconstruct particle velocity wavefields from coupling-calibrated fiber-optic data that subsequently enables physically valid construction of the particle velocity wavefields for a hybrid sensor array including both fiber-optic and particle motion sensors. These systems and methods may be used in a variety of borehole geophysical applications, such as structure and reservoir imaging, impedance inversion, attenuation tomography, micro-seismic fracture imaging, focal mechanism analysis, and so on. The systems and methods may also be used in other applications such as geothermal and CO2 storage monitoring.
Claims16
A system, comprising:
- a hybrid sensor array configured to be deployed in a borehole environment, wherein the hybrid sensor array comprises a plurality of fiber-optic sensors and a plurality of particle motion sensors, wherein the plurality of fiber-optic sensors is configured to measure strain fields in response to a seismic wavefield traveling along the hybrid sensor array, wherein the plurality of particle motion sensors is configured to measure particle motions in response to the seismic wavefield, and wherein the seismic wavefield is produced by a seismic source;
- and
- a control system comprising an interrogator, a seismic recorder, a memory, and one or more processors, wherein the interrogator comprises a light source and a light recorder, wherein the light source is configured to provide source light signals for the plurality of fiber-optic sensors, wherein the light recorder is configured to receive light signals associated with measured strain fields from the plurality of fiber-optic sensors and convert the light signals into fiber sensor data, wherein the seismic recorder is configured to receive and convert the particle motions into particle motion data, and wherein the memory stores instructions that, when executed by the one or more processors, cause the one or more processors to:
- receive the fiber sensor data from the light recorder;
- receive the particle motion data from the seismic recorder;
- estimate calibrated strain data based on the fiber sensor data and the particle motion data;
- estimate first particle velocity data based on the calibrated strain data;
- merge the first particle velocity data and the particle motion data into second particle velocity data;
- process the second particle velocity data as single-component particle motion data;
- and
- output the second particle velocity data as the single-component particle motion data.
A system, comprising:
- one or more processors located in a control system configured to control operations of a hybrid sensor array, wherein the hybrid sensor array comprises a plurality of fiber-optic sensors and a plurality of particle motion sensors, wherein the hybrid sensor array is configured to be deployed in a borehole environment;
- and
- memory storing instructions that, when executed by the one or more processors, cause the one or more processors to:
- receive fiber sensor data acquired by the plurality of fiber-optic sensors;
- receive particle motion data acquired by the plurality of particle motion sensors;
- estimate calibrated strain data based on the fiber sensor data and the particle motion data;
- estimate first particle velocity data based on the calibrated strain data;
- merge the first particle velocity data and the particle motion data into second particle velocity data;
- process the second particle velocity data as single-component particle motion data;
- and
- output the second particle velocity data as the single-component particle motion data.
Dependencies are inferred from the claim text.