VSP – The Link Between Geology and Geophysics, by Ronald C. Hinds and Richard Kuzmiski, #40552 (2002).

Search and Discovery.com

Recent Advances in Borehole Seismic

W. L. Nutt

Indonesian Petroleum Association

... of the data will change as the velocity of the formation changes. To avoid recording tube waves and casing arrivals in vertical raypath VSP it is essential...

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

David W. Bell

AAPG Special Volumes

...) dip effects; (C) effect of DMO. TWT = two-way traveltime. End_Page 197------------------------   however, constant-velocity DMO does...

Diving wave tomography: Velocity modelling using first arrival traveltime

Amatul Syafi Abdul Basit, Abdul Rahim Md Arshad, Arulini Permalu

Geological Society of Malaysia (GSM)

... with velocity are the push-down and pull-up effect caused by the discrepancy between recorded traveltime and the actual depth of the structure. It often...

Pre- and Post-Injection Vertical Seismic Profiling over the Southwest Regional Partnerships Phase II Fruitland Coal CO2 Pilot; #80104 (2010)

Tom Wilson, Les Nutt, Ric Smith, Jitendra Gulati, Marcia Coueslan, Dwight Peters, Art Wells, Craig Hartline, George Koperna, Bill Akwari

Search and Discovery.com

... zone velocity; and, determine the potential for time lapse AVO observations in CMP and VSP records. Zero offset VSP first arrival times provided aTD...

Practical Use of Borehole Seismic in Exploration; Goals and Shortcomings

F. Sandnes, L. Nustt, S. G. Henry

Indonesian Petroleum Association

... to difficulties in processing as the Alias frequency of the data will change as the velocity in the formation changes. To improve signal to the downhole signal...

Vertical Seismic Profiling in Hydrocarbon Exploration and Reservoir Development

Bob A. Hardage

Circum Pacific Council Publications

.... The VSP traces plotted here represent the vertical component of the seismic displacement measured by a velocity-sensitive geophone that is locked...

Integration of Vertical Seismic, Surface Seismic, and Well-log Data at the Mallik 2L-38 Gas-hydrate Research Well, Mackenzie Delta, Canada

M. W. Lee, T. S. Collett, W. F. Agena

AAPG Special Volumes

... the result of the traveltime inversion of the VSP data to infer seismic anisotropy, but it was not possible to conduct a more detailed analysis...

ABSTRACT: Gas Hydrate Detection Using VSP Data and its Correlation with Dell Log Data; #90118 (2011)

Indresh Kumar

Search and Discovery.com

... concentration of gas can decrease velocity substantially. Partial replacement of pore fluid by hydrate does not change the density much, so the impedance...

VSP: Lessons from Numerical Simulation

M. Suprajitno, S. A. Greenhalgh

Indonesian Petroleum Association

... of VSP The VSP entails shooting into a geophone spread down a borehole (Gal' perin, 1974). in effect, conventional seismic profiling is turned through 90...

Using Multiple Downhole VSP Arrays for Monitoring and Locating Passive Microseisms in the Oil Reservoirs; #41561 (2015)

Zuolin Chen

Search and Discovery.com

.... There is no significant change of the patterns within the range of the vertical aperture of the VSP wells. Outside the frame, errors increase gradually...

Abstract: Feasibility Testing of Time-lapse Seismic Monitoring with Full Waveform Tomography; #90171 (2013)

Chad Hogan, Ken Hedlin, Gary Margrave, and Michael Lamoureux

Search and Discovery.com

... to detect and reveal the extent of these effects, both spatially and in terms of the magnitude of the effect on the velocity. Our early investigations...

Effective Use of High Density VSP Measurements to Predict Pore Pressure and Estimate Mud Weight Ahead of Drilling in the Mahakam Delta, Indonesia

Mohammed Badri, Stephane Gazet, Gregoire de Tonnac

Indonesian Petroleum Association

... top of overpressure zone. To address this challenge, VSP method was used in accurately estimating seismic velocity to determine depth to overpressure...

VSP Lookahead of the Bit Information: Considerations and Accuracy Analysis, #42196 (2018).

P. Ranjan, M. Khaitan, S. Chandrasekhar, Basant Kumar

Search and Discovery.com

... was performed in intermediate runs. Sonic log as well as VSP data were then acquired in successive run. VSP Lookahead derived velocity profile (ahead...

Vertical Seismic Profiling--A Measurement that Transfers Geology to Geophysics: Chapter 2

B. A. Hardage

AAPG Special Volumes

... in VSP data will be emphasized later. The field geometry in Figure 4 is similar to that used when recording velocity check-shot data. However...

Abstract: Attenuation, Velocity Dispersion and the Fate of the Vibroseis Signal; #90211 (2015)

Bernd Milkereit, Flora Sun, Wei Qian, and Thomas Bohlen

Search and Discovery.com

... velocity dispersion caused by attenuation will have a detrimental effect on conventional Vibroseis correlation processes. In seismic survey areas...

Application of finite difference eikonal solver for traveltime computation in forward modeling and migration

Amir Mustaqim Majdi, Seyed Yaser Moussavi Alashloo, Nik Nur Anis Amalina Nik Mohd Hassan, Abdul Rahim Md Arshad, Abdul Halim Abdul Latiff

Geological Society of Malaysia (GSM)

... of the traveltime is shown by the simple velocity, v distance, d and time, t relationship below: v = d/t (1) Based on equation (1) above, velocity of a moving...

Amplitude Mapping of Reservoirs in North Africa

Search and Discovery.com

... is to have the quarter wavelength resonance frequency within the band limit of the seismic data. A 20m thick reservoir with a 4000m/s sand velocity would...

Shallow VSP for Near-Surface Structure and Statics, #41535 (2015).

Soo-Kyung Miong, Robert R. Stewart, Joe Wong

Search and Discovery.com

... vertical seismic profiling (VSP) data can serve as a near-surface characterization tool-providing velocity values for static corrections and reflection...

Depth Prediction Ahead of the Bit: A Case Study from the Singa-1 Discovery Well, South Sumatra

Mark Crawley, David Ginger

Indonesian Petroleum Association

... in the recorded wavefield can then be processed in the same way as a standard VSP. Whilst drilling, velocity information was provided in time-depth pairs...

Anisotropy analysis from 3D VSP surveys acquired at Otway site

Sofya Popik, Andrej Bona, Roman Pevzner

Petroleum Exploration Society of Australia (PESA)

... as a source. Seismic image significantly depends on the quality of velocity model used for imaging. In cases when anisotropy is present, its effect cannot...

Chapter Ten-part 2: Depth Conversion

Leslie R. Denham, Dave K. Agarwal

AAPG Special Volumes

... reflection is recorded from a horizontal reflector, and the earth above the reflector (the overburden) has a uniform P-wave velocity V, the traveltime...

Seismic Technologies for Unconventional Reservoir Characterization: Wamsutter Field Case Study; #110159 (2011)

Rosemarie Geetan, Brian Hornby, Ricko Wardhana

Search and Discovery.com

... quality & velocity control • >90% pre-plot shots acquired over 6 days 13 Well to seismic ties- VSP and surface seismic Velocity Density GR Acoustic...

Improving Depth Prediction Accuracy of Quantified Drilling Hazards

W. Scott Leaney, William H. Borland

Geological Society of Malaysia (GSM)

.... Drillers want predictions in depth, however, and the output of VSP inversion is acoustic impedance in two-way time. Thus, a velocity profile must...

Time-Lapse WAW VSP Imaging of an Unconventional Reservoir Using DAS Fiber Optics

J. Andres Chavarria, Dan Kahn, David Langton, Steve Cole, Xinyang Li

Unconventional Resources Technology Conference (URTEC)

... due to hydraulic fracturing of the rocks change the character of seismic waves. Repeatable DAS VSP measurements within the stimulated zone can reveal...