US 2026/0259340 A1Published application

Monitoring system for underground carbon dioxide storage using permanent subsea acoustic source and subsea optical cable

AssigneeKorea Institute of Geoscience and Mineral Resources

InventorsByoungjoon YOON, Kwon Gyu PARK, Snons CHEONG, Yong Chan PARK, Chang Hyun LEE

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Abstract

The present disclosure relates to a carbon dioxide monitoring system using a subsea optical cable. The system includes an optical cable laid on a seafloor of a carbon dioxide storage site, a fixed continuous seismic source configured to generate a sweep signal by applying continuous vibration at a fixed position, and a seismic receiver installed near the seismic source to directly receive the sweep signal. An interrogator irradiates the optical cable with laser light and receives backscattered-light signals from points along the optical cable to implement distributed acoustic sensing. A signal conversion unit converts the backscattered-light signals into impulse-response converted signals through sweep deconvolution. Thus, although exploration is performed using a continuous seismic source, signal processing enables acquisition of data equivalent to that obtained using an impulse-type seismic source. The system enables monitoring of reservoir conditions associated with carbon dioxide injection.

Claims10

Dependent claims

An underground carbon dioxide monitoring system using a subsea optical cable, comprising:

an optical cable laid on a seafloor of a carbon dioxide subsea storage site;
a fixed continuous seismic source configured to apply continuous vibration for a predetermined period of time at a fixed position in the subsea storage site to generate a sweep signal;
a seismic receiver installed close to the fixed continuous seismic source and configured to directly receive the sweep signal that is not reflected by a stratum;
an interrogator including a light source configured to irradiate the optical cable with laser light, a photodetector configured to receive a backscattered-light signal that is returned from each point of the optical cable by the laser light emitted from the light source, and a signal processing unit configured to process the backscattered light;
and
a signal conversion unit configured to convert the backscattered-light signal received from the interrogator into an impulse-response converted signal to be received by an impulse-type seismic source and the seismic receiver.

3 more elements

Dependencies are inferred from the claim text.