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...

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...

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...

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...

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

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...

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...

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...

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...

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...

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...

Seismic monitoring using compact phased arrays: CO2 sequestration monitoring

Jian Zhang, Elige B. Grant, Paul A. Nyffenegger, Mark A. Tinker, Kevin D. Hutchenson, Don C. Lawton

International Meeting for Applied Geoscience and Energy (IMAGE)

... will no doubt reduce error ellipses, the effect on the location accuracy is more difficult to ascertain without using ground truth events. The validated events...

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...

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...

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...

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...

Resolving DAS versus geophone discrepancies using the DAS transform: A comparative study from the CaMI CCS field research station, Alberta

Ali Sayed, Robert R. Stewart, Marie Macquet, Don Lawton

International Meeting for Applied Geoscience and Energy (IMAGE)

...Resolving DAS versus geophone discrepancies using the DAS transform: A comparative study from the CaMI CCS field research station, Alberta Ali Sayed...

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...

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...

Time-lapse attenuation variations during CO2 injection using DAS VSP data from the CaMI Field Research Station, Alberta, Canada

Yichuan Wang, Donald C. Lawton

International Meeting for Applied Geoscience and Energy (IMAGE)

...Time-lapse attenuation variations during CO2 injection using DAS VSP data from the CaMI Field Research Station, Alberta, Canada Yichuan Wang, Donald...

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...

Optimized downward continuation for the one-way wave equation in TTI media

Cosmin Macesanu, Faqi Liu

International Meeting for Applied Geoscience and Energy (IMAGE)

... to the low order of the Pad´ e polynomials (and will vary with the polar angle θ ). Generally the errors are larger at large polar angles...

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...

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....

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...