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公开(公告)号：US20240184007A1
公开(公告)日：2024-06-06
申请号：US18048769
申请日：2022-10-21
CPC分类号： G01V1/362 , G01V1/282 , G01V1/306 , G01V1/345 , G01V2210/584
摘要： A method may include obtaining seismic data based on a seismic survey regarding a geological region of interest. The method may further include obtaining grid data based on the geological region of interest. The method may further includes determining various travel times using the seismic data, the grid data, an Eikonal function, and a velocity model for the geological region of interest. The method may further include determining various attenuated travel times using the travel times, the grid data, and a forward modeling function that includes various gradient components. The method may further include determining various updated attenuated travel times using the attenuated travel times, the grid data, the forward modeling function, and a fast sweeping method. The method may further include generating an attenuation model of the geological region of interest using the updated attenuated travel times.
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公开(公告)号：US20240159930A1
公开(公告)日：2024-05-16
申请号：US18503846
申请日：2023-11-07
发明人： Hu JIN
CPC分类号： G01V1/282 , G01V1/303 , G01V1/362 , G01V2210/512 , G01V2210/614 , G01V2210/6222 , G01V2210/667 , G01V2210/67
摘要： A method for implementing a full waveform inversion (FWI) process using angle gathers includes; receiving observed seismic data associated with a subsurface region and captured by one or more seismic receivers, constructing based on the observed seismic data, a scalar velocity model and one or more vector velocity model partitions, where the one or more vector velocity model partitions correspond to one or more unique seismic angles. The method further includes determining one or more vector gradients using the scalar velocity model and the observed seismic data, and updating the one or more vector velocity model partitions using the one or more vector gradients. Additionally, the method also includes determining residual data by comparing synthetic data produced by the scalar velocity model with the observed seismic data, migrating the residual data backwards through time to determine one or more vector gradients, and determining the one or more unique seismic angles as the residual data is migrated backwards through time.
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公开(公告)号：US11933930B2
公开(公告)日：2024-03-19
申请号：US17185369
申请日：2021-02-25
CPC分类号： G01V1/50 , G01V1/303 , G01V1/362 , G06T3/0068 , G06T3/0093 , G06T7/20 , G06T7/337 , G01V2210/52 , G06T2207/20024
摘要： A method is described that includes obtaining a multicomponent seismic data set for a subterranean region of interest and determining, using a computer processor, a PP stacked time-domain seismic image and a PS stacked time-domain seismic image from the multicomponent seismic data set. The method further includes transforming a recording-time axis of at least one of the PP stacked time-domain seismic image and the PS stacked time-domain seismic image to produce a pair of coarsely-registered PP and PS seismic images and filtering at least one of the pair to produce a pair of spectrally-matched PP and PS seismic images. Further, the method includes dynamically warping at least one of the pair of spectrally-matched PP and PS seismic images to produce a pair of fully-registered PP and PS seismic images.
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公开(公告)号：US20230213670A1
公开(公告)日：2023-07-06
申请号：US17646966
申请日：2022-01-04
发明人： Yi Luo , Tong Wang Fei , Mohammed Mubarak , Ali Ameen Almomin , Yi He
CPC分类号： G01V1/301 , G01V1/362 , G01V2210/21 , G01V2210/322 , G01V2210/1212
摘要： A method and apparatus of locating subsurface geohazards in a geographical area that includes: receiving a plurality of seismic trace signals in the geographical area based on a shot gather from a seismic shot source; isolating and stacking the plurality of seismic trace signals to generate a windowed trace signal associated with refraction traces from the seismic shot source; transforming the windowed trace signal to a frequency domain; calculating a low frequency to high frequency ratio for the transformed trace signal; outputting the calculated ratio to a two-dimensional array representing the geographical area at a source location and at a mean receiver location; repeating the steps for a plurality of other shot gathers in the geographical area; and multiplying each source location ratio with one or more mean receiver location ratios on the two-dimensional array to generate a final frequency ratio map.
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公开(公告)号：US09989660B2
公开(公告)日：2018-06-05
申请号：US14728086
申请日：2015-06-02
申请人： PGS Geophysical AS
发明人： Jyoti Kumar , Guilherme Jangelme
CPC分类号： G01V1/362 , G01V1/303 , G01V2210/532 , G01V2210/6222
摘要： At least some of the example embodiments are methods including: performing Normal MoveOut (NMO) correction on a first Common Depth Point (CDP) gather, the NMO correction based on a reference velocity of sound in water, the NMO correction creates first NMO data with a plurality of traces; selecting a first estimated velocity that makes travel time represented in the traces substantially the same; calculating a zero-offset time shift that represents a difference in travel time as between the reference velocity and the first estimated velocity at a zero-offset trace; performing NMO correction on the first CDP gather based on a final estimated velocity to create second NMO data; adding the zero-offset time shift to each trace of the second NMO data; and then performing reverse NMO correction on the second NMO data to create corrected data.
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公开(公告)号：US20180038976A1
公开(公告)日：2018-02-08
申请号：US15229669
申请日：2016-08-05
发明人： Mamadou Sanou Diallo
IPC分类号： G01V1/36
CPC分类号： G01V1/362 , G01V1/364 , G01V2210/53
摘要： Methods for correcting seismic signals by determining a signature of an outcropping geobody (e.g., a sand dune) from unprocessed seismic data, attenuating the seismic data using a variable gap deconvolution, and performing a surface consistent deconvolution and amplitude correction on the seismic data. A signature associated with the outcropping geobody and corresponding to the geometry of the geobody may be identified from the unprocessed seismic data. The signature may be used in subsequent processing, such for the determination of a variable gap length for a variable gap deconvolution applied to the seismic data. Computer-readable media and systems for correcting seismic signals are also provided.
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公开(公告)号：US20170299745A1
公开(公告)日：2017-10-19
申请号：US15508957
申请日：2015-10-16
发明人： Byoung Yeop Kim , Joong Moo Byun , Soon Jee Seol , Ho Young Lee
CPC分类号： G01V1/362 , G01V1/28 , G01V1/282 , G01V1/286 , G01V1/30 , G01V1/32 , G01V2210/51 , G01V2210/512 , G06T11/00
摘要： The present invention relates to a one-way wave equation prestack depth migration method using an elastic generalized-screen (EGS) wave propagator capable of efficiently expressing the movement of an elastic wave passing through a mutual mode conversion between a P-wave and an S-wave while propagating boundary surfaces of an underground medium, by expanding, to an elastic wave equation, a conventional scalar generalized-screen (SGS) technique capable of quickly calculating the propagation of a wave in a medium in which there is a horizontal speed change, and according to the present invention, provided is a prestack EGS migration method for seismic wave multi-component data, which: can calculate a wave field with higher accuracy in a medium having a complex structure by expanding up to a second term of a Taylor series expansion of a vertical slowness term of a propagator; includes a mode separation operator in the propagator so as to directly use a shot gather as a migration input, without the need to separate multi-component data into a P-wave and an S-wave, enabling P-wave and S-wave image sections to be generated; and is configured to improve the quality of an S-wave migration image by correcting a polarity conversion in a wave number-frequency domain prior to S-wave imaging.
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公开(公告)号：US20170269246A1
公开(公告)日：2017-09-21
申请号：US15427688
申请日：2017-02-08
CPC分类号： G01V1/362 , G01V1/282 , G01V1/288 , G01V1/366 , G01V1/38 , G01V1/3808 , G01V2210/1212 , G01V2210/1293 , G01V2210/1423 , G01V2210/24 , G01V2210/52 , G01V2210/56 , G01V2210/59
摘要： A method for obtaining zero-offset and near zero offset seismic data from a marine survey, with separation of direct arrival information and reflectivity information, the method including: modeling a direct arrival estimate at a passive near-field hydrophone array by using a notional source separation on active near-field hydrophone data; generating reflection data for the passive near-field hydrophone array by subtraction of the modeled direct wave from data recorded by the passive near-field hydrophone array; generating near zero-offset reflectivity traces by stacking the reflection data for the passive near-field hydrophone array on a string-by-string basis or on a combination of strings basis; generating reflectivity information at the active near-field hydrophone array by subtracting the direct arrival estimate modeled using the notional source separation from the active near-field hydrophone data; and generating an estimate of zero-offset reflectivity traces by calculating a cross-correlation between the between the reflectivity information at the active near-field hydrophone array and the near zero-offset traces and performing an optimized stacking with summation weights based on coefficients of the cross-correlation.
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公开(公告)号：US20170248720A1
公开(公告)日：2017-08-31
申请号：US15441657
申请日：2017-02-24
CPC分类号： G01V1/362 , G01V1/38 , G01V1/3808 , G01V1/3835 , G01V2210/1423 , G01V2210/56
摘要： Embodiments of dynamic gain adjustments in seismic surveys are described. One method of acquiring a seismic survey includes determining an arrival time at a seismic receiver of a downgoing seismic wavefield associated with a seismic source based at least in part on an estimated position of the seismic source, an estimated position of the seismic receiver, or combinations thereof. The method also includes adjusting a gain of the seismic receiver based at least in part on the determined arrival time of the downgoing seismic wavefield in order to, for example, help prevent overdriving or clipping of the seismic receiver when the downgoing seismic wavefield arrives at or passes by the seismic receiver.
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公开(公告)号：US20170176616A1
公开(公告)日：2017-06-22
申请号：US14975997
申请日：2015-12-21
申请人： CHEVRON U.S.A. INC.
发明人： Yonghe Sun , Guojian Shan , Yue Wang , Craig Alan Barker
CPC分类号： G01V1/306 , G01V1/362 , G01V2210/51 , G01V2210/514
摘要： A method is described for seismic imaging of the subsurface using dip-guided optimized stacking. The method computes weighting functions for a plurality of single-shot migrated images, unstacked seismic images, or partially stacked seismic images based on a slant stack performed using an input dip dataset; applying the plurality of weighting functions to the plurality of single-shot migrated images, unstacked seismic images, or partially stacked seismic images, or a plurality of dip-filtered images to create a plurality of weighted images; and summing the plurality of weighted images into a stacked seismic image. The method may be executed by a computer system.
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