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Application of Gaussian beam migration to VSP imaging

Yang Feilong, Sun Hui

Acta Geophysica

2019

Vol. 67, no. 6

1579--1586

Vertical seismic profiling (VSP) technology plays an important role in oil and gas exploration. It can obtain data in the well with higher resolution than conventional surface seismic imaging methods, and effectively identify small faults along the well, thereby improving the description accuracy of the reservoir. Gaussian beam migration (GBM) has the ability to calculate the multi-arrival travel time, which has the advantages of both high efficiency and high imaging accuracy. In this paper, the observation system and the local plane wave decomposition step will be adjusted to expand the prestack GBM into a VSP imaging method. A layer model and a complex model will be employed to verify the imaging ability of VSP GBM. The correctness of VSP GBM will be proved by practical data test through comparing the results of VSP GBM with Kirchhoff migration in surface seismic.

Method for correction of the prestack migration amplitude of converted waves

Kostecki A., Półchłopek A.

Acta Geophysica

2006

Vol. 54, no. 2

113-125

The paper presents a method for correction of amplitude of prestack migration using the reflectivity function. The solution of wave equations for heterogeneous media expressed in the form of Neumann series for converted waves was used to find the reflectivity function. The performance of the proposed method was verified using synthetic models of wavefields. The synthetic models of wavefields were also used to compare amplitude correction levels required by the presented method and the standard amplitude correction methods, i.e., the methods using the spherical divergence and extention factor.