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The AAPG/Datapages Combined Publications Database
Showing 33,054 Results. Searched 195,354 documents.
Wide-Angle Seismic-Reflection and -Refraction Data from the Solomon Islands
A. K. Cooper, R. A. Wood
Circum Pacific Council Publications
... (squares; Furumoto et al, 1970). The dots show the location of sonobuoys. WIDE-ANGLE SEISMIC DATA 45 F i g u r e 3. Example of sonobuoy record collected...
1986
Web-Based Technologies for Real-time Directional Survey Quality Improvement
Jarrod S. DeVerse, Stefan Maus
Unconventional Resources Technology Conference (URTEC)
... and to gain a better understanding of how the various errors may actually impact the wellbore position. Finally, single-station QC tests...
2016
Enhanced Wellbore Placement Accuracy Using Geomagnetic In-Field Referencing and Multi-Station Correction
Stefan Maus, Matthew Herzl, Shawn DeVerse
Unconventional Resources Technology Conference (URTEC)
... to perpendicular than in the Eagle Ford well. As this angle approaches 90°, the effect on the measured azimuth is maximized. These examples show that the effect...
2015
Using Multiple Downhole VSP Arrays for Monitoring and Locating Passive Microseisms in the Oil Reservoirs; #41561 (2015)
Zuolin Chen
Search and Discovery.com
... the horizontal and vertical distributions of the one-standard location errors on four horizontal cross sections for depth levels of 0, 20, 40 and 60 m...
2015
Abstract: Tilt-Depth Method: A Simple Depth-Estimation Method Using First Order Magnetic Derivatives, by James D. Fairhead, Ahmed Salem, and Simon Williams; #90082 (2008)
Search and Discovery.com
2008
Accuracy of Determination of Relative Gravity by Torsion Balance
Donald C. Barton
AAPG Bulletin
... of a considerable number of factors. It arises: (a) from all instrumental errors in the determination of the crude gradient at the station, (b) from...
1932
Geodetic Baselines Across the Gulf of California Using the Global Positioning System: Chapter 24: Part IV. Satellite Geodesy
T. H. Dixon, D. M. Tralli, G. Blewitt, J. P. Dauphin
AAPG Special Volumes
... simultaneously, a number of errors in a single station-single satellite observable are common and may be cancelled or greatly reduced in subsequent...
1991
Application of the Global Positioning System to PNG Petroleum Exploration
N. C. Talbot, G. J. Carman
Papua New Guinea (PNG) Petroleum Convention Proceedings
... reduction scheme as follows. Pseudo-range processing is used to refine the esti mates of the station co-ordinates in the WGS84 system and errors...
1990
Abstract: Seismic Array Response in the Presence of Intra-Array Variations in Element Weights, Elevations, and Positions; #90319 (2018)
Ryan Adhi Putra, Abdullatif Al-Shuhail
Search and Discovery.com
... case are 0 dB for 0° incidence angle and -45 dB for 45° and 90° incidence angles. Effects of errors were modeled using zero-mean Gaussian random errors...
2018
Using Reflected Phases to Improve Depth Resolution of Microseismic Source Locations from Single-Well Observations
James Rutledge, Nobukazu Soma
Unconventional Resources Technology Conference (URTEC)
... event and the i1-th station, and m-th master event and the i2-th station. When the estimated microseismic source location is a true position, equation (8...
2013
Heat Flow and Tectonics in the Western Ross Sea, Antarctica
D. K. Blackman, R. P. Von Herzen, L. A. Lawver
Circum Pacific Council Publications
... study. Instru mental errors are generally negligible. Electrical plug leakage occurred at the beginning of station 6 and resulted in the only...
1987
Handling Environmental Effects on Triaxial Induction Tools
Tom Barber, Steve Bonner, Tracy Broussard, Sophia Davydycheva, Dean Homan, Gerald Minerbo, Richard Rosthal, and Hanming Wang
Search and Discovery.com
... resistivity far from the location of the tool, making it very difficult to correct. Understanding the physics of this effect has allowed us...
2015
Abstract: Post-processing Technique to Relocate Microseismic Events Using the Double-Difference Method; #90187 (2014)
Fernando Castellanos and Mirko van der Baan
Search and Discovery.com
... is usually 1-D and cannot exactly represent the true velocities of the Earth (Pavlis, 1992). To reduce the effect of these errors, we apply a post-processing...
2014
Control and Adjustment of Surveys with the Magnetometer or the Torsion Balance
Donald C. Barton
AAPG Bulletin
... of residual error is present in practically every observation with a magnetometer or a torsion balance. Errors of some types can be avoided, or greatly...
1929
Abstract: High-Accuracy Relative Event Locations using a Combined Multiplet Analysis and the Double-Difference Inversion; #90174 (2014)
Fernando Castellanos and Mirko van der Baan
Search and Discovery.com
...: Presented at the CSEG Annual Convention. Pavlis, G., 1992, Appraising relative earthquake location errors: Bulletin of the Seismological Society of America...
2014
Better Accuracy from Sidescan Records: The Object-Chord Method
Malcolm James, P. M. Tong
Geological Society of Malaysia (GSM)
... both the feathering angle and layback errors and in certain circumstances, due to good field practices, eliminates them, resulting in more accurate...
1988
Relation of Deformational Fractures in Sedimentary Rocks to Regional and Local Structure
John F. Harris , Garvin L. Taylor , Jack L. Walper
AAPG Bulletin
.... The general form used in the investigation follows. Station Number_____ Formation_______ Location Strike of beds_____ Dip of Beds_____ Lithologic...
1960
Brunton Compass Attachment for Measurement of Horizontal Magnetic Intensity
John H. Wilson
AAPG Bulletin
.... The auxiliary magnet arm makes an angle of 120° (measured in a clockwise direction) from the north index of the compass box. In End_Page 1391...
1931
What is Horizontal Resolution?
L. R. Denham, R. E. Sheriff
Indonesian Petroleum Association
.... BLACKBURN, G., 1980, Errors in stacking velocity – true velocity conversion over complex situations: Geophysics v. 45 pp. 1405-1488. GARDNER, G.H.F....
1981
A Profile of Structural Gravity Survey on the North Sturgeon Lake Field
W. F. Stackler
CSPG Bulletin
... have only minor effects on the Bouguer maps. With half a mile station spacing, or more, several of the reef structures give no indication at all...
1959
Integration of Geological Data on Seismic Sections: GEOLOGICAL NOTES
L. F. Ivanhoe
AAPG Bulletin
... on the diagram. Such "geometric errors" are proportional to the angle of cross dip, depth, and method of plotting sections (straight ray, curved ray, et cetera...
1956
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
... by the combination of these errors on a 12-element equally-weighted geophone array with various elements’ spacing and wavelet incidence angle. The effects...
2018
Bouguer Gravity Data and a North South Gravity and Magnetic Profile from the Wiseman Area, Brooks Range, Alaska
D. T. Smith, D. B. Stone, J. T. Dillon
Pacific Section SEPM
... to the relative maximum of the local gravity anomaly in the east (fig. 3). This location has perhaps the best available east-west station control...
1987
How distinctive are flood-triggered turbidity currents?
Catharina J. Heerema, Matthieu J.B. Cartigny, Ricardo Silva Jacinto, Stephen M. Simmons, Ronan Apprioual, Peter J. Talling
Journal of Sedimentary Research (SEPM)
..., and an Aquadopp RCM at 35 masf recording at 30 min intervals (Fig. 1C). Station VE was deployed at 518 mwd, at a location 5.7 km from Napoleon III (Fig. 1A...
2022
The effects of seismic anisotropy on mining seismology
Andrew King
Petroleum Exploration Society of Australia (PESA)
... impact on the geotechnical interpretation. Figure 3. The effect on event location of using an isotropic (left) versus an anisotropic (right) velocity...
2019