Abstract:
A seismic data acquisition system (100) includes a recording unit (102) to record acquired seismic data and ground equipment (107) containing surface units (108)and wireless field digitizer units (110). Each surface unit is in communication with the recording unit and contains a first wireless communication module (702) and a power supply mechanism transmitter coil (716). Each wireless field digitizing unit includes a seismic sensor unit (212), a second wireless communication module (202) in communication with the seismic sensor unit and one of the first wireless communication modules to exchange digital data between the first and second wireless communication modules and a power supply mechanism receiver coil (210). The power supply mechanism receiver coil is magnetically coupled to the power supply mechanism transmitter coil in one of the surface units to transmit electrical energy wirelessly from the surface unit to the wireless field digitizer.
Abstract:
Node, system and method for collecting seismic data. A node (300) for collecting seismic data includes a base (302) configured to land on the ocean floor; and a head (304) connected to the base (302) through a connecting member (306) and configured to bury itself into the ocean floor. The head (304) includes a seismic sensor (334a) configured to detect seismic data and first to third burying units (450A- C) configured to bury the head (304).
Abstract:
The present invention relates to a seismic sensor node and corresponding measuring device for point measurements in seismic surveys of geological subsurface formations, where the sensor node includes a sensor housing with at least one movement sensor, the sensor node comprising a plate structure being adapted to be positioned into the sea bed, the sensor housing having a predetermined outer shape and the plate structure being adapted to receive and essentially enclose the sensor housing for providing acoustic coupling between the plate structure and the sensor housing, and the plate structure having a rotational symmetric structure with a vertical axis. The plate structure comprises a number of radially oriented plates secured together and being adapted to penetrate the sea bed with minimal displacement of the sea bed materials.
Abstract:
A dual core geophone includes a dual magnetic core packaged in a housing providing higher sensitivity and a reduction of electric wires in the device. The geophone includes a locking mechanism for the dual magnetic core to protect the device from strong vibrations when the device is not in use. A method for measuring acoustic vibrations in a downhole with a dual core geophone as above includes locking the dual magnetic core when the geophone is not detecting acoustic vibrations.
Abstract:
The invention relates to a carrier module 30 for an underwater antenna with at least one carrier element 34, on which at least one converter element 36 is fastened elastically by means of a bush 40 and a grommet 42, as well as to a corresponding method for fastening a converter element 36 on the carrier module 30, said method having the following steps: a) inserting the grommet 42 into the bore 44 provided for this purpose in the carrier module 30, b) inserting the bush 40 into the grommet 42, c) adhesively bonding the converter element 36 into the bush 40 by means of a casting compound, and d) filling the bush 40 with the casting compound on the side remote from the converter element 36. In addition, the invention relates to an acoustic underwater antenna, in particular a towed antenna 4, with at least one above-described carrier module 30, on which at least one converter element 36 is fastened in accordance with the above-described method.
Abstract:
The device for measuring vibrations, particularly seismic ones, incorporating a base assembly (1) and the inert mass (2), which contains measuring arms (4) and a reference interferometer (3) attached to the base assembly (1) and the inert mass (2), so that the reference arm (3) is permanently and indissociably fixed to the base assembly (1) and the measuring arm (4) is attached to the inert mass (2) in such a way that at least a part of the measuring arm (4) is immobilised on the surface of or in the structure of the inert mass. The method of measuring vibrations, especially seismic ones, including the base (1) and the inert mass (2), to which the arms of at least one fibre-optic interferometer are attached, the reference arm (3) of which is permanently and indissociably fixed to the base (1), and the measuring arm (4) is fixed to the inert mass (2) and has at least one frail, movable section and which is placed in the location where vibrations, especially seismic ones, are observed, after which a light beam is introduced through at least one input coupling element, which is distributed in at least one input coupling element (5).
Abstract:
A seismic receiver may acquire seismic data reflected from one or more subterranean features of the Earth. The seismic receiver may include a housing and a four- component sensor that may measure four properties of a seismic wavefield. The four- component sensor may be disposed within the housing. The seismic receiver may also include a particle motion sensor that may measure a particle motion of the seismic wavefield in at least one direction. The particle motion sensor may be disposed within the housing, such that the four-component sensor and the particle motion sensor are separated by a distance in a first direction.
Abstract:
A method for processing seismic data may include receiving, via a processor, the seismic data acquired via a seismic survey. The seismic survey may include seismic sources that emit seismic wavefields at different locations. Each of the seismic sources may change a directivity pattern of a respective seismic wavefield based on a respective location of the respective seismic source. The seismic survey may also include seismic receivers that may receive the seismic data. The method may also include generating one or more basis functions that correspond to measurements of the seismic data, modelling a signal component of the seismic data as a sum of the one or more basis functions, and storing the signal component in a storage component. The signal component may be used to acquire an image of a subsurface region of the earth for identifying a feature in the subsurface region of the earth.