Marine seismic surveying
OwnerJames Martin, Philip Christie +3inventors
InventorsJames Martin, Philip Christie, Johan Fredrik Naes, Nicolas Goujon, Rune Voldsbekk
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Abstract
A method of performing a seismic survey of a hydrocarbon reservoir in the earth formations beneath a body of water includes deploying a seismic cable from a drum carried by a remotely operated vehicle on the seabed. The cable is deployed into a lined trench, which is formed either concurrently with cable deployment or during a previous survey, to ensure good repeatability of successive surveys of the reservoir, in order to enable changes in characteristics of the reservoir, eg due to depletion, to be monitored.
Claims20
A method of performing a seismic survey of earth formations beneath a body of water, the method comprising the steps of:
- (a) forming a trench in the bottom of the body of water;
- (b) lining the trench;
- (c) deploying a seismic cable having a plurality of seismic sensors distributed therealong in the lined trench;
- (d) operating an acoustic source in the body of water to produce seismic signals which enter the formations;
- and
- (e) detecting seismic signals which return from the formations with said sensors.
A method of performing a seismic survey of earth formations beneath a body of water, the method comprising the steps of:
- (a) forming a trench in the bottom of the body of water;
- (b) lining the trench, wherein the trench is lined with a relatively soft, relatively high friction material, the material made in pre-formed sections, thereby forming a lined trench;
- (c) deploying a seismic cable having a plurality of seismic sensors distributed therealong in the lined trench;
- (d) operating an acoustic source in the body of water to produce seismic signals which enter the formations;
- and
- (e) detecting seismic signals which return from the formations with said sensors.
A method of performing a seismic survey of earth formations beneath a body of water, the method comprising the steps of:
- (a) forming a trench in the bottom of the body of water employing an autonomous or remotely operated vehicle at the bottom of the body of water;
- (b) lining the trench;
- (c) deploying a seismic cable having a plurality of seismic sensors distributed therealong in the lined trench;
- (d) operating an acoustic source in the body of water to produce seismic signals which enter the formations;
- and
- (e) detecting seismic signals which return from the formations with said sensors.
Dependencies are inferred from the claim text.