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7633834 |
VSP pattern recognition in absolute time
A procedure to determine VSP-WD (Vertical Seismic Profiling—While Drilling) first breaks in absolute time is described. By combining a seismic surface source and firing complex seismic pattern...
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7602669 |
Tube-wave seismic imaging
The detailed analysis of cross well seismic data for a gas reservoir in Texas revealed two newly detected seismic wave effects, recorded approximately 2000 feet above the reservoir. A tube-wave (...
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7551516 |
Vertical seismic profiling method utilizing seismic communication and synchronization
A while-drilling Vertical Seismic Profiling (VSP) data acquisition system utilizing the same seismic shots for three purposes is disclosed. First, the seismic shots provide a means for...
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7542373 |
Vector 3-component 3-dimensional kirchhoff prestack migration
An apparatus and a method for migration of three components, 3-Dimensions seismic (3-C, 3-D) data acquired by down-hole receivers and surface seismic sources. This method utilizes full 3 components...
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7535800 |
Seismic imaging and tomography using seabed energy sources
In-sea seismic energy sources, deployed at or near the seabed, generate seismic waves in earth formations beneath the seabed when activated by a triggering mechanism at a precise time synchronized...
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7529151 |
Tube-wave seismic imaging
The detailed analysis of cross well seismic data for a gas reservoir in Texas revealed two newly detected seismic wave effects, recorded approximately 2000 feet above the reservoir. A tube-wave (...
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7512034 |
Drill noise seismic data acquisition and processing methods
A method of acquiring seismic data that includes deploying a first array of seismic receivers and a second array of seismic receivers, and simultaneously receiving drill noise seismic energy...
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7508735 |
Method of analyzing vertical seismic profile data, method of producing a hydrocarbon fluid, and a computer readable medium
A P-wave slowness-polarization data set resolving P-wave slowness against P-wave polarization angle is extracted from a multi-offset vertical seismic profiling data set. A function relating P-wave...
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7508736 |
Vector migration of 1st order free-surface related downgoing multiples from VSP data
1 st order free-surface multiples recorded in VSP data or reverse VSP data are processed using a 3-C 3-D vector migration method to produce an image of the subsurface. This image produces a larger...
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7496488 |
Multi-scale finite-volume method for use in subsurface flow simulation
A multi-scale finite-volume (MSFV) method to solve elliptic problems with a plurality of spatial scales arising from single or multi-phase flows in porous media is provided. The method efficiently...
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7492664 |
Method for processing acoustic reflections in array data to image near-borehole geological structure
A method and apparatus for enhancing the moveout between a direct wave and a reflected wave. The method involves transmitting imaging signals into a body to be imaged and receiving the resulting...
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7466626 |
Seismic surveying arrangement
A seismic surveying arrangement comprises a vertical source array ( 26 ) having at least two sources ( 27,28 ) of seismic energy. The source array ( 26 ) is disposed such that a first source ( 28 )...
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7460437 |
Seismic data processing method and system for migration of seismic signals incorporating azimuthal variations in the velocity
A method and system for seismic data processing utilizes azimuthal variations in the velocity of seismic signals. The system and method utilizes a plurality of seismic energy sources that are...
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7414919 |
Method for improving the seismic resolution
A method for improving the seismic resolution in the field of petroleum exploration and development, using the steps of: (1) ensuring the depth and the velocity of the low-velocity layer and the...
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7379385 |
Processing of seismic data acquired using over/under streamers and/or over/under sources
Implementations of various techniques for processing seismic data acquired by three or more over/under streamers. In one implementation, the seismic data may be processed by grouping the seismic...
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7359284 |
Method for processing borehole seismic data
Seismic data recorded by subsurface seismic sensors placed in a borehole, such as an oil or gas well, are transformed via a process of upward wavefield propagation to pseudo-receivers at the...
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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...
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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...
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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...
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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...
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6990045 |
Methods for acquiring seismic data while tripping
A method is described for acquiring seismic data while removing, or tripping, a drill string from a wellbore. The method comprises, conveying an autonomous seismic receiver down a fluid passage in...
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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 account...
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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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6944095 |
Terrestrial seismic acquisition process and apparatus, in particular for a vertical seismic acquisition
A method for the acquisition of seismic signals, in which at least two sources of the air gun type are placed within one or more vertical holes extending in the subsoil and in which one or more...
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6944094 |
High resolution determination of seismic polar anisotropy
A method and apparatus for high-resolution measurement of seismic anisotropy, comprising: a recording system, a borehole having an axis that is deviated from the vertical by a known acute angle; a...
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6922373 |
Method of estimating relative bearing of a borehole receiver
The invention is a method for determining the orientation of a multi-component receiver where the preferred embodiment of the method makes use of an approximation of the relative bearing angle...
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6917564 |
Method of processing seismic data
A method of processing seismic data, for example surface seismic data such as multi-component OBC (Ocean Bottom Cable) seismic data, comprises using vertical seismic profile (VSP) seismic data to...
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6906981 |
Method and system for acquiring marine seismic data using multiple seismic sources
A method for seismic surveying is disclosed which includes towing a first seismic energy source and at least one seismic sensor system. A second seismic energy source is towed at a selected...
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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....
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6868037 |
Use of drill bit energy for tomographic modeling of near surface layers
A method for tomographic modeling of seismic wave travel times from well drilling records generated by drill string vibrations during drilling and identifying in the recorded vibration at least one...
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6868038 |
Seismic method of performing the time picking step
The present invention provides a method of performing the time picking step in a VSP (vertical seismic profile) survey. In a preferred embodiment of the invention the time picking step is carried...
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6747914 |
Use of minor borehole obstructions as seismic sources
An acoustic system and method for monitoring a hydrocarbon reservoir. Wellbore tube wave energy may be created by natural or ambient sources or tube waves may be excited intentionally. Wellbore...
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6748330 |
Method and apparatus for anisotropic vector plane wave decomposition for 3D vertical seismic profile data
A wavefield separation method and apparatus for 3D VSP data, which handles arbitrary 3D source and receiver geometries, and common shot 3C data oriented to North, East and Vertical geographical...
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6684159 |
Mapping subsurface open fractures in a reservoir using a surface impulse and a downhole vibratory source
A method for determining the location and the orientation of the open natural fractures in an earth formation from the interaction of the two seismic signals, one signal transmitted into the...
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6607050 |
Integrated ocean bottom towed array for four-component seismic data acquisition
An integrated ocean bottom towed four-component array for seismic data acquisition consists of a four-channel electronic section for seismic data collection, a gimbaled three-component geophone and...
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6597632 |
Mapping subsurface fractures using nonlinearity measurements
This Patent describes a method for determining the location and orientation of the open natural fractures in an earth formation by analyzing the interaction of the two seismic signals. One is a low...
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6382332 |
Drill bit apparatus for receiving seismic sound signals
A drilling rig 10 supports a drill string 11 within a borehole 12 . An acoustic receiver 14 is associated with a drill bit 13 connected to the end of the drill string 11 . An acoustic...
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6332507 |
Seismic prospecting method and device in wells allowing guided waves filtering
A VSP or reversed VSP type seismic prospecting method according to the invention allows disturbances contained in seismic recordings produced by tube waves propagating along wells and refracted in...
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6302204 |
Method of obtaining improved geophysical information about earth formations
The present invention provides a method for forming wellbores. In one method, one or more wellbores are drilled along preplanned paths based in part upon seismic surveys performed from the surface....
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6289284 |
Method of imaging the permeability and fluid content structure within sediment
A non-destructive method of measuring physical characteristics of a medium, such as uncemented sediment, sandstone, or limestone. A pseudo-random code is generated and is used to generate a...
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6208586 |
Method and apparatus for communicating data in a wellbore and for detecting the influx of gas
A transducer is described especially for use in providing acoustic transmission in a borehole. The transducer includes a multiple number of magnetic circuit gaps and electrical windings that have...
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6166994 |
Seismic detection apparatus and method
A method of seismic exploration while drilling from within a borehole containing fluid, with a source and receivers positioned in the borehole is provided, comprising detecting small amplitude...
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6151275 |
Method of dual wavefield reinforcement
A method and system of dual wavefield reinforcement or increasing the contributions to each image point in the seismic image can be accomplished by aligning the upward traveling energy, U, and the...
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6147929 |
Method for predicting continuous and discontinuous waveguide targets using interwell seismic signature characteristics
A method for planning continuity logging surveys and for detecting the presence of a continuous or discontinuous low-velocity inclusion in a subterranean geological formation. To detect the...
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6131694 |
Vertical seismic profiling in a drilling tool
A vertical seismic profiling system includes seismic receivers for placement on a drillstring and surface seismic sources. One-way checkshot data may thus be measured without tripping the...
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6091668 |
Static marine seismic system and method
A system and method for periodically providing information about subsurface formations in a marine environment using a non-towed seismic signal source (3) and a static array of seismic signal...
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6091669 |
Method of determining, displaying and using the relative changes of elastic modulus and density of underground rock
The general object of the present invention is to provide a method for determining and displaying the relative changes of elastic moduli and that of density of geologic formations and for utilizing...
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6081482 |
Semi-recursive imaging under complex velocity structures
A computationally efficient semi-recursive Kirchhoff migration algorithm is capable of obtaining accurate images of complex structures in complex geological environments which commonly give rise to...
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6049508 |
Method for seismic monitoring of an underground zone under development allowing better identification of significant events
The invention is a method for facilitating discrimination and identification of seismic or microseismic events by means of permanent pickups in an underground zone under development. The method...
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6046959 |
Sound source arrangement
A sound source arrangement for use in carrying out a seismic survey comprises flexible structural modules connected together end-to-end to form an elongated flexible structure of substantially...
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