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The AAPG/Datapages Combined Publications Database

Showing 40,632 Results. Searched 188,040 documents.

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Ascending

erformance of Seismic Arrays in the Presence of Weathering Layer Variations, #41841 (2016).

Jubran Akram, Abdullatif A. Al-Shuhail

Search and Discovery.com

... as compared to the entire array length. Introduction A receiver array response is defined as the sum of outputs of the individual receivers comprising...

2016

Abstract: Array Analysis of Surface Microseismic Data from the Rolla Microseismic Experiment; #90174 (2014)

Katarina Seckarova and David W. Eaton

Search and Discovery.com

... which 30 events were analyzed to determine backazimuth and apparent velocity. This was accomplished by using a velocity analysis procedures similar...

2014

Abstract: Advantages and Disadvantages of Array Depth Placement and Longer Toolstring Apertures; #90187 (2014)

N. Verkhovtseva and J. Shaffner

Search and Discovery.com

... event (Zimmer 2010). The velocity model plays a major role in the apparent event apertures and therefore should be carefully considered when deciding...

2014

Field Technique Design for Seismic Reflection Exploration

L. R. Denham

Dallas Geological Society

... example). Such an array will attenuate all arrivals with a wavelength of 40 m. The minimum apparent velocity of a reflection in the area at the target depth...

1982

Extending the Resolution of Seismic Reflection Exploration

L. R. Denham

Pacific Section of AAPG

... an East Texas example [Figure 8]). Such an array will be 6 dB down at a wavelength of about 80 m. The minimum apparent velocity of a reflection...

1980

Data Enhancement from a 486-Channel Streamer

Bill Dragoset, Ken Larner

Pacific Section of AAPG

... frequency components. The amount of attenuation depends on the velocity distribution, array length and offset, and reflector dip and depth. Figure 5...

1980

Abstract: Microseismic Event Location Accuracy Enhancement using Anisotropic Velocity Models; #90172 (2014)

Michael Jones, Richard Parker, Shawn Maxwell

Search and Discovery.com

... value of 0.12 was selected for the parameter γ, governing the shear anisotropy. Given a velocity model and a survey geometry, it is possible...

2014

Characterization of near-surface fractures for hydrogeological studies using azimuthal resistivity survey: A case history from the Mamu Formation, Enugu (Nigeria)

Ahamefula U. Utom, Benard I. Odoh, Daniel K. Amogu, Amobi C. Ekwe, Boniface C. E. Egboka

Environmental Geosciences (DEG)

... of anisotropy (Keller and Frischknecht, 1966; Habberjam, 1972), whereas the direction of maximum apparent resistivity measured by the collinear array...

2013

Seismic Array Response in the Presence of Intra-Array Variations in Element Weights, Elevations, and Positions; #42328 (2018)

Ryan Adhi Putra, Abdullatif A. Al-Shuhail

Search and Discovery.com

... indicates the delta (spike) function centered at t=0. The mathematical representation of the Ricker wavelet is given as: (2) Moreover, the array wavelet...

2018

Geological Considerations during Microseismic Monitoring, Processing, and Interpretation of Hydraulic Fracture Treatment

J. Le Calvez, S. Hanson-Hedgecock, P. Primiero, T. Al-Wadhahi, O. Harrasi

Unconventional Resources Technology Conference (URTEC)

..., are the quality of the velocity model used, understanding the survey design biases and the seismic data quality. High levels of noise, array geometry...

2016

The Effect of Velocity Uncertainty and Attenuation on Flow Estimates From Microseismicity

Oleg V. Poliannikov, Michael Fehler, Alison Malcolm

Unconventional Resources Technology Conference (URTEC)

... induced rock failure and seismic wave propagation, e.g., rock cohesion, rock friction, maximum and minimum stresses in the formation, velocity model...

2015

Seismic Imaging through Outcropping Carbonates: An Example from the Canadian Rocky Mountains, , #41533 (2015).

Yong Hua, Don C. Lawton

Search and Discovery.com

... (2015) Posted February 9, 2015 *Adapted from extended abstract prepared in conjunction with a presentation given at CSPG/CSEG 2007 GeoConvention, Calgary...

2015

Abstract: Optimum Aperture Length for Improving Dispersion Curve Analysis in CMP Cross-Correlation of Surface Waves; #90187 (2014)

Roohollah Askari, Robert J. Ferguson, and Helen Isaac

Search and Discovery.com

... is approximately equivalent to the maximum length of the observed wavelength and calculate the dispersion curve. Figure 3 shows the phase velocity. Here, we see two...

2014

Reservoir Description by Interferometric Imaging of VSP Data in Transition Zones

Thomas Radford, Martin Karrenbach, Ferry Yustiana, Willi Brianno, Dhea Wachju

Indonesian Petroleum Association

... of the curves is readily apparent, showing an initial velocity drop followed by a general increase in velocity. However, the variability at each...

2013

The Application of Velocities and Models to Seismic Interpretation

G. Jarrota

Indonesian Petroleum Association

... maximum generally indicates the seismic velocity for the corresponding time. The peak values of these amplitude curves are displayed on the right...

1977

A Comparative Study of Conventional Arrays of Resistivity Prospecting with Differential Arrays

K. K. Sharma, S. Jayashree

Geological Society of Malaysia (GSM)

... over a conducting substratum (Fig. 2). For the first case (Fig. 1) the apparent resistivity curve obtained with a dipole array differs from those...

1996

A Case for Microseismic Surface Arrays in Texas?

Hallie Meighan, Robert A. Hull, Earl Roberts

Unconventional Resources Technology Conference (URTEC)

..., the patch- and nearby downhole-array recorded the same hydraulic stimulation and their microseismic datasets confirmed the same maximum stress azimuth...

2015

First-Arrival Traveltime Inversion in the CMP Domain: Method and Application

Search and Discovery.com

..., and Zhu et al., 2000) which derives the near-surface velocity model based on traveltime reconstruction. The other approach is to map apparent velocities...

2013

AAPG Memoir 76, Chapter 18: Velocity Estimation for Pore-Pressure Prediction

David W. Bell

AAPG Special Volumes

... tectonic uplift and therefore exhibit a higher velocity for a given depth than expected from the compaction trend evident above the unconformity...

2001

Long Period Long Duration Seismic Events During Hydraulic Stimulation of a Shale Gas Reservoir, #40761 (2011)

Indrajit Das, Mark D. Zoback,

Search and Discovery.com

... the apparent velocity across the array. From apparent velocity we can get the approximate angle of arrival. 0s Lag time 0.2 s Density...

2011

Abstract: Seismic Wave Attenuation due to Scattering and Leaky Mode Mechanisms in Heterogeneous Reservoirs; #90171 (2013)

Jun-Wei Huang, Gilles Bellefleur, and Bernd Milkereit

Search and Discovery.com

... is controlled by the correlation length of the reservoir. We thus predict that the effects of leaky modes to the energy loss increase to the maximum...

2013

Abstract: Pre-survey Planning for Microseismic Monitoring Projects; #90174 (2014)

Brad Artman, Ben Witten, and Brad Birkelo

Search and Discovery.com

.... energy at any given distance of an array from the event. In the models that follow we assume the event is 2,000 ft away, a constant Q of 150, a Vp/Vs ratio...

2014

The Geophysicist Communicating with Seismic Processing

R. E. Sheriff

Southeast Asia Petroleum Exploration Society (SEAPEX)

... of structural complexity. The central two panels show the data processed according to the given velocity information, without and with muting, so that one...

1980

Microseismic Event Location Using Multiple Arrivals: Demonstration of Uncertainty Reduction

Zhishuai Zhang, James W. Rector, Michael J. Nava

Unconventional Resources Technology Conference (URTEC)

... to these microseismic events, most of the perforation shots were recorded by the geophone array and can be used for velocity model calibration...

2015

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