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Factors affecting velocity estimates

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Proceedings Papers

Paper presented at the 1991 SEG Annual Meeting, November 10–14, 1991
Paper Number: SEG-1991-0123
... it is difficult to treat with anisotropy strictly in tomography, it is practical in this par- ticular case to assume the horizontal layers which have elllpti- cal velocity dependencies. I will take two steps to remove the anisotropy effects from t,he tomogram. The first step is estimating the anisotropy factors...
Proceedings Papers

Publisher: Society of Exploration Geophysicists
Paper presented at the SEG/AAPG International Meeting for Applied Geoscience & Energy, August 28–September 1, 2022
Paper Number: SEG-2022-3747058
.... This process is often complicated by distortion of waveforms caused by frequency dependent attenuation and velocity dispersion. These difficulties can be overcome by using viscoelastic inversion of ultrasonic waveforms, which estimates velocities and attenuation factors of P and S waves by minimizing...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427591
... in reservoir characterization. upgoing primary reflection. Zhao et al. (2014) realized that the serious overlapping of direct downgoing waves and Introduction reflected waves affects Q estimation, and estimated Q and velocity by using the Gauss-Newton method from direct The attenuation of subsurface media...
Proceedings Papers

Paper presented at the SPE Russian Petroleum Technology Conference, October 26–29, 2020
Paper Number: SPE-202027-MS
... gathers (CIG). For this reason, such approach does not fit the uncertainty analysis of the structural plan in terms of depth-velocity model. However, we should note that such approach can be used to estimate the non-uniqueness of the seismic horizon correlation, since this factor can also lead...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2966031
... because of their high signal to noise ratio. Our simple modelling shows, as expected, that the main parameters (maximum offset, Q factor, layer depth, velocity) affecting the attenuation of the seismic waves along their ray-path significantly distort the attenuation properties of stacked traces. We...
Proceedings Papers

Paper presented at the International Petroleum Technology Conference, February 21–23, 2022
Paper Number: IPTC-22242-EA
... of horizontal well and optimum completion scheme are critical factors in the success of horizontal wells. Pressure drop along the horizontal section might affect the production profile in exceptionally high flow rate wells. Estimating pressure drop in horizontal wells is not straightforward. The first...
Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-1870
... at the well. Very often, this process is embedded in another exercise: wavelet estimation for seismic reservoir characterisation, because both processes are so closely related. Many factors can affect the correctness and the quality of seismic to well tying, e.g.: 1- Seismic noise (processing artefacts...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-0683
... physics model. The example of s-wave velocity estimation shows the solid grain shape is an important factor that can affect the velocities of tight rocks. Page 2933SEG Denver 2014 Annual Meeting DOI httpdx.doi.org/10.1190/segam2014-0683.1© 2014 SEG A new rock physics model for tight reservoirs Figure 6...
Proceedings Papers

Paper presented at the SPE Russian Petroleum Technology Conference, October 22–24, 2019
Paper Number: SPE-196934-MS
.... In these conditions high velocity variations are present in the subsurface, however the main issue of the given paper is another significant factor – change of stratigraphic patterns in the cross-section, which affects the interferential seismic response and may have a significant impact on the seismic interpretation...
Proceedings Papers

Paper presented at the SPE/IADC Managed Pressure Drilling and Underbalanced Operations Conference and Exhibition, April 17–18, 2018
Paper Number: SPE-190008-MS
... the separator must exceed the liquid velocity downward in the separator to provide a 100% separator cut for preventing a blow-through condition. MacDougall (1990) proposes a 500ft/hr or 8.4ft/min gas migration rate based on work done on understanding factors that affect bubble rise velocity of gas kicks...
Proceedings Papers

Paper presented at the OTC Brasil, October 24–26, 2017
Paper Number: OTC-28063-MS
...) Varipig 1 21:02 Varipig 2 21:08 Varipig 3 20:59 The simulation result is shown in Figure 3. Figure 3 Pig velocity profile for the Varipigs. The travel time estimated was 25 hours and 30 minutes, therefore 4,5h longer than the real pigging. The porcupine pig was lauched after these three Varipíg...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-W6-03
... the necessity to build and calibrate a 3-D velocity model for hypocenter location, nor determination of accurate absolute origin times. This method also implicitly accounts for factors that are often ill-constrained for most velocity models, e.g. velocity anisotropy, since these factors similarly affect both...
Proceedings Papers

Paper presented at the International Petroleum Technology Conference, November 21–23, 2005
Paper Number: IPTC-10392-MS
... in the factors influencing the area affected by oil fallout, such as the blowout rate, which is reflected in an even larger uncertainty in the estimate of this area. ƒ Due to lack of calibration of fallout models, little is known about the quality of the prediction of these models. Calibration of the fallout...
Proceedings Papers

Paper presented at the 2012 SEG Annual Meeting, November 4–9, 2012
Paper Number: SEG-2012-1220
... of frequency bandwidth and wavelet distortion. There are a number of factors affecting the stretch of events in depth, such as reflection angle, structure dip and local velocity. With some geometry analysis, migration stretch is related to incident angle, which suggests that working in common angle domain...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2995402
..., as only one perturbation type occurs at a time. The additional errors associated with simultaneous perturbations of r and V/V are shown in Figures 4c and d. We see that estimates of source perturbation are barely affected by the presence of a velocity perturbation: the stretching method of CWI removes...
Proceedings Papers

Paper presented at the 2010 SEG Annual Meeting, October 17–22, 2010
Paper Number: SEG-2010-2452
... in permeability. Introduction Velocity and resistivity of rocks depend on porosity, texture, mineralogy, and pore fluid. Studies by Wyllie et al. (1956, 1958) showed that porosity is the primary factor affecting P- and S- wave velocities. Later studies (Nur and Simmons, 1969; Domenico, 1976; Mavko, 1980...
Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-2919
... of migration was to get structural information about the subsurface geology. Now imaging the true reflectivity of the subsurface has attracted wide attention in the seismic exploration industry. This requires correct treatment of the factors affecting the amplitude of waves during the extrapolation and imaging...
Proceedings Papers

Paper presented at the SEG/AAPG/SEPM First International Meeting for Applied Geoscience & Energy, September 26–October 1, 2021
Paper Number: SEG-2021-3594953
... et al., 2007). However, little permeability. These results can be helpful to estimate grain attention was given to the role of grain size in affecting wave size from wave velocities, using well logs and seismic data. velocities in consolidated rocks. Over the years, we have used a rock physics model...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2996009
..., whereas porosity could also affect velocity change (Katahara, 2017). With the background set by the VTI described above, we assume that the strain deformation in the overburden is 10.1190/segam2018-2996009.1 Page 5359 © 2018 SEG SEG International Exposition and 88th Annual Meeting R factors estimation...
Proceedings Papers

Paper presented at the 2016 SEG International Exposition and Annual Meeting, October 16–21, 2016
Paper Number: SEG-2016-13947419
...Pore structure prediction for tight sandstone and verification with X-CT Wei Xian* Research institute of petroleum exploration & development Summary The pore shape significantly affects the elastic properties of the rock. Therefore, this factor must be considered when estimating the elastic moduli...

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