Matches 401 - 430 out of 430 < 1 2 3 4 5 6 7 8 9


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4577297 Method for enhancing recorded marine seismic reflection signals having undulating water bottom distortions  
In marine seismic exploration, seismic energy is transmitted through a water layer into the earth and seismic reflection signals from subsurface interfaces are recorded. Any undulating water...
4577298 Method for correcting surface consistent statics in seismic traces  
Disclosed is a method for estimating and correcting source and receiver statics contained in recorded and gathered seismic traces. Measurements based on the time of arrival of reflection and...
4571710 Seismic method for identifying low velocity subsurface zones  
This invention consists of producing a two-dimensional display from exploration seismic data designed to indicate zones of anomalous low velocity in the subsurface. Such zones may be indicative of...
4562557 Method and apparatus for determining acoustic wave parameters from acoustic well logging waveforms  
Methods and apparatus are described for estimating parameters, such as slowness and attenuation, of composite acoustic waves obtained in the course of sonic logging of formations traversed by a...
4545039 Methods for seismic exploration  
Sweeps of seismic signals consisting of pulse trains having a predetermined number of pulses in which the periods or durations of the pulses are randomized and in which the wave shape and relative...
4488270 Acoustic impedance log obtained from seismograms  
In seismic exploration, an improved synthetic acoustic log is produced from seismograms by combining band limited reflectivity and velocity functions, both of which are obtained from the...
4437176 Method of optimizing signal-to-noise ratio in seismic exploration  
A method for improvement of the signal-to-noise ratio of seismic data records comprising determination of the angle of incidence of acoustic waves transmitted into the earth with respect to...
4359766 Method for reconnaissance geophysical prospecting  
A method for deriving seismic information of more generalized nature over a relatively large and previously unexplored expanse of land to determine relevant strike, dip, velocity and related...
4330872 Common-offset-distance seismic trace filtering  
A multiple coverage seismic exploration technique provides for a plurality of seismic trace recordings along a line of exploration. From these recordings, sets of common-offset-distance traces are...
4326262 Universal signal generator and signal parameter comparator  
A novel universal signal generator is disclosed comprising a composite system including a library or bank of signals consisting of pre-recorded signals of desired form which may be selected as the...
4253164 Multi-purpose seismic transducer  
A multi-purpose seismic transducer includes a first seismic sensor having a first transfer function. A transfer-function shaping filter is coupled to the output of the first seismic sensor. The...
4236233 Interactive multidimensional classification and sorting of seismic segment data  
The specification discloses a method and system wherein an operator interacts with an automatic data processing and display system to classify and sort subsurface reflective surfaces or segments...
4031505 Seismic system with signal-to-noise determination  
An improvement to a seismic system, which provides data words, having digital signals corresponding to sensed vibrations in an earth formation or to noise occurring in a seismic system, permits...
3898610 Method for prediction of abnormal pressures from routine or special seismic records  
A technique for determining depth of highly pressurized formations wherein a seismic observation is performed to produce a multitrace seismogram, reflection events thereon are identified, the...
3813784 GRAPHIC DETERMINATION OF INTERVAL VELOCITY  
Velocity in a subterranean interval is determined graphically from Root-Mean-Square (RMS) velocities at the end point of intervals by plotting time vs. velocity squared. A straight line can be...
3748524 IMAGE CORRELATOR TUBE WITH CROSSED FIELD DEFLECTION  
A device of the image orthicon type is disclosed for electrooptical integration and correlation systems utilizing a crossed electric and magnetic field deflection region and a retarding potential...
3621380 METHOD AND APPARATUS FOR SEISMIC-MAGNETIC PROSPECTING  
Seismic disturbances are impinged upon underground magnetic bodies to cause time varying changes in the magnetic field of the bodies. These time varying changes are sensed to provide indications...
3521037 APPARATUS AND METHOD OF RECEIVING DISTURBED SIGNALS  
3517173 DIGITAL PROCESSOR FOR PERFORMING FAST FOURIER TRANSFORMS  
3353151 Common tangent stacking method and system for locating sonic energy velocity discontinuities  
3183437 Method and apparatus for wave form analysis  
3136974 Method for removing echo effects from seismograms  
3101467 Seismic record picker  
3077573 Seismographic apparatus and method  
3012234 Noise reduction in pulse-width modulated recording  
2982923 System of seismic recording  
2900619 System for recording time  
2878999 Interpolation function network  
2836359 Integration of electrical signals  
2826750 Method of removing noise from seismic signals  

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