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7333393 Amplitude correction for seismic recordings  
A new approach is described based on reciprocity for estimating acquisition-related effects, which has several advantages over conventional surface-consistent processing techniques: (i) It can be...
7319637 System and methods for enhancing an image of post-stack seismic data with pre-stack seismic data features  
A system and methods for enhancing an image of post-stack seismic data, with pre-stack seismic data features, and displaying the enhanced image with the image of the post-stack seismic data are...
7315783 Traveltime calculation in three dimensional transversely isotropic (3D TI) media by the fast marching method  
A technique for calculating traveltime of a seismic wave in three dimensional tilted transversely isotropic (3D TI) media includes determining a wave vector, defining a unit vector, calculating an...
7283422 Systems for low frequency seismic and infrasound detection of geo-pressure transition zones  
Methods for determining the existence and characteristics of a gradational pressurized zone within a subterranean formation are disclosed. One embodiment involves employing an attenuation...
7266041 Multi-attribute background relative scanning of 3D geophysical datasets for locally anomaluous data points  
Methods for scanning geophysical data sets to find geological entities with specific geophysical responses entail selecting a focus sub-volume and a background sub-volume proximal to the focus...
7260021 Method of harmonic noise attenuation in correlated sweep data  
The present invention provides a method for harmonic noise attenuation in correlated sweep data in seismic exploration. The method includes forming a plurality of correlation data subsets using a...
7252174 Downhole seismic-sonic receiver  
A downhole tool for gathering formation data from inside a borehole includes a substantially tubular housing adapted for axial connection to a drill string and multiple sensors coupled to the...
7248995 Spatial position detection method, information input method, spatial position detection apparatus, and information input apparatus  
To calculate information on a relative distance or positional relationship between an interface section and an object by detecting an electromagnetic wave transmitted through the interface...
7248539 Extrema classification  
A method for automated extraction of surface primitives from seismic data is presented. A preferred embodiment of the method includes defining, typically with sub-sample precision, positions of...
7242637 Time-lapse seismic survey of a reservoir region  
A method of investigating a reservoir region in a subsurface formation by a time-lapse seismic survey. The subsurface formation comprises a further formation region adjacent to the reservoir...
7206255 Signal processing apparatus and signal processing method  
The invention provides a method and apparatus by which the direction in or the position at which a signal source such as a sound source is present is estimated. A signal or signals from a signal...
7184367 Method to convert seismic traces into petrophysical property logs  
A method to convert seismic traces to petrophysical properties is disclosed. One embodiment of the method comprises (a) deriving a combined log seismic response from at least one petrophysical log...
7164619 Method of processing marine seismic data and a method of seismic surveying  
A method of determining seismic properties of a layer of the seabed, in particular a surface or near-surface layer (5), comprises directing seismic energy propagating in a first mode at a boundary...
7154812 Method for retrieving local near-surface material information  
The invention concerns a method for retrieving local near-surface material information including the steps of:—providing a group of receivers comprising at least one buried receiver and at least...
7116182 Method and system for downhole clock having compensation  
A downhole crystal-based clock that is substantially insensitive to the factors that cause frequency deviation. The clock may be maintained at a predetermined temperature using a temperature...
7110323 Method, system and apparatus for interpreting seismic data using duplex waves  
A Method for Interpreting Seismic Data Using Duplex Waves is described. Whereas substantially horizontal boundaries are readily identified using conventional processing methods based on primary...
7099810 Acoustic logging tool having quadrupole source  
An acoustic tool that provides a reduced tool mode and enhanced accuracy for estimating shear wave propagation slowness in slow formations is disclosed. In one embodiment, the acoustic tool...
7095677 Crossplot analysis of A.V.O. anomolies in seismic surveying  
A method of seismic data analysis to provide clustering of A.V.O. data into A.V.O. anomaly types, the method comprising: obtaining successive values of a plurality of seismic attributes, each...
7095678 Method for seismic imaging in geologically complex formations  
A method for multipath imaging of three-dimensional volumes of seismic data, given the subsurface velocity distribution. Ray tracing is used to generate the volumes of information needed for...
7088639 Method for determining formation quality factor from well log data and its application to seismic reservoir characterization  
A method for seismic characterization of subsurface Earth formations includes determining at least one of compressional velocity and shear velocity, and determining reservoir parameters of...
7085195 Method for detecting earth formation fractures by seismic imaging of diffractors  
A method is disclosed for seismic imaging of subsurface diffractors. The method includes performing migration velocity analysis on a seismic time record section and depth migrating the time...
7079449 Methods and systems for low frequency seismic and infrasound detection of geo-pressure transition zones  
Methods for determining the existence and characteristics of a gradational pressurized zone within a subterranean formation are disclosed. One embodiment involves employing an attenuation...
7069200 Method intended to obtain reflection travel times from an interpretation of migrated cylindrical wave seismic data  
A method intended to obtain reflection travel times from an interpretation of seismic data in migrated cylindrical waves, for a given value of the parameter defining the slope of these waves, or...
7065004 Horizon-based residual depth migration velocity analysis  
A method is disclosed for processing seismic data. The method includes prestack depth migrating the seismic data to generate common image gathers using an initial velocity-depth model. Horizons in...
7046581 Well-to-well tomography  
A method of obtaining a spatial model of a property of part of a subsurface formation located between underground seismic receivers in which at least two sets of pairs of seismic receivers are...
7035165 Imaging near-borehole structure using directional acoustic-wave measurement  
Directional acoustic measurements made in the borehole are used for imaging a near-borehole geological formation structure and determination of its orientation. Four-component cross-dipole data...
7027354 Method of obtaining pore pressure and fluid saturation changes in subterranean reservoirs by forward modeling  
Representative embodiments provide for a computer including a program code configured to cause a processor to invert and thereafter calibrate first and second data sets, subtract the inverted...
6996028 Velocity analysis on seismic data  
A number of seismic stacks are precomputed (20) for known velocity fields. The velocity fields are chosen to span the range of velocities of interest. The stacks are then arranged (21) in the 3D...
6982927 Method for processing seismic data to identify anomalous absorption zones  
A method is disclosed for identifying zones anomalously absorptive of seismic energy. The method includes jointly time-frequency decomposing seismic traces, low frequency bandpass filtering the...
6980482 Seismic survey system  
A method of analyzing seismic survey data in which a transfer function for a geological model is derived by ray tracing techniques applied to theoretical data and the transfer function is applied...
6970397 Determination of fluid properties of earth formations using stochastic inversion  
A method of determining a fluid property in a subsurface region of interest of an earth formation uses measurements of seismic attributes on seismic data. For a test region, a plurality of...
6967898 Method of processing vertical seismic profile data using effective VTI models  
A method of applying an effective velocity model to vertical seismic profile (VSP) seismic data comprises correcting for offset using a non-hyperbolic effective velocity model so as to take...
6968274 Use of cutting velocities for real time pore pressure and fracture gradient prediction  
Disclosed is a new method for providing accurate real time predictions of pore pressure and fracture gradient, at the rig site by determining the wave velocity from drill cuttings by a portable...
6956790 Borehole sonic data processing method  
A method of processing sonic wireline or logging while drilling data acquired in a borehole that includes filtering the sonic data to attenuate tool-borne and borehole-borne arrivals; migrating...
6954403 Concurrent phase angle graphic analysis  
Waveform data, such as reflection seismic data, is filtered by concurrently analyzing various phase angles of the data. The various phase angles of the data are compared to phase rotated...
6952379 Seismic method and apparatus for generating a semblance panel and computing the reflector dip  
A method of generating a semblance panel comprises summing two or more gathers of traces. The dip of the reflector is taken into account in the summation process, and this prevents semblance peaks...
6903999 System and method for estimating seismic material properties  
A method for estimating near-surface material properties in the vicinity of a locally dense group of seismic receivers is disclosed. The method includes receiving seismic data that has been...
6894949 Walkaway tomographic monitoring  
Surface seismic sources are used to simulate crosswell data between the two wells, and, using surface receivers, reflection seismic data are obtained over the region between the two wells....
6882938 Method for separating seismic signals from two or more distinct sources  
A method is disclosed for separating energy resulting from actuating at least two different seismic energy sources from seismic signals. The sources are actuated to provide a variable time delay...
6856575 Monitoring a microseismic event  
A method of monitoring a microseismic event includes detecting the event to produce a first signal dependent on the event. The first signal includes noise at a frequency of, for example 50 Hz. A...
6836448 System and method for seismic wavefield separation  
A system and method of creating a filter for use with locally dense seismic data is disclosed. The method includes obtaining survey geometry characteristics from a locally dense seismic survey. A...
6791899 Acoustic logging apparatus and method for anisotropic earth formations  
The patent discloses a signal processing technique for determining the fast and slow shear wave polarizations, and their orientation, for acoustic waves in an anisotropic earth formation. The...
6763305 Subsurface illumination, a hybrid wave equation-ray-tracing method  
A method for improving illumination analysis in seismic data having steps of: selecting a model of the medium, a source and a receiver, a reflecting surface, finding a reflection point and the...
6757217 Method for time-aligning multiple offset seismic data volumes  
Near-offset and far-offset seismic data volumes are time-aligned by first selecting a plurality of time shifts. The near-offset and far-offset seismic data volumes are cross-correlated at the...
6681185 Method of seismic signal processing  
A method of seismic analysis is disclosed for determining geopressures or seismic velocities or other formation attributes. A frequency related attribute is determined from seismic data by...
6674688 Method and system of acquiring seismic data in an area having periodic acoustic interference  
A seismic data acquisition method and system are shown. The method acquires seismic data using an acoustic source capable of producing a seismic signal and an acoustic receiver in an area having...
6665117 Method and apparatus for interactive curved surface borehole interpretation and visualization  
An enlarged computer graphic image of borehole data is displayed on a concave three-dimensional surface, preferably a semi-cylindrical shape. Thus providing an enlarged image of a borehole surface...
6631783 Mapping reservoir characteristics using earth's nonlinearity as a seismic attribute  
This invention relates to mapping the hydrocarbon reservoir characteristics by mapping the reservoir formations that display dynamic elastic nonlinearity responses to the seismic signals. The main...
6612398 Methods for measurement, analysis and assessment of ground structure  
For determination of the laminar structure and other characteristics of a ground, oscillation sensors for detecting the vertical component or vertical and horizontal components of oscillations are...
6598001 Method of analyzing acquired signals for automatic location thereon of at least one significant instant  
A method for automatic analysis of signals acquired by one or more elastic or acoustic wave pickups to automatically locate with high precision, at least one significant instant such as the time...

Matches 201 - 250 out of 430 < 1 2 3 4 5 6 7 8 9 >