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Showing 31,251 Results. Searched 196,367 documents.
Abstract: Modelling Near-field Effects in VSP-based Q-estimation Part 2: Modelling Results; #90171 (2013)
Arnim B. Haase and Robert R. Stewart
Search and Discovery.com
... dependence on frequency in the far-field but not in depth regions where the near-field becomes significant. Near-field effects are one possible...
2013
Abstract: Modelling Near-field Effects in VSP-based Q-estimation Part 1: Theoretical Developments; #90171 (2013)
Arnim B. Haase and Robert R. Stewart
Search and Discovery.com
... The near-field of a P-wave point source decays faster with distance from the source than the far-field (1/z2 versus 1/z). It also decays with frequency...
2013
Value of marine vibrators for effective frequency-dependent spatial sampling of seismic wavefield
Arash JafarGandomi, Aparajita Nath, Sergio Grion
International Meeting for Applied Geoscience and Energy (IMAGE)
... can then be used to construct a robust and accurate estimate of the far-field signature of the source. The basic method of signature estimation...
2023
Spherical Wave Model Tests of VSP-Based Q-Estimation Techniques
Search and Discovery.com
... functions, spherical spreading is included. Also modelled are near-field and far-field effects. The Density Change Model The parameters for this earth model...
2013
Broadband Seismic Technology and Beyond: Part VI: Towards a Ghost-Free Solution
Lasse Amundsen, Martin Landrø, Eivind Frømyr
GEO ExPro Magazine
... conventional source arrays have a radiation pattern the emitted wave-field directed into the earth. At least one suband are far from being isotropic...
2013
Recommendations From Error Analysis of Single Well Microseismic Data With Full-Wavefield Moment Tensor Inversion: A Case Study
Juan M. Lorenzo, Trudy L. Watkins, Arash Dahi Taleghani
Unconventional Resources Technology Conference (URTEC)
...field amplitudes with distinguishable P- and S-wave terms. The far-field amplitudes are what are mostly observed in earthquake data with large source- ...
2017
Reservoir Description by Interferometric Imaging of VSP Data in Transition Zones
Thomas Radford, Martin Karrenbach, Ferry Yustiana, Willi Brianno, Dhea Wachju
Indonesian Petroleum Association
... large variability in data quality due to strong variations in near surface effects. Widely changing source coupling and radiation patterns create...
2013
Application of Precise Acoustic Positioning Techniques During the Development of the Liuhua Field in the South China Sea
John D. Hughes, Nigel C. Kelland
Southeast Asia Petroleum Exploration Society (SEAPEX)
... mechanical releases and ground weights, was used by Racal Positioning and Survey to install and position the Near Field transponders. The Far Field array...
1996
Appendix A: Considerations for Optimum 3-D Survey Design, Acquisition and Processing
R. Malcolm Lansley
AAPG Special Volumes
... source signature may be estimated deterministically from near-field pressure measurements in the vicinity of each of the individual air guns within...
2011
Acquisition Footprint, by Andreas Cordsen, #40128 (2004).
Search and Discovery.com
2004
Marine Seismic Sources: Part I: Air-Guns for Non Experts
Lasse Amundsen, Martin Landrø
GEO ExPro Magazine
...-bubble ratio is PBR=P/B. The far-field signature (lower trace) shows the effect that the source ghost has on the near-field signature. The peak...
2010
Broadband data with a new low frequency source Acquisition and processing example from the Gulf-of-Mexico
Xuefeng Shang, Maksym Kryvohuz, Hamish Macintyre, Guido Baeten, Thibaut Allemand, Philippe Herrmann, Stephane Laroche, Shuki Ronen
International Meeting for Applied Geoscience and Energy (IMAGE)
... of the source and the near field hydrophones was in the order of 5-10 m. For airgun array data, the far field source signature can be determined using near...
2023
Modeling of Near-Wellbore Hydraulic Fracture Complexity
Christopher Sherman, Joseph Morris, Scott Johnson, Alexei A. Savitski
Unconventional Resources Technology Conference (URTEC)
...’ orientations under the influence of near-field stress concentrations, propagate outwards and turn towards their ideal orientations under the far-field...
2015
Case Study: Using Acoustically Derived Completion Data, Machine Learning, and Economics to Evaluate Completion Effectiveness in the Bakken
Josh Kroschel, Muhammad Khan, Nathan Crawford
Unconventional Resources Technology Conference (URTEC)
... half-length multiplied by height, and near field connectivity index (NFCI). Once the objective is defined, the optimum is realized at the point...
2024
Inference of Induced Fracture Geometries Using Fiber-Optic Distributed Strain Sensing in Hydraulic Fracture Test Site 2
Stephen Bourne, Kees Hindriks, Alexei A. Savitski, Gustavo A. Ugueto, Magdalena Wojtaszek
Unconventional Resources Technology Conference (URTEC)
...l, ℒ, is the elastostatic strain field at 𝐱 due to a unit, point source, 𝑎 is the opening-mode dislocation at 𝐱 𝑓 on fracture surface, 𝑆. For a homogeneou...
2021
ABSTRACT: Regional Effects of the Cuban Arc-Continent Collision on Structure, Stratigraphy and Hydrocarbons in the Deepwater, Southeastern Gulf of Mexico, by Mann, Paul; Yang, Wenxiu ; Escalona, Alejandro; #90142 (2012)
Search and Discovery.com
2012
A Prototype Near-Field GIS Model to Characterize Acute Risks of Sequestered CO2 Release Through Orphan Wells
Kenneth T. Bogen, Frank J. Gouveia, Lee A. Neher, Steven G. Homann
AAPG Special Volumes
...A Prototype Near-Field GIS Model to Characterize Acute Risks of Sequestered CO2 Release Through Orphan Wells Kenneth T. Bogen, Frank J. Gouveia, Lee...
2009
Specialized processing of a massive distributed acoustic sensing (DAS) 3D VSP in a producing well
Ali Sayed, Francesca Twynam, Ran Bachrach, Philippe Caprioli, Marcus Holloway, Qingsong Li, Reetam Biswas, Daniel Tebo, Sam Buist
International Meeting for Applied Geoscience and Energy (IMAGE)
... Angular far-field source signatures are computed for a suite of take-off angles and azimuths from the near-field hydrophone recording with nominal ...
2023
Q Marine
PESA Staff
Petroleum Exploration Society of Australia (PESA)
... pressure and array geometry. The far-field signature of a source array can be measured using a far• field hydrophone, suspended some hundreds...
2000
Reflection Seismogram in a Solid Layered Earth: ABSTRACT
Milo M. Backus, Filho Nepomuceno, Jingzhong Cao
AAPG Bulletin
... angle can be very significant. Replacement of the plane wave normal incidence synthetic seismogram with the point source solid earth synthetic...
1983
Deblending seismic data using multistage iterative source separation with priors A case study using streamer 3D data
Wilson Ibanez-Jacome, Jarred Hostetler, Rajiv Kumar, Wouter Gerrit Brouwer, Saeeda Hydal, Yousif Izzeldin Kamil Amin
International Meeting for Applied Geoscience and Energy (IMAGE)
... sources. Both records include interference from far and near sources. Figure 4-b displays the near (left) and far (right) source records after...
2023
Fine-Sediment Deposition from Gravity Surges on Uniform Slopes
W. Brian Dade, John R. Lister, Herbert E. Huppert
Journal of Sedimentary Research (SEPM)
.... If this condition is not met, then there is strong interaction between fluid entrainment and sediment deposition in the near field. Consequently, the far-field...
1994
A Sound Exposure Level (SEL) Study for a 3D Seismic Survey off the WA Coastline, Browse Basin
Andrew S. Long, Jens F. Wisløff, Jaafar Ali, Averrouz Mostavan, David Hedgeland, Alec J. Duncan, Amos L. Maggi, Jeremy Colman
Petroleum Exploration Society of Australia (PESA)
... of likely received SELin the near-field and far• several years. The purpose of this panel was Factors that influence the amount ofTS include fie ld...
2011
Displacement Geometry in the Volume Containing a Single Normal Fault
Jim A. M. Barnett , John Mortimer , John H. Rippon , John J. Walsh , Juan Watterson
AAPG Bulletin
.... Displacement associated with a fault can be regarded as consisting of two separate components: near-field and far-field. The near-field component...
1987