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The AAPG/Datapages Combined Publications Database
Showing 154 Results. Searched 200,357 documents.
Abstract: Time-varying Wavelet Estimation and Deconvolution; #90171 (2013)
Mirko van der Baan
Search and Discovery.com
... for enhanced robustness, while (3) ensuring that the amplitude at the Nyquist frequency remains zero. This procedure leads to a symmetric, zero-phase wavelet...
2013
Abstract: Lamb Waves Recorded in Microseismic Monitoring Wellbores; #90174 (2014)
Andy St-Onge
Search and Discovery.com
... were sampled at rates as low as 0.25 msec, which is equivalent to a Nyquist frequency of 2000 Hz. Signal data observed by MIC contains frequencies...
2014
Abstracts: Revisiting Homomorphic Wavelet Estimation and Phase Unwrapping; #90173 (2015)
Roberto H. Herrera and Mirko van der Baan
Search and Discovery.com
... phase due to the time shifting, except near the Nyquist frequency due to lack of signal. Finally we tested the performance of these algorithms...
2015
Abstract: Reflectivity Color Correction in Gabor Deconvolution; #90211 (2015)
Carlos Montana and Gary Margrave
Search and Discovery.com
... are noise in the seismic data, inaccuracies in the sonic log recording process, and the difference between the seismic Nyquist frequency...
2015
Fracture and Deformation Band Visualization Using Full-Resolution 3D Ground Penetrating Radar (GPR) in Cretaceous Carbonates, #40499 (2010)
Mark Grasmueck, Gregor P. Eberli, Pierpaolo Marchesini, Miquel Coll, Rizky P. Sekti, Juliette Lamarche, Brita Graham Wall, Paul Gillespie
Search and Discovery.com
... is quarter-wavelength as spatial sampling. EQUIPMENT AND ACQUISITION METHOD 1 3 2 A) Centimeter Positioning of the antenna Nyquist criterion...
2010
Data Enhancement from a 486-Channel Streamer
Bill Dragoset, Ken Larner
Pacific Section of AAPG
... the Nyquist frequency. Whereas the coherence levels in the two figures are comparable at late times (below about 2.5 sec), the coherence levels for the beam...
1980
Advances in Geophysical Techniques for the Detection of Drilling Hazards and Their Application to Seismic Exploration
D. C. N. Pratt, Tong Pow Mun
Southeast Asia Petroleum Exploration Society (SEAPEX)
... equations. “Geophysics”, V 50, pp 609–614. 5. Taner, M.T., and Sheriff, R.E., 1977, Application of Amplitude, Frequency and Other Attributes...
1990
Magnetic Spectrum of the San Kampaeng Geothermal Area, Northern Thailand
Somsri Sertsrivanit, Charn Tantisukrit, Surachai Praserdvigai
Geological Society of Malaysia (GSM)
... to the highest frequency or nyquist frequency at 0.005 cycle/metre. In Figure 3, the high amplitude energy spectrum is TO TAL Fig. 4. M A G N E T IC F...
1986
Velocity estimation via model order reduction
Alexander V. Mamonov, Liliana Borcea, Josselin Garnier, Jrn Zimmerling
International Meeting for Applied Geoscience and Energy (IMAGE)
... according to the Nyquist sampling rate for the essential frequency of f (t) (the largest frequency in the interval outside of which f (ω) is small). Using...
2022
Characterization and simulation of transverse noise waves of a multisensor solid streamer
Viktor Smirnov, A. Sourice, J. Ribette, J. Mars, P. Herrmann
International Meeting for Applied Geoscience and Energy (IMAGE)
... spectrum. The angle and frequency dependent reflection of the seismic wavefield at the water-air interface causes destructive interference...
2022
Compressive sensing framework using the linear radon transform for 3D ultrasonic data reconstruction in a pinch-out reservoir model
Pedro C. de Assis, Romulo B. da Silva, Irineu A. Lima Neto, Alan C. Galante, Alexandre L. Campi, Alessandro R. de Oliveira, Roseane M. Missagia, Marco A. R. Ceia
International Meeting for Applied Geoscience and Energy (IMAGE)
... are relatively well-understood. Some improvements in the recovery of pre-stack seismic data sampled below the Nyquist criterion were shown by Hennenfent...
2022
Improved Understanding and Interpretability Beneath the Complex Accretionary Section in West Timor, Indonesia, Via Marine Broadband Seismic and Beam Depth Migration
Mazin Farouki, Felice D'Alterio, Erika Gentile
Indonesian Petroleum Association
... the receiver ghost and associated ghost frequency notches via wavefield separation of the recorded data into its component up-going and down-going wavefields...
2012
Nonuniform dispersed source arrays for broadband seismic acquisition
Joaqun A. Acedo, Mauricio D. Sacchi
International Meeting for Applied Geoscience and Energy (IMAGE)
... in the acquisition stage. Consequently, when acquiring broadband data, specially designed sources release coherent energy in a pre-defined frequency range...
2023
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)
... and decimated to 33.4 ft [10 m] in space and 4 ms in time. The spatial decimation was optimized to align the gauge length notch with the spatial Nyquist...
2023
Monitoring Hydraulic Fracturing Operations Using Fiber-Optic Distributed Acoustic Sensing
Kevin Boone, Roger Crickmore, Zabi Werdeg, Carson Laing, Mathieu Molenaar
Unconventional Resources Technology Conference (URTEC)
... would not operate properly. The maximum frequency f at which laser pulses can be transmitted is given by f=2c/nL , where c is the speed of light, n...
2015
The contribution of recent developments in signal processing technology and geological constraints to the reimaging of narrow-azimuth streamer data in the north-eastern Gulf of Mexico
Hongyan Li, Jarred Hostetler, Nadxieli De La Rosa Perez, Hugo Enrique Munoz Cuenca, Zhao Ge, Wilson Ibanez, Courtney Steichen, Ruoyu Gu, Jarrod Hutson, Michiru Tomida
International Meeting for Applied Geoscience and Energy (IMAGE)
..., but to Nyquist frequency at a 4-ms sample rate. A previous raytracing study (Espinoza et. al, 2017) indicated that the maximum aperture to model salt-related...
2023
Induced polarization chargeability calibration standards
John E. E. Kingman, Terry J. Ritchie, Peter Rowston*
Petroleum Exploration Society of Australia (PESA)
... as a moving average or FIR digital filter. Filters with multiple gain zeros (notches) at the sampling Nyquist frequency serve best in this regard. For example...
2019
Efficient lossy compression of seismic wavefields via GPU-based Tucker decomposition
Yongjie Tang, Wei Zhang, Wu Wang, Tao Lei
International Meeting for Applied Geoscience and Energy (IMAGE)
... in spatial and temporal compression are satisfied with the Nyquist-Shannon theorem in all test cases. Figure 3 shows the comparison of computation time...
2024
Effect of near offset seismic data in shallow subsurface modeling using full-waveform inversion
Md Iftekhar Alam, Salman Abbasi
International Meeting for Applied Geoscience and Energy (IMAGE)
... data volume on the resolution for FWI models is observed. Nyquist frequency and Fresnel zone are often discussed when it comes to the data resolution...
2024
A New Insight of Hydrocarbon Potential in Stratigraphic Trap in the Keutapang Formation, North Sumatra Basin
Argya Hastubrata Basundara, Andi Mardianza, Humbang Purba, Ricky Andrian Tampubolon, Shidqi Anugrah Diria, Dedi Retno Haryanto, Herman Darman, Junita Trivanty
Indonesian Petroleum Association
... spectrum with the signal utilising only a fraction of the available bandwidth up to the Nyquist. High-frequency enhancements aim to sharpen the data...
2018
Geophysical Characterization of the Shallow Subsurface at a Contaminated Site in Calcasieu Parish, Louisiana
Keri B. Judice, Carl Richter, William H. Schramm, Catherine E. Bishop, Timothy W. Duex
GCAGS Transactions
..., 120 p. Doll, W. E., T. J. Gamey, J. E. Nyquist, W. Mandell, D. Groom, and S. Rohdewald, 2001, Evaluation of new geophysical tools for investigation...
2006
Cambrian Shoreline Deposits in Northern Michigan
Charles A. Haddox, R. H. Dott, Jr.
Journal of Sedimentary Research (SEPM)
... of South Australia: Jour. Sed. Petrology, v. 49, p. 1229-1244. NYQUIST, J. E., AND WANG, H. F., 1988, Flexural modeling of the midcontinent rift: Jour...
1990
Abstract: Black Box Recording of Passive Seismicity: Pitfalls of not Understanding your Acquisition Instrumentation and its Limitations; #90187 (2014)
Ted Urbancic and Andreas Wuestefeld
Search and Discovery.com
... recording system yields an undistorted picture of ground motion from 15Hz to the Nyquist frequency as imposed by the digitizer or the high-frequency...
2014
Abstract: Wide Azimuth Interpolation; #90211 (2015)
Daniel Trad, Jeff Deere, and Scott Cheadle
Search and Discovery.com
... assumptions can be made using a priori information. For example, since interpolation uses the very reasonable constraint that frequencies beyond Nyquist...
2015
Seismic Acquisition Optimization for Exploration in Thrust Belts and Foreland Basins; #42268 (2018)
Pedro Muñoz, Juan Uribe, Nestor Sanabria
Search and Discovery.com
... the impact of topography and source paramaters in record amplitudes and frequency bandwith. These differences make it difficult to make a comparison...
2018