CPC G01V 1/3852 (2013.01) [G01V 1/3808 (2013.01); G01V 1/3843 (2013.01); B63C 11/40 (2013.01); G01V 2210/1427 (2013.01)] | 32 Claims |
1. A method for seismic survey by autonomous seismic nodes at a sea floor, comprising:
attaching the autonomous seismic nodes to a rope, wherein each of the autonomous seismic nodes comprises a recording unit, a memory for storing seismic signals, and a power source, and wherein the autonomous seismic nodes are detachably connected to the rope;
loading the rope with the autonomous seismic nodes into a magazine so that the rope with the autonomous seismic nodes is loosely packed in the magazine essentially without supporting structure to minimize a packing volume;
loading the magazine into a node deployer;
lowering the node deployer into the sea;
towing the node deployer above the sea floor;
deploying the rope with the autonomous seismic nodes at the sea floor from the magazine by two rollers driven by a motor arranged to pull the rope out of the magazine at a speed greater than a speed of a vessel;
collecting seismic data by the autonomous seismic nodes;
retrieving the rope with the autonomous seismic nodes from the sea floor by the two rollers driven by a motor arranged to pull the rope into the magazine, wherein the two rollers are configured to move an equal distance in opposite directions to allow a node to pass between them;
detaching the autonomous seismic nodes from the rope; and
unloading seismic data from the autonomous seismic nodes.
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