33 results about "Seismic array" patented technology

A method and apparatus comprising an active control system for a towed seismic streamer array that enables any relative positional control of any number of towed seismic streamers. The streamer positions are controlled horizontally and vertically using active control units positioned within the seismic array. The three component (x, y, z) position of each streamer element, relative to the vessel and relative to each other is controlled, tracked and stored during a seismic data acquisition run. The present invention enables a seismic array to be maneuvered as the towing vessel maintains course, enables maintenance of specific array position and geometry in the presence of variable environmental factors and facilitates four-dimensional seismic data acquisition by sensing and storing the position of the array and each array element with respect to time.

Microseismic mapping using buried arrays with the integration of passive and active seismic surveys provides enhanced microseismic mapping results. The system is initially set up by recording seismic data with the buried array installation while shooting a significant portion of the 3D surface seismic survey. The 3D surface seismic survey provides the following data: shallow 3D VSP data from the buried arrays; P-wave and converted wave data for the area covered by the buried array that benefits from the planned data integration processing effort; and microseismic data and associated analysis.

The present invention provides an improved method and apparatus for positioning seismic arrays. The method comprises determining a first position of an array, deploying the array, collecting inertial data at a plurality of points on the array once the array is at least partially deployed, and determining a second position of the array by augmenting the first position with the inertial data. The apparatus comprises a seismic array, an inertial sensor mounted on the seismic array and capable of gathering inertial data, and a computing device adapted to receive and analyze the inertial data to determine a position for the seismic array from the inertial data.

A system for a more efficient towing of a marine seismic array comprising one or more diverters attached to each lead-in cable. Because each lead-in cable has its own diverter, the need for dedicated towing ropes and taglines between lead-in cables is eliminated, thereby reducing the overall drag and fuel consumption. The diverters of the present invention are directly attached to the respective lead-in cables and are submerged, eliminating the need for taglines and additional flotation. The diverter of the present invention comprises of either a single span-wise hydro foil or two foil sections and is steerable. Similarly, the diverters of the present invention can be installed on the umbilical cables of seismic source subarrays to obtain the same benefits. As such, at least one diverter of the present invention can be attached directly to at least one umbilical cable of the seismic source subarray.

Marine seismic survey systems and methods are presented. One system comprises a source array, a tow vessel, one or more source tow members, one or more deflecting members operatively connected to the source array; one or more streamers connected to the tow vessel by a corresponding number of streamer tow members, one or more of the streamers positioned by corresponding one or more active or passive streamer deflectors, one or more source separation members connecting one or more source tow members to one or more streamer tow members, and optionally one or more streamer separation members connecting one or more streamer tow members. The one or more source separation members help position the source array in conjunction with the one or more. deflecting members. This abstract complies with rules requiring an abstract. It should not be used to limit the scope or meaning of the claims. 37 CFR 1.72(b).

The present invention relates generally a method and apparatus for adjusting the buoyancy of towed seismic arrays comprising a plurality of streamers and specifically to the dynamic buoyancy control of the buoyancy of a towed array of streamers by means of applying current to electroactive polymers (EAP) incorporated within the towed array of seismic streamers. The bulk density of the streamer array is electrically altered to accomplish neutral buoyancy for a towed array of streamers within the full range of water-densities from fresh to extremely dense seawater.

The present invention relates generally a method and apparatus for adjusting the buoyancy of towed seismic arrays comprising a plurality of streamers and specifically to the dynamic buoyancy control of the buoyancy of a towed array of streamers by means of applying current to electroactive polymers (EAP) incorporated within the towed array of seismic streamers. The bulk density of the streamer array is electrically altered to accomplish neutral buoyancy for a towed array of streamers within the full range of water-densities from fresh to extremely dense seawater.

An over / under seismic source system includes a first umbilical to a first gun array at a first depth and a second umbilical at a different air pressure to a second gun array at a second, lower depth. The air pressure to the second, lower gun array is tuned so that the periods of the gun bubbles from the higher and lower gun arrays match in order to improve wavefield separation in subsequent data processing.

The present invention discloses a seismic array of an underwater earthquake simulation vibrostand. The seismic array comprises a seismic array pedestal arranged on a power base, and a deep pool arranged on the seismic array pedestal. Two vibrostand surfaces are arranged in the deep pool. The lower parts of the vibrostand surfaces are provided with a horizontal actuator, a vertical actuator and a guide device arranged via a hydrostatic back-up. One side of the deep pool is provided with a reaction wall, and the other side of the deep pool is provided with an oil transmission pipeline for connecting an oil pump station with an accumulator group. The inner side thereof is provided with a wave maker group. The bottom of the reaction wall and the lower part of the deep pool are respectively provided with manholes. According to the invention, the dynamic test on large engineering structure under the coupling excitation effect of waves, the water flow and the earthquake is realized. meanwhile, the coupling effect of multi-point and multi-dimensional earthquake and wave power is realized. The seismic array is long in period, large in displacement, good in high-frequency seismic property and higher in operability. The synchronous / asynchronous control of two vibrostands, the generation of waves and seawater, and the synchronous / asynchronous control of the vibrostand seismic array excitation are realized.

A system for a more efficient towing of a marine seismic array comprising one or more diverters attached to each lead-in cable. Because each lead-in cable has its own diverter, the need for dedicated towing ropes and taglines between lead-in cables is eliminated, thereby reducing the overall drag and fuel consumption. The diverters of the present invention are directly attached to the respective lead-in cables and are submerged, eliminating the need for taglines and additional flotation. The diverter of the present invention comprises of either a single span-wise hydro foil or two foil sections and is steerable. Similarly, the diverters of the present invention can be installed on the umbilical cables of seismic source subarrays to obtain the same benefits. As such, at least one diverter of the present invention can be attached directly to at least one umbilical cable of the seismic source subarray.

The invention relates to a method for correlating monitoring signals of seismic-infrasonic identical address stations. On the basis of a Pg-Lg seismic phase pair and a Pn-Lg seismic phase pair, the seismic source position is estimated by means of a seismic signal, an infrasonic signal is searched and matched, recorded signals of a seismic array station, a three-component seismic station and an infrasonic station can be correlated, and monitoring signals of the seismic station and the infrasonic station which are incompletely on the identical address can be correlated. According to the invention, regional events of 25 seismic-infrasonic identical address stations of an international infrasonic monitoring system can be correlated quickly, on the basis of the seismic station and the infrasonic station which are on the identical address, regional explosion events can be identified relatively accurately, and global infrasonic event processing and analyzing pertinency and efficiency can be improved. The fact that two kinds of waveform monitoring methods including the seismic monitoring method and the infrasonic monitoring method which are distributed on the identical address are combined for observing the regional events, and limited stations are utilized to monitor and identify small-yield explosion events is achieved.

Embodiments of a system are provided for forming enhanced seismic array traces using virtual seismic sensors in addition to the real seismic sensors to form a virtual seismic array. The system receives the signal responses from the real sensors, processes the signal responses from the sensors to define virtual signals using a narrowband decomposition of the complex envelope of the sensor signal responses, calculates second- and fourth-order statistics to derive steering vectors for the array of real sensors, and forms a virtual seismic array in response thereto. Machines, computer program product, and computer-implemented methods are provided for forming enhanced seismic array traces by receiving the array responses from sensors, processing the signals to define virtual sensor signals and a virtual seismic array, and forming an array response for the virtual seismic array to form a seismic trace of enhanced resolution.

A method and apparatus for determining formation parameters including a seismic array for receiving seismic waves at plurality of depth simultaneously, thereby enabling a determination of a formation velocity by using a difference in the seismic waves received by the various portions of the array.

Microseismic mapping using buried arrays with the integration of passive and active seismic surveys provides enhanced microseismic mapping results. The system is initially set up by recording seismic data with the buried array installation while shooting a significant portion of the 3D surface seismic survey. The 3D surface seismic survey provides the following data: shallow 3D VSP data from the buried arrays; P-wave and converted wave data for the area covered by the buried array that benefits from the planned data integration processing effort; and microseismic data and associated analysis.

A parachute type seismograph comprises a body which is internally provided with a seismic data measuring and recording device, a communication device and a power supply device, wherein a parachute isarranged at the top of the body; and a position adjusting device is arranged at the bottom of the body. According to the parachute type seismograph and a seismic array layout method involved in the invention, a traditional artificial ground layout is replaced by an aerial throwing layout, so that the limitation of road traffic and construction environment is broken through; and seismic array layout work can be carried out in depopulated zones such as gobi desert and alpine snowfield, so that field construction risk is reduced and the working efficiency is high. The adopted parachute type seismograph has the functions of parachute landing and automatic parachute separation, and can prevent unstable posture of the seismograph due to coverage of the seismograph body by the parachute or the action of wind force while providing the buffering and landing functions for the seismograph; and the parachute type seismograph has a heeling condition and an azimuth automatic adjusting function, thereby improving the accuracy of seismic surveys.

Methods and apparatus for reducing the impact of guided (or “tube”) waves in permanently installed seismic systems are provided. By utilizing passive acoustic absorbers, the impact of tube waves may be reduced, leading to improved performance of permanently installed seismic systems that are installed onto production tubing when the well is completed.

A multimode seismic unit can selectively operate in any one or more of multimode readout modes. In one embodiment, a multimode seismic unit (1600) includes a physical mode selector switch (1602). The mode selector switch (1602) allows for manual selection of output modes including wireless, nodal, dual mode or automatic mode selection. The unit (1600) further includes an antenna (1604) for RF transmissions and a data port (1606) for uploading data in a nodal mode. The multimode unit can be used to implement a variety of single mode and multimode seismic arrays.

Embodiments of a system are provided for forming enhanced seismic array traces using virtual seismic sensors in addition to the real seismic sensors to form a virtual seismic array. The system receives the signal responses from the real sensors, processes the signal responses from the sensors to define virtual signals using a narrowband decomposition of the complex envelope of the sensor signal responses, calculates second- and fourth-order statistics to derive steering vectors for the array of real sensors, and forms a virtual seismic array in response thereto. Machines, computer program product, and computer-implemented methods are provided for forming enhanced seismic array traces by receiving the array responses from sensors, processing the signals to define virtual sensor signals and a virtual seismic array, and forming an array response for the virtual seismic array to form a seismic trace of enhanced resolution.

The invention discloses a method for measuring water depth across the seismic array, comprising: emitting signals via an acoustic pulse emitter in seismic array; measuring the arrival time of the signal bottom reflected to a receiver in a seismic geophone; measuring the time of the signal directly reaching the receiver; and determining water depth according to the measured arrival time of the signals.

A multimode seismic unit can selectively operate in any one or more of multimode readout modes. In one embodiment, a multimode seismic unit (1600) includes a physical mode selector switch (1602). The mode selector switch (1602) allows for manual selection of output modes including wireless, nodal, dual mode or automatic mode selection. The unit (1600) further includes an antenna (1604) for RF transmissions and a data port (1606) for uploading data in a nodal mode. The multimode unit can be used to implement a variety of single mode and multimode seismic arrays.

Systems and methods related to allocation of multiplexing signatures to wireless data acquisition modules in a seismic array with real time wireless read out. The allocation may include selecting an index value offset from an adjacent index value to form serial data transfer paths wherein reuse of multiplexing signatures are spaced as far apart as possible in serial data path. In an embodiment the allocation of multiplexing signatures may be adaptive wherein a module may scan for the presence of signals utilizing a plurality of multiplexing signatures and in turn employ a multiplexing sequence that avoids any detected noise that could lead to interference. The detected noise may be attributable to sources within the survey area or from ambient noise present in the area.

The invention relates to a method for correlating monitoring signals of seismic-infrasonic identical address stations. On the basis of a Pg-Lg seismic phase pair and a Pn-Lg seismic phase pair, the seismic source position is estimated by means of a seismic signal, an infrasonic signal is searched and matched, recorded signals of a seismic array station, a three-component seismic station and an infrasonic station can be correlated, and monitoring signals of the seismic station and the infrasonic station which are incompletely on the identical address can be correlated. According to the invention, regional events of 25 seismic-infrasonic identical address stations of an international infrasonic monitoring system can be correlated quickly, on the basis of the seismic station and the infrasonic station which are on the identical address, regional explosion events can be identified relatively accurately, and global infrasonic event processing and analyzing pertinency and efficiency can be improved. The fact that two kinds of waveform monitoring methods including the seismic monitoring method and the infrasonic monitoring method which are distributed on the identical address are combined for observing the regional events, and limited stations are utilized to monitor and identify small-yield explosion events is achieved.

A cable for land based seismic array system includes a plurality of fibers, an aramid strength member, and a thermo-plastic polyurethane (TPU) Jacket, wherein a total number of the plurality of fibers is greater than or equal to 48, a diameter of the cable is less than 10 millimeter (mm), and a weight of the cable per unit distance is less than 50 kilogram (Kg) / kilometer (Km).

A ribbon-foil depressor is incorporated into a towed seismic array to provide downward lift to array sections or components. The ribbon-foil depressors may be deployed on the port and starboard spur lines or on the outboard separation ropes. The ribbon-foil depressors may be used to submerge and operate seismic equipment at depths as low as 60m or more and are capable of maintaining towed seismicstreamer cables at these depths and still remain stable through various speed changes and turns.

The invention belongs to the field of geophysical exploration, and provides (1) a long-distance transmission node; (2) reduces the overhead of the internal transmission line of the seismic exploration array system; (3) provides a data transmission node for geophysical exploration ; (4) Provide a general long-distance data transmission node for geophysical exploration with an adjustable or adaptive serial data transmission rate between nodes between 50Kbps-300Mbps. For this reason, the technical scheme that the present invention adopts is that the data transmission node of geophysical exploration is made up of uplink path, downlink path, acquisition module transmission interface; It consists of a level matching network, a clock / data restorer, a first command transponder, a second level matching network, an NRZI / MLT-3 encoder, and a second transformer. The invention is mainly applied to geophysical exploration.

The invention belongs to the technical field of underground metal ore detection, and in particular relates to a detection method for deep metal ore in a mining area. According to the source position of the mining blasting in the mining area, a blasting signal receiving system is arranged on the surface to receive and store the earthquake generated by the mining blasting within a certain period of time. After the signal and noise are received, the data will be transmitted to the computer for analysis and processing, and the distribution of the deep metal deposits in the mining area will be analyzed accordingly. Using mining blasting signals to detect deep metal mines, that is, using underground mining blasting in mining areas as the seismic source, without artificially generating seismic sources, greatly reduces costs, and is convenient for field operations. The seismic array has the advantages of active source and passive source exploration at the same time.

The invention belongs to the technical field of detection of underground metallic ores, and in particular relates to a method for detecting a deep metallic ore in a mining area. According to a seismicsource position of mining blasting in the mining area, a blasting signal receiving system is arranged on the earth's surface; seismic signals and noise generated by mining blasting in a certain timeare received and stored; after receiving is ended, the data is transmitted to a computer to analyze and process; and furthermore, on this basis, the distribution condition of the deep metallic ore inthe mining area is analyzed. The deep metallic ore is detected by utilization of mining blasting signals; namely, underground mining blasting in the mining area is used as a seismic source; the seismic source does not need to be artificially generated; the cost is greatly reduced; furthermore, the field operation is convenient; and a seismic array simultaneously has the advantages of active sourceand passive source exploration.

A ribbon airfoil settler is incorporated into the towed seismic array to provide downward lift to sections or components of the array. Ribbon airfoil settlers can be deployed on port and starboard spurs or on outboard split lines. The ribbon airfoil settler can be used to immerse and operate seismic equipment at depths as low as 60 meters or more, and is capable of sustaining towed seismic streamer cables at these depths through various velocity changes and Turning remains stable.