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Search Results: 1 - 10 of 57395 matches for " 3D wave equation pre-stack depth migration "
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The Outline and General Comments about the Advance of the Resevoir Geophysics Project Implemented in Daqing Oilfield

LI You-ming,

地球物理学进展 , 2006,
Abstract: Shortly after the constitution of this project,in order to verify the feasibility of the theoretical research implementation,we proposed an additional requirement of direct involving in the production of oil and gas reservoirs in the outer part and deep part of Daqing,so that the overall merit of both theoretical research and practical application of this project can be improved.With the successful construction of PC-clusters and development of the seismic data parallel processing system plus assistant software packages in 1998,we built up the 3D wave equation pre-stack depth migration algorithm and the corresponding software in 2000,which is synchronous with international seismic exploration community.Such an achievement greatly improves the capability of seismic imaging in China.In the year of 1999,we assembled an eight-node PC-cluster and processed 150 km-long seismic profiles.In paticular,on the depth map of line 82,we clearly imaged the internal structure and fault character of an uplift in a depression area.After a rearrangement of 3D seismic exploration and with many research works,a great break through was achieved accomanying the drilling of the Xushen No.1 well and leading to the discovery of the huge gas field in Daqing.This success remarkably improves the continuable development foreground of Daqing oilfield.We have also built up two reservoir geophysics research centers in Beijing and Daqing,respectively.It has been proved that proper and reasonable research organization and activity will benefit the integration and application of the products of a great scientific project,and is key to make progress with combined efforts consecutively and efficiently.
Wave equation pre-stack depth migration with dual-complexity

LIU Qing-min,LI Zhen-chun,LI Liu-zhong,GAI Hai-peng,

地球物理学进展 , 2007,
Abstract: Increasing efforts have been made to seismic exploration in areas with irregular topography.Pre-stack depth migration with dual-complexity turns out to be a valid way to deal with irregular topography and complex geologic structures.Wave field upward continuation realizes the migration from non-horizontal field surface,solve the near surface complexity's affection on the subsurface structures.Numerical tests on theoretical model and real data processing show that the method gives approving results and can effectively combine wave equation redatuming with depth imaging.
Review of seismic illumination pre-stack depth migration methods

YANG Jing-lei,LI Zhen-chun,YE Yue-ming,PAN Ya-ting,

地球物理学进展 , 2008,
Abstract: This paper reviewed the concepts of seismic illumination pre-stack depth migration and its realizations.The seismic illumination pre-stack depth migration is a effective method and is achieved through the pre-stack depth migration of the effective illumination point source record and synthetic source record.seismic illumination pre-tack depth migration can be roughly divided into two: the plane wave migration and the beamlet migration.Theory data processing results showed that seismic illumination pre-stack depth migration methods validate the efficiency of above theory and the high-quality image of the ultimate target.
Xwfd pre-stack depth migration based on dual-complexity with error compensation correction

YE Yue-ming,LI Zhen-chun,TONG Zhao-qi,ZHANG Hui,XU Xiu-gang,LI Dong,

地球物理学进展 , 2008,
Abstract: Oil and gas exploration is turning to the areas with irregular topography and complex geologic structures.Prestack depth turns out to be a valid way to deal with irregular topography and complex geologic structures."wave field downward continuation" and "wave field upward continuation" are valid way to solve the problem of irregular surface migration.xwfd pre-stack migration based on wave equation has strong adaptability to the medium which has strong variable transverse velocity and it can be used for migration with dual-complexity.However the error arise from xwfd equation affect the quality of dual-complexity migration.We use the xwfd prestack migration with error compensation to improve the migration quality of dual-complexity.Numerical tests in theoretical model and actual data have been done and get better result.The error compensation can be done among several steps.We can find from the analysis that comparing to the ffd depth migration based on irregular surface,it has both advantages in migration quality and efficiency.
Migra??o Kirchhoff em profundidade de se??es de ondas planas
Pestana, Reynam C.;Moreira Neto, Celso A.;
Revista Brasileira de Geofísica , 2007, DOI: 10.1590/S0102-261X2007000400001
Abstract: we present a migration method for plane wave source data based on the kirchhoff integral. plane wave migration has been employed to increase the efficiency of the wavefield extrapolation. point source records are synthesized into a plane wave and the resulting plane wave data can be migrated using the same scheme as the one for conventional shot-record migration. plane wave migration reduces the migration computation time, because the extrapolation does not need to be done for all the individual shot records, but only for the constant plane wave sections. here we have developed a version of the plane wave migration method based on the kirchhoff integral. to calculate the traveltimes for the point source and also for plane wave we used a eikonal solver. once all plane waves section are migrated independently of the others, the final image is obtained by stacking all common images gathers. integral methods are easier than the wave equation methods to adapt to different recording geometries and also allow large and small models to be treated in the same way. also, with the aid of the asymptotic ray theory (art), integral methods can be extended to handle arbitrary velocity structures without any dip limitation. in this paper the seg-eage salt model example and a real dataset from gulf of mexico are used to test the theory and show that kirchhoff plane wave depth migration can produce images comparables in quality to those obtained with kirchhoff migration and also a reduced computation cost when comparable with the kirchhoff migration of common shot gathers.
A new method of anisotropic pre-stack depth migration

地球物理学进展 , 2010,
Abstract: The Dongpu depression is a faulted basin with versatile depositional environment, broken fault-blocks and complicated structures. Its local structure is controlled by faults. There are major lateral velocity alternations because of different buried depths of contemporaneous strata in the two sides of faults. But time migration is unable to work out this problem, so anisotropic pre-stack depth migration has been applied to this area, and high density velocity analysis is ombined with acoustic logging data. The results show coincidence of seismic and drilling with anisotropy PSDM.
Research and Application for Auto-adaptive converted wave shot- domain migration

LI Da-wei,HE Yan,GAO Hong-liang,ZHONG Ping,

地球物理学进展 , 2009,
Abstract: We suggest a method abandoning the search for common converted points and adjusting polars, and taking receive point as fictitious source, and using one-way wave equation performance to converted wave migration in shot domain. Because the method carries on the auto-adapted characteristic which does not need to seek for the converted point position and adjust polarity, especially suits the complex structure converted wave imaging, and reduces the link that estimating converted point position in the entire processing flow, advantageous in raising precision and efficiency. The processing effect pf the theoretical model and field data has proven that the methodis correct and effective.
Fast reconstruction of wave-field propagator in wave-equation depth migration

LU Xiao-lin,

地球物理学进展 , 2005,
Abstract: Computer's capacity and memory are key factors in pre-stack depth migration based on wave-equation. Nowadays, pre-stack depth migration comes into use in industrial production along with the appearance of Beowulf PC-clusters, but it still takes much longer time than traditional post-stack migration. In this paper, we smooth the propagator with cubic spline function then reconstruct the propagator adopting sample function. Thus we can reduce the use of computer's memory and in the meantime ensure accuracy, so that the whole dat-processing time is shortened.
Prestack Depth Migration by a Parallel 3D PSPI  [PDF]
Seonghyung Jang, Taeyoun Kim
International Journal of Geosciences (IJG) , 2016, DOI: 10.4236/ijg.2016.77067
Abstract: Prestack depth migration for seismic reflection data is commonly used tool for imaging complex geological structures such as salt domes, faults, thrust belts, and stratigraphic structures. Phase shift plus interpolation (PSPI) algorithm is a useful tool to directly solve a wave equation and the results have natural properties of the wave equation. Amplitude and phase characteristics, in particular, are better preserved. The PSPI algorithm is widely used in hydrocarbon exploration because of its simplicity, efficiency, and reduced efforts for computation. However, meaningful depth image of 3D subsurface requires parallel computing to handle heavy computing time and great amount of input data. We implemented a parallelized version of 3D PSPI for prestack depth migration using Open-Multi-Processing (Open MP) library. We verified its performance through applications to 3D SEG/EAGE salt model with a small scale Linux cluster. Phase-shift was performed in the vertical and horizontal directions, respectively, and then interpolated at each node. This gave a single image gather according to shot gather. After summation of each single image gather, we got a 3D stacked image in the depth domain. The numerical model example shows good agree- ment with the original geological model.
Preserved-amplitude migration with dual-complexity

YE Yue-Ming,LI Zhen-Chun,TONG Zhao-Qi,CAO Wen-Jun,

地球物理学报 , 2008,
Abstract: Oil and gas exploration is turning to the areas with irregular topography and complex geologic structures.Prestack depth migration turns out to be a valid way to deal with irregular topography and complex geologic structures."Wave field downward continuation" based on accumulating step by step is a valid way to solve the problem of irregular surface migration.Xwfd pre-stack migration based on wave equation has strong adaptability to the medium which has strong variable transverse velocity and it can be used for migration with dual-complexity.Similar to other conventional migration,it makes just continuation of phase and does nothing to the amplitude.We derived the preserved-amplitude xwfd one-way wave equation operator and added the error compensation caused when solving the wave equation.Based on the xwfd error compensation preserved-amplitude operator,we use the method of "wave field downward continuation" to process the dual-complexity model and real seismic data.The impulse response test and the results of the prestack depth migration for model and real seismic data show that the method is an effective tool for dual-complexity.The error compensation can be done during several continuation steps,compared to conventional Finite Difference Fourier(fft)it has better migration quality.
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