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7539279 |
Logarithmic spectrum transmitter waveform for controlled-source electromagnetic surveying
Waveforms for controlled source electromagnetic surveying. The waveforms have frequency spectra that include three or more frequencies spaced at substantially equal intervals on a logarithmic...
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7466632 |
Method and apparatus for positioning a center of a seismic source
The present invention provides a method and apparatus for positioning a center of a seismic source. The method includes determining a desired center-of-source of the seismic source and selecting...
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7463549 |
Apparatus and method for carrying out seismic surveys
A 4D seismic source comprising a series of sub-arrays of guns on flotation devices. Each flotation device has a GPS device. For firing, the guns in the e.g. three sub-arrays identified as being...
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7377357 |
Marine seismic acquisition method and apparatus
A marine seismic source method capable of retaining low frequencies is disclosed. One embodiment of the method comprises a seismic source that generates an up-going wave and first down-going wave...
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7359282 |
Methods and apparatus of source control for borehole seismic
A method and apparatus for controlling seismic sources. The method and apparatus enable firing of a seismic sources at either a precise time or a precise position of the seismic source. Controlling...
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7339852 |
Seismic acquisition system
A seismic acquisition system comprising a remote-controlled buoy for conducting seismic acquisition operations. The buoy comprises an operating system for operating a seismic wave production device...
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7218572 |
Method of seismic source monitoring using modeled source signatures with calibration functions
Physical parameters are measured for an array of seismic sources, preferably for each activation of the seismic sources. Calibration functions are obtained and the measured physical parameters and...
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7210556 |
Method and apparatus for installing a sensor array
An apparatus and method is provided for transporting, installing, retrieving, and replacing a sensor array of individual sensor pods at a geographically remote location, such as on the sea floor....
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7042803 |
Marine seismic source towing apparatus and method
A marine acoustic source system has relativley densely packed energy sources arrayed in a tandem-like fashion along a horizontal plane. Preferably, a longitudinal axis of each source lies...
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7028807 |
Non-explosive acoustic source
A non-explosive acoustic source utilizes the combustion of aluminum and water to generate an acoustic pulse. The operation of the non-explosive acoustic source relies on a water/aluminum reaction...
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6961284 |
Source array for use in marine seismic exploration
A staggered vertical marine seismic source contains upper and lower arrays ( 10, 11 ) of emitters of seismic energy (S11, S12; S21, S22). The upper array ( 10 ) is horizontally displaced relative...
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6951262 |
Method and apparatus for suppressing waves in a borehole
Methods and apparatus for suppression of wave energy within a fluid-filled borehole using a low pressure acoustic barrier. In one embodiment, a flexible diaphragm type device is configured as an...
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6932185 |
Acquisition method and device for seismic exploration of a geologic formation by permanent receivers set on the sea bottom
A method and device for seismic exploration of a subsea geologic formation by pickups set on the sea bottom and intermittently connectable to active data acquisition stations ( 11 ) brought nearby....
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6814180 |
Monopole-driven underwater sound source
An underwater sound source which comprises a housing having an inner and an outer surface and a monopole driver suspended within the center of the housing. The housing is adapted to receive fluid...
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6612396 |
Controlled-polarization marine seismic shear-wave source
Controlled-polarization marine seismic shear-wave source has a base suitable for positioning on a seafloor, beneath a water body. Twin water-blast tubes (seismic-impulse-generation thrusters) are...
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6571906 |
Underwater sound mitigation system for explosive testing
A sound mitigation system and method reduce the transmission of acoustic output from explosions underwater. The system is submerged to bottom terrain of a body of water and has at a series of...
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6510270 |
Sub-oceanic cable network system and method
A cable system for installation on the ocean floor or under another body of water includes a plurality of sub-sea junction boxes installed at spaced locations throughout a predetermined sub-oceanic...
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6260657 |
Seismic pulse generator
A seismic pulse generator (1) has a chamber (4) pressurised with gas. The generator includes a solenoid valve (60) which can be actuated to cause the release to atmosphere of only a small amount of...
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6144618 |
Seismic cable boot and hydrophone retainer
A molded protective body member for seismic cable hydrophone and geophone sensors and their cable splice connections from underwater obstructions and pay-out and retrieval apparatus. The body...
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5632659 |
Combustion chamber drain system
An apparatus for quickly and virtually complete purging of seawater from combustion chambers of an outboard engine that has been submerged or a submersible outboard engine. A poppet valve is...
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5341343 |
Underwater explosive acoustic signature device
An explosive actuated acoustic device emits sound to be used in torpedo countermeasures. Numbered devices are delivered over an extended area and sink through the water. The devices are actuated at...
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5339288 |
Underwater sound source with remote controlled actuator
An underwater sound source with a remote controlled actuator comprising a oy having a buoyant portion, a plurality of launch tubes storing acoustic charges, a radio transceiver, control circuitry,...
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5247486 |
Method for determining the far-field signature of a plurality of seismic sources
A method for determining a far-field signature FF(t) of a plurality of N seismic sources Si (i=1, . . . , N) comprises a stage of measuring a near-field signature NFi(t) of each seismic source Si....
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5229977 |
Directional underwater acoustic pulse source
A closed-cycle combustion low-frequency acoustic pulse source for use underwater. An elongated combustion chamber, having a first end and a second end and an elongated elastic sleeve, is filled...
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5183966 |
Termination assembly with improved waterblock
A termination assembly is disclosed providing a substantially watertight, yet field serviceable interface to a plurality of electrical splices. The termination assembly includes a housing having an...
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5105801 |
Method and apparatus for improving the reproducibility and efficiency of the pressure waves generated by a shock wave generating apparatus
The present invention relates to a method and device for discharging an electric current between two electrodes, comprising considerably reducing the resistance to the passage of electric current...
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4908801 |
Real-time simulation of the far-field signature of a seismic sound source array
A method for extrapolating the far field signature of a seismic sound source array from near field measurements, by taking into consideration, the instantaneous firing and environmental parameters...
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4868794 |
Method of accumulation data for use in determining the signatures of arrays of marine seismic sources
In order to accumulate data from which the signature of an array of n interacting seismic sources 21 to 27, for instance marine seismic sources in the form of air guns, can be determined, the array...
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4764906 |
Plasma jet underwater acoustic source
A novel device and method are provided herein for the production of underwater sound. This device, termed a plasma jet underwater acoustic source includes a central electrode and a concentric...
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4733382 |
Pneumatically-operated liquid slug projector apparatus
The liquid slug projector apparatus is entirely pneumatically operated. It comprises a generator having a main housing whose main port fluidly communicates with a liquid body. A first shuttle and a...
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4719987 |
Bi-planar pontoon paravane seismic source system
A bi-planar pontoon paravane is towed by a marine vessel and controls the depth and position of a towed seismic source array. The bi-planar pontoon paravane is made up of a buoyant bridge with...
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4713800 |
Seismic air gun
A seismic air gun has a passage between the stem of its shuttle and a baffle, whereby ambient pressure can reach the back of the operating piston. The gun is fired by dumping a small quantity of...
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4712202 |
Method and apparatus for converting an air gun into a hydro gun for marine seismic impulse generation
A marine air gun is advantageously converted into a hydro gun by substitution of two clamp rings and by convenient addition of various parts, allowing normal air gun firing by triggering with usual...
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4667766 |
Seismic pulse generator
A seismic acoustic source for generating acoustic pulses in both solid rock and sedimentary layers on land and in both water, rock and sedimentary layers at sea comprises: two chambers; a high...
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4658384 |
Method for determining the far-field signature of an air gun array
The far-field pressure signature of an air-gun array is derived from near-field measurements. An array of air guns is deployed in the water at a desired depth. A hydrophone is suspended in the...
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4648479 |
Multiple-port, multiple-chamber, tuned air-powered subsea seismic source
The invention is a multi-port, multi-chamber, tuned, air-powered subsea seismic source. It is suitable for producing a seismic wave in a subsea environment during seismic prospecting....
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4648080 |
Method for determining the far field signature of a marine seismic source from near-field measurements
A method for obtaining far-field signatures of marine source arrays by the downward continuation of near-field data recorded along a short signature streamer of closely spaced hydrophones, located...
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4644507 |
Scaling of sound source signatures in underwater seismic exploration
The invention relates to a method of determining the location in the earth of sub-surface boundaries and/or the acoustic properties of sub-surface features substantially in the absence of the far...
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4633969 |
Signalling device
A device for under-water signalling has a chamber (38) which is normally closed by a replaceable element (39). A cartridge (16) in the device can be fired to release gas into the chamber and...
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4599712 |
Modular airgun array method, apparatus and system
A plurality of control station, watertight, submerged junction boxes are towed at spaced positions located along an airgun array, each junction box for including a microprocessor and data storage...
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4594696 |
Gun cable termination
A means for terminating of splicing a cable intended for towing air-water guns behind a seismic vessel. The end of the cable, or of each cable section, is guided into the housing of the termination...
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4556120 |
Modular gas-powered subsea seismic source
The invention is a device known generically as an "air gun" suitable for producing a shock wave in a subsea environment during seismic prospecting. It is made up of a central chamber holding...
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4503929 |
Sleeve valve for an air gun having a reciprocating shuttle valve
An air gun of the reciprocating shuttle type includes a split-ring sleeve valve that is expandable against the inner wall of a firing chamber. The sleeve valve encircles the shuttle body. The...
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4500978 |
Seismographic method and apparatus using scaled sound sources
A seismic method and apparatus utilizes two point sound sources located at the same location on the earth to produce sound waves at different amplitudes and times. The reflections of the sound...
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4476553 |
Method of determining the signatures of arrays of marine seismic sources
In order to determine the signature of an array of n seismic sources 21 to 27, for instance marine seismic sources in the form of air guns, the array is actuated and the emitted pressure wave is...
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4472794 |
Sleeve shuttle air gun
A sleeve shuttle air gun is described which can be fired by a solenoid valve without dumping compressed air into the ambient prior to firing, thereby avoiding the generation of premature impulses...
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4427091 |
Fail-safe circuit mechanism for generating a pulse indicating the precise moment of firing of a gas exhausting gun
A new circuit is added to the old electrical circuit including two electrodes underwater positioned very close to a gas exhausting gun gaseous exhaust such as an air gun, wherein the exhaust from...
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4405033 |
Fail-safe methods for generating a pulse indicating the precise moment of firing of a gas exhausting
New methods are disclosed for detecting the instant of firing of a gas exhausting gun such as an air gun which reduce plating action on two closely spaced apart electrodes submerged underwater very...
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4384632 |
Charging system for seismic gas exploder
Oxygen and propane are supplied to the combustion chamber of a marine seismic gas exploder from a pair of pressure regulated gas charging cylinders. Ignition of the resultant explosive gas mixture...
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4382486 |
Tuned air gun array
The present invention provides a method for determining the spacing and size of air guns in a tuned air gun array. Volume ratios are calculated based upon a predetermined maximum volume for any...
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