Acoustic nonlinear full-waveform inversion on an outcrop-based detailed geological and petrophysical model (Book Cliffs, Utah)

Daria Tetyukhina, Stefan M. Luthi, Dries Gisolf

AAPG Bulletin

... effects in the data. Random noise added to the data is rejected by the nonlinear inversion, contributing to improved spatial resolution. The results show...

Clays and Clay Minerals of the Santa Ana River Drainage Basin, California

G. M. McMurtry, Pow-Foong Fan

Journal of Sedimentary Research (SEPM)

.... These factors are the mass absorption coefficient ratios of the phases in question to quartz for the optical slit system used. Background and random noise were...

Abstract: Milankovitch Climate Cyclicity and its Effect on Relative Sea Level Changes and Organic Carbon Storage, Late Cretaceous Black Shales of Colombia and Venezuela, by T. Villamil and E. G. Kauffman; #90988 (1993).

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Assessing Textural Variation in Laminated Sands Using Digital Image Analysis of Thin Sections: RESEARCH METHODS

Elmer H. van den Berg, Victor F. Bense, Wolfgang Schlager

Journal of Sedimentary Research (SEPM)

... elementary area (REA). A too small window introduces random noise in the measured values, a feature known as inadequate sample support (Anguy et al...

The Rise and Fall of a Cratonic Arch: A Regional Seismic Perspective on the Peace River Arch, Alberta

David W. Eaton, Gerald M. Ross, Jacqueline Hope

CSPG Bulletin

... (60, compared with typical values of 10 - 30), providing unusually good attenuation of random noise. In addition, the Lithoprobe data were acquired...

Enso and Sunspot Cycles in Varved Eocene Oil Shales from Image Analysis

Maurizio Ripepe , Lillian T. Roberts , Alfred G. Fischer

Journal of Sedimentary Research (SEPM)

... in 25-year increments, showed generally random distribution of varve thickness, except in a 400-year s gment which yielded two prominent peaks, one at 5.4...

How to Make Good Decisions … Examples From Exploration

Bernhard W. Seubert

Indonesian Petroleum Association

... by Howard and Danbom, Conoco) showed seismic panels generated from purely random noise (Figure 2) to an interpreter who was not aware of the random nature...

Spatial Sampling Bias in Decision Tree Machine Learning Method for Unconventional Resources

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Imaging in Complex Environments … Common Reflection Angle Migration

Graham A. Winbow

Indonesian Petroleum Association

... “sweeps”, if uneven illumination is not properly compensated there will be signal/noise problems above target reflectors due to incorrect interference...

Spatial Patterns of Sediment Accumulation on a Holocene Carbonate Tidal Flat, Northwest Andros Island, Bahamas

Eugene C. Rankey

Journal of Sedimentary Research (SEPM)

... sized subenvironments. Ancient successions that include random patterns may reflect the more pronounced influence of forces external to the sedimentary...

What samples must seismic interpreters label for efficient machine learning?

Ryan Benkert, Mohit Prabhushankar, Ghassan AlRegib

International Meeting for Applied Geoscience and Energy (IMAGE)

... Learning for Attention Sensitivity or ATLAS in short. EXPERIMENTS Experimental Setup For our active learning experiments, we select two random sections...

Spatial Variability of Porosity in Chalk: Comparison of an Outcrop and a North Sea Reservoir

P. Frykman

AAPG Special Volumes

...% of the total variance in the vertical data set. The nugget effect is the expression of very fine-scale random variations in porosity. These variations...

The practice of graphical fluid-gradient interpretations of formation tester pressure data

Andrew Chen

AAPG Bulletin

... phenomena. For example, fluid gradient changes could be because of data acquisition errors and “noise,” the coexistence of several fluids, fluid contacts...

Exorcising the Ghosts … The New Streamer Technology Launched by PGS

Lasse Amundsen, Martin Landrø

GEO ExPro Magazine

... the seismic data susceptible to swell noise. On the other hand, deep towing of streamers enhances the low frequencies, but attenuates the high...

Prospect Investigation and De-Risking Using Cognitive Interpretation Workflows, Offshore Equatorial Guinea; #42170 (2017)

Tom Wooltorton, Stephen Leslie, Merritt Smith, Ryan M. Williams, Luis Gomez

Search and Discovery.com

.... ▪ The delivered migrated cubes used Kirchhoff pre-stack time migration, interpolated at 12.5 x 12.5m. ▪ Additional gather conditioning and noise reduction...

G. Non-Normal Incidence Reflections and the Determination of Lithology - Use of Shear Waves and Amplitude with Offset

Norman S. Neidell

AAPG Special Volumes

.... 485-502, 1961. End_Page 52------------------------- (14) Koefoed (O.), "On the Effect of Poisson's Ratio of Rock Strata on the Reflection...

Wireline Log Response, Petrography and Reservoir Properties of Cored Intervals: Kugmallit Sequence (Oligocene), Beaufort-Mackenzie Basin, Arctic Canada

F.W. Nentwich, R.W. Yole

CSPG Bulletin

... present. Consequently, total sandstone thickness for such intervals would be overestimated. The effect of random statistical variations in the gamma-ray...

Optimized characterization workflow for naturally fractured reservoirs using seismic anisotropy attributes in the Middle Magdalena Valley basin, Colombia

Oscar Moreno, Enrique Casaña, Luis Figuera, Iván Higuera, Diego García, Jorge Acosta, Benjamin Roure

International Meeting for Applied Geoscience and Energy (IMAGE)

... to azimuthal NMO correction for velocity anisotropy estimation, COCA gathers were random noise filtered applying radon transform to each azimuth...

Using Multiazimuth Seismic Data for Anisotropy Estimation in an Unconventional Reservoir

Surabhi Mishra

Petroleum Exploration Society of Australia (PESA)

... and azimuth. The original data acquisition is designed to record high folds and high Signal to noise (S/N) ratio. When measured, the anisotropy can yield...

Stress State Derived from Microseismicity Induced by Hydraulic Fracturing: Downhole and Surface Monitoring

Zuzana Jechumtálová, František Stanĕk, Leo Eisner, G.Randy Keller

Unconventional Resources Technology Conference (URTEC)

...ts can result from an effect of noise in data (automatically picked amplitudes) and consider the mechanisms to be mostly shear analogous...

Petroleum generation kinetics: Single versus multiple heating-ramp open-system pyrolysis: Reply

K. E. Peters, A. K. Burnham, and C. C. Walters

AAPG Bulletin

.... 29, p. 2987–2997. Nordeng, S. H., 2015, Compensating for the compensation effect using simulated and experimental kinetics from the Bakken and Red...

Abstracts: CO2 Rock Physics: A Laboratory Study; #90173 (2015)

Helen Yam and Douglas R. Schmitt

Search and Discovery.com

... traces to reduce random noise effects. From the final waveforms the transit time of the signals can be deduced, and with the length of the sample...

Abstract: Least Squares Pre-Stack Time Migration for Imaging and Reconstruction of Converted Waves; #90224 (2015)

Aaron Stanton

Search and Discovery.com

... Summary Converted waves suffer from a low signal to noise ratio and stronger aliasing than P-waves. These characteristics are problematic when...

4-D Seismic: A Powerful New Technology for Monitoring Steam Movements in Duri Field-Central Sumatra

S. D. Jenkins, M. F. Bee, J. H. Lyle, E. Murhantoro

Indonesian Petroleum Association

... the outer radius (100 m) of the high pressure annulus shows the effect of pressure drawdown on producing wells. Later surveys show pressure increases...

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)

...source frequency of 125 Hz: 3) isotropic medium with dominant source frequency of 125 Hz and 5% random Gaussian noise added to the seismograms 4) ...