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Steep-dip implicit methods

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Proceedings Papers

Paper presented at the 2009 SEG Annual Meeting, October 25–30, 2009
Paper Number: SEG-2009-3005
...) scheme to an implicit Fourier finite-differences (FFD) algorithm (Ristow and Ruhl, 1994). The resulting solution accurately handles steep dips in inhomogeneous TTI media. In this paper we explore the accuracy of different approximations to the TTI dispersion relation. The rational function expansions can...
Proceedings Papers

Paper presented at the SPE Reservoir Characterisation and Simulation Conference and Exhibition, May 8–10, 2017
Paper Number: SPE-186079-MS
... a simple diapir model where radial and tangential faults would be expected. The very steep fault dips and small throws also suggest a strike-slip origin for the faults. According to Johnson et al. (2005 ), deformation in on- and offshore UAE was controlled by inversion of basement faults, leading...
Proceedings Papers

Paper presented at the 2006 SEG Annual Meeting, October 1–6, 2006
Paper Number: SEG-2006-2367
... nite-difference, the 4th order optimized nite-difference improves the steeply dipping salt ank and the falt. CONCLUSION I present an implicit nite-difference migration method for VTI me- dia. The scheme is designed by approximating the dispersion relation with rational functions and solving the coef...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-2412
... with large velocity contrasts and steep dips. Impulse responses show that the presented method reduces the azimuthal anisotropy at almost no extra cost. Introduction Fourier finite-difference (FFD) method (Ristow and Rühl, 1994) can handle complex media with large velocity contrasts and steep dips...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5915894
... implies that we can afford a 70Hz one-way migration at almost the same cost as a 40Hz RTM! Many times this extra resolution provided by a one-way method delivers more value than a two-way propagator that accurately images the steep dips or multiply scattered energy. With the help of a case study, we...
Proceedings Papers

Paper presented at the 1998 SEG Annual Meeting, September 13–18, 1998
Paper Number: SEG-1998-1124
... explicit filters can be designed (Hale, 1990b), and McClellan filters provide an effi- cient implementation (Hale, 1990a). However, unlike implicit meth- ods, stability can never be guaranteed if there are lateral variations in velocity (Etgen, 1994). Additionally, accuracy at steep dips requires long...
Proceedings Papers

Paper presented at the 1997 SEG Annual Meeting, November 2–7, 1997
Paper Number: SEG-1997-1699
... a modified version of the Muir- Claerbout operator for the isotropic case (Claerbout, 1985). In the second scheme for the general case of VTI, the coefficients of the single operators have been optimized. In any case special attention has been given to the design of steep-dip migration operators...
Proceedings Papers

Paper presented at the 1995 SEG Annual Meeting, October 8–13, 1995
Paper Number: SEG-1995-1220
... directions such that the steep dip problem and the problem of numerical anisotropy will be solved. = . Recently Cary (1993) numerically investigated a (5) v way splitting 3-D implicit FD method. The relative error is defined by Our work extends the idea of Lee and Suh (1985) from two dimensions to three...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-1417
... the full wave equation have become the state of the art in modern exploration seismology. They provide the benefits of more accurate imaging in complex geological scenarios with steep dips and overhangs, multipathing and complex overburden. However, imaging methods based on modeling with the full wave...
Proceedings Papers

Paper presented at the Offshore Technology Conference Asia, March 20–23, 2018
Paper Number: OTC-28241-MS
... model are used to monitor how LSRTM can improve the imaging of dip reflectors, steep dips and the pinch-out. The LSRTM method succeeded to image the flanks, remove noises and improve the resolution. Inversion process of least squares RTM was more efficient than conventional RTM to enhance the resolution...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-2295
... operators in the wavenumber-frequency (k-f) domain. This choice has advantages of operator stability and accurate steep dip behavior. The main drawback, compared to x-f migration, is that lateral variations in the medium are not naturally accommodated by k-f domain operators. For isotropic migration, a...
Proceedings Papers

Paper presented at the 2015 SEG Annual Meeting, October 18–23, 2015
Paper Number: SEG-2015-5900751
... carbonates can exhibit highly heterogeneous velocities and shape, thereby acting as a fast and variable "lens" resulting in distortions of the seismic image. In addition, the top of carbonates may also be quite rugose, steep dip, and complex in shape, adding to the complexities of the propagating wavefield...
Proceedings Papers

Paper presented at the 2008 SEG Annual Meeting, November 9–14, 2008
Paper Number: SEG-2008-2236
... Summary Gaussian beam prestack depth migration (GB-PSDM) represents an excellent tool for the migration of seismic data in complex velocity fields, as it is an implicit multiarrival migration algorithm. With the turning waves feature, it is also appropriate for imaging of steep dips...
Proceedings Papers

Paper presented at the 2002 SEG Annual Meeting, October 6–11, 2002
Paper Number: SEG-2002-1308
... of strong-contrast dipping struc- tures on imaging performance, we design a steep salt model shown in Figure 3. It presents some features challenging migra- tion methods. The most challenging difficulty is the sharp inter- faces on the sides of the salt body where the lower steep interface is a...
Proceedings Papers

Paper presented at the SPE Reservoir Simulation Symposium, February 18–20, 2013
Paper Number: SPE-163633-MS
... plan-view ( x-y ) and 100-1 in cross-section ( x-z or y-z ). The spatial resolution of the grid dictates the spatial resolution of all subsequent modelling steps. Each grid cell is assigned a unique facies code, typically using one of a number of geostatistical methods, such as sequential...
Proceedings Papers

Paper presented at the 2000 SEG Annual Meeting, August 6–11, 2000
Paper Number: SEG-2000-0802
... Summary To accurately image complex structures with strong lateral velocity variations and steep dips, we develop a globally optimized Fourier finite-difference method that uses a rational approximation of the square-root operator in the one-way wave equation. The method uses a split-step...
Proceedings Papers

Paper presented at the 2010 SEG Annual Meeting, October 17–22, 2010
Paper Number: SEG-2010-3140
... inline delayed-shot migration procedure in 3D tilted elliptical-cylindrical (TEC) coordinate systems. When inline coordinate tilt angles are well-matched to the inline source ray parameters, the TEC coordinate ex- tension affords accurate propagation of both steep-dip and turning-wave components...
Proceedings Papers

Paper presented at the Abu Dhabi International Petroleum Exhibition & Conference, November 13–16, 2017
Paper Number: SPE-188878-MS
... structure is an E-W-oriented asymmetric low-relief anticline, with dip ranging from 1°/2° degrees in the west, to almost 4° in the east. Two major subperpendicular fault sets, striking NW-SE and NE-SW, cross the entire reservoir; these are steep (>80°) and long (up to 10 km) with relative small throw...
Journal Articles
Journal: SPE Journal
SPE Journal (2021)
Paper Number: SPE-205382-PA
Published: 06 April 2021
...Dongqi Ji; Shuhong Wu; Baohua Wang; Zhiping Li; Fengpeng Lai; Zhangxin Chen; Mingzhe Dong; Chenqi Ge Summary Temperature-dependent irreducible water saturation has great implications for heavy-oil production. Especially in processes using thermal methods, the irreducible water saturation varies...
Journal Articles
Journal: SPE Journal
SPE Journal (2021)
Paper Number: SPE-198999-PA
Published: 19 February 2021
... positive linear trend with pressure. Therefore, diffusion coefficients should follow a much less steep linear trend before minimum miscibility pressure. The value of the diffusion coefficient is rather insignificant in this case, and diffusion cannot be treated as a main CO 2 EOR mechanism. A steep linear...

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