Abstract:
An ocean bottom seismic cable recording apparatus comprising a plurality of seismic node casings (1), said node casings being separated from each other by separate stress member sections (2), each stress member section having acoustic decoupling arrangements (3) at each end connecting to said seismic node casings (1), and where each seismic node casing comprising an autonomous sensor capsule (5) for sensing and recording seismic data, and wherein the autonomous sensor capsule (5) is removable from said seismic node casing (1), and wherein each seismic node casing (1) further comprising an inner compartment (4) accommodating the autonomous sensor capsule (5).
Abstract:
Method and device for cleaning a marine seismic equipment. The device includes a body, a propulsion system for moving along the streamer, a cleaning device for cleaning the equipment, and a control device for controlling a movement of the device.
Abstract:
A streamer for seismic prospection comprising directional sensors (20), such as geophones or accelerometers, distributed along the streamer, characterized in that said streamer comprises at least two tilt sensors (30, 40) located in remote positions and in locations distant from the directional sensors (20) and means which determined the effective orientation of each directional sensor (20) by interpolating along the streamer the tilt detected by the two tilt sensors (30, 40).
Abstract:
An apparatus includes a streamer having one or more sensor holders for retaining seismic sensors therein. A housing is disposed about a sensor with a gel-like material disposed between the housing and the sensor, thereby decoupling the sensor from its surroundings. The housing is disposed in the sensor holder and the streamer is filled with either liquid or another gel-like material.
Abstract:
The present invention relates to a seismic cable (3) comprising at least two sensor nodes (4), the cable being adapted to lie permanently on a seabed (5). By covering each sensor node (4) and a length of the cable (3) connecting the sensor nodes (4) with a flexible protective socket (7), there is obtained a leak-tight connection, whereby penetration of water and/or moisture into the components of the sensor node (4) is not permitted.
Abstract:
The invention concerns a method for seabed seismic acquisition. According to the invention, a pair of geophones (3a, 3b) is placed on the seabed and mounted in opposite directions so that the axes of maximum sensitivity of the geophones lie substantially orthogonal to the surface of the seabed. The invention also concerns a device for seismic acquisition and a seabed seismic node.
Abstract:
A system comprises marine geophysical equipment, adapted for towing through a body of water; and tightly fitting covers, attached to the marine seismic equipment, to fill-in indentations in the marine geophysical equipment, for gathering marine geophysical data. A method comprises marine geophysical equipment having tightly fitting covers, to fill-in indentations in the marine geophysical equipment, attached thereto, for gathering marine geophysical data.
Abstract:
In a first embodiment of the present invention, a hydrophone is provided comprising: a rigid tubular substrate; an annular cavity formed around the rigid tubular substrate by affixing a tubular diaphragm around the rigid tubular substrate; a flexible piezoelectric element wrapped around and bonded to the flexible tubular diaphragm; and a molded portion covering the piezoelectric element.
Abstract:
An embodiment of the disclosed invention includes a method for attenuating noise during acquisition of marine seismic date. The method includes placing a seismic streamer in a body of water. The seismic streamer includes a streamer body having a length and a channel, a seismic sensor disposed within the channel, and a gel disposed within the channel. The gel has a complex viscosity of at least 50 Pascals and includes a concentration of a polymer between the range of about 5% and about 25% by weight. The method also includes placing a source in the body of water. The seismic streamer and the source are towed through the body of water and the source is fired while being towed through the body of water. Data is collected from the seismic streamer as it is towed through the body of water.
Abstract:
A disclosed pressure-responsive sensor includes a flexible element contained within an enclosure and a membrane configured to exert an electrostatic force on the flexible element to cause the flexible element to respond to pressure variations on the membrane. A disclosed pressure-sensing method includes electrostatically coupling a membrane to a flexible element contained within an enclosure to transfer a pressure response of the membrane to the flexible element. Motion of the flexible element is converted into a pressure signal.