1-20 of 27056 Search Results for

Time-domain operations

Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2985006
... velocity-stress seismic wave equation in vertical time domain. This feature has a more profound effect on the areas with large speed differences, especially in the mid-deep high-speed areas. Besides, we deduce the difference formula of the approximate source wavefield using the optimization operator, and...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3426296
... store the whole time-dependent wavefields in time-domain FWI. The widely used recomputation strategy leads to computationally intensive tasks. In this work, we propose an affordable parsimonious alternative to compute such Hessian-vector product, thanks to a Fourier-domain compression and a “full...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427569
... Time-domain and frequency-domain electromagnetic (EM) data can contain supplementary information. The joint inversion of them improves the quality of the inversion result and provides a good basis for further geological interpretation. However, finding a unified model that explains both data...
Proceedings Papers

Paper presented at the International Petroleum Technology Conference, March 26–28, 2013
Paper Number: IPTC-16881-MS
... scalability and the memory demand of the lower-upper decomposition of the forward-problem operator. We implement the direct-solver and the time-domain modeling approaches in 3D acoustic frequency-domain FWI, which is applied to real 3D wide-azimuth OBC data from the Valhall field, North Sea, at low...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, September 15–20, 2019
Paper Number: SEG-2019-3209074
.... We present a viscoacoustic least-squares reverse-time migration (LSRTM) based on a time-domain complex-valued wave equation. According to the Born approximation, we first linearize the viscoacoustic wave equation and derive a demigration operator. Then, using the complex valued Lagrange multiplier...
Proceedings Papers

Paper presented at the SPE/IADC International Drilling Conference and Exhibition, March 8–12, 2021
Paper Number: SPE-204071-MS
... penetration is not increased enough. However, if they are over estimated, the torsional oscillations can reach the bent motor, and destabilize the tool face orientation (TFO). In this paper, a full time-domain dynamics model and a simplified model coupled with a stiff-string torque and drag model are used to...
Proceedings Papers

Paper presented at the The 30th International Ocean and Polar Engineering Conference, October 11–16, 2020
Paper Number: ISOPE-I-20-4256
... the legs were thus accounted for by a Morison approach in the calculation of the required response amplitude operators. This paper presents the calculation of the vessel's seakeeping behaviour in irregular waves in time domain on the basis of these modified RAOs. The applied method calculates the...
Proceedings Papers

Paper presented at the The 27th International Ocean and Polar Engineering Conference, June 25–30, 2017
Paper Number: ISOPE-I-17-495
... ABSTRACT This paper presents an air gap calculation for semi-submersibles using both frequency domain and time domain methods. In the frequency domain calculations, wave frequency motion, low frequency motion, static heel and setdown, and wave crest amplification are all considered. The low...
Proceedings Papers

Paper presented at the Abu Dhabi International Petroleum Exhibition & Conference, November 9–12, 2020
Paper Number: SPE-202725-MS
... applicable for battery/memory operations Various downhole logging tools that implement the PEC time-domain techniques have been reported over the past decade ( Rourke et al. 2013 , Rourke et al. 2014 , Macki et al. 2017 , Zhang et al. 2013 , Jawed et al. 2019 , Dutta and Olaiya 2020 ). The...
Proceedings Papers

Paper presented at the Abu Dhabi International Petroleum Exhibition & Conference, November 9–12, 2020
Paper Number: SPE-202725-MS
..., high power requirements suitable for SRO Lower power applicable for battery/memory operations Various downhole logging tools that implement the PEC time-domain techniques have been reported over the past decade ( Rourke et al. 2013 , Rourke et al. 2014 , Macki et al. 2017 , Zhang et al...
Proceedings Papers

Paper presented at the The Nineteenth International Offshore and Polar Engineering Conference, July 21–26, 2009
Paper Number: ISOPE-I-09-170
...Direct Time Domain Downtime Assessment for LNG Operations using Computer Cluster J.J. de Wilde, A.W. van Dijk , J. van den Berg and J. Dekker Maritime Research Institute Netherlands (MARIN) Wageningen, The Netherlands ABSTRACT Time domain simulations are used extensively to assess the availability...
Journal Articles
Journal of Ship Research 65 (02): 123–138.
Paper Number: SNAME-JSR-04180019
Published: 30 June 2021
...Yan Dong; Yordan Garbatov; Carlos Guedes Soares Fatigue strength assessment of a butt-welded joint in ship structures based on a time-domain strain approach is performed in this study. The service life load histories applied to the butt-welded joint located on the deck of a bulk carrier are...
Proceedings Papers

Paper presented at the SPE Asia Pacific Oil & Gas Conference and Exhibition, November 17–19, 2020
Paper Number: SPE-202454-MS
... production logging frequency multi-sensor time-domain electromagnetic measurement eddy current coil current density evaluation quantitative evaluation sensor investigation eddy current density long sensor Pipe corrosion is a major cause of well integrity problems and therefore poses a huge...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2995915
... ABSTRACT In this study, we develop a gradient-based multiscale method in the time domain. Our time-shift method provides a natural and efficient way to realize multiscale inversion. Data preprocessing is not needed; instead, a time-shift cross-correlation is performed multiple times to extract...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3426967
... into the Technical Program but was not presented at the 2020 SEG Annual Meeting. reservoir characterization image-domain least-square reverse-time migration exploration geophysicist 10 regularization artificial intelligence migration seg international exposition artifact synthetic data...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3418614
... equation simulation hilbert transform fourier integral method operator The constant Q theory describes in frequency domain that the seismic wave amplitude attenuation linearly increases with respect to frequencies. We present a simple generalized time-domain wave equation to precisely simulate...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5897069
... is an acoustic impedance volume corrected for illumination effects. This paper presents the results of a field data example with the objective of comparing the results of the time domain inversion and the depth domain inversion, identifying and explaining both differences and similarities. This...
Proceedings Papers

Paper presented at the The 29th International Ocean and Polar Engineering Conference, June 16–21, 2019
Paper Number: ISOPE-I-19-134
... drilling riser operation time domain riser marine riser fatigue life wave-induced fatigue analysis upstream oil & gas offshore engineering coefficient matrix Analysis on the Wave-induced Fatigue Analysis of Marine Drilling Riser Based on the Time Domain Method Yanbin Wang, Deli Gao and...
Proceedings Papers

Paper presented at the The Fourteenth ISOPE Pacific/Asia Offshore Mechanics Symposium, November 22–25, 2020
Paper Number: ISOPE-P-20-178
... ABSTRACT A time-domain method is developed for modeling the dynamics of a floating truss-structure wind turbine with multiple rotors mounted on the deck of the platform. In its hydrodynamic aspect, a hybrid panel-stick model is built up incorporating the potential flow theory to evaluate the...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3416118
... seg international exposition operator radon transform erratic noise basis function algorithm upstream oil & gas snr radon coefficient matching pursuit algorithm offset inner product Lp-space Robust Matching Pursuit algorithm for time-domain Radon-based deblending Ji Li, University of...

Product(s) added to cart

Close Modal