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APPLIED GEOPHYSICS  2017, Vol. 14 Issue (3): 381-386    DOI: 10.1007/s11770-017-0626-9
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Conjugate gradient and cross-correlation based least-square reverse time migration and its application
Sun Xiao-Dong1,2, Ge Zhong-Hui1, and Li Zhen-Chun1
1. China University of Petroleum (Hua Dong), Qingdao 266580, China.
2. Laboratory for Marine Mineral Resource, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China.
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Abstract Although conventional reverse time migration can be perfectly applied to structural imaging it lacks the capability of enabling detailed delineation of a lithological reservoir due to irregular illumination. To obtain reliable reflectivity of the subsurface it is necessary to solve the imaging problem using inversion. The least-square reverse time migration (LSRTM) (also known as linearized reflectivity inversion) aims to obtain relatively high-resolution amplitude preserving imaging by including the inverse of the Hessian matrix. In practice, the conjugate gradient algorithm is proven to be an efficient iterative method for enabling use of LSRTM. The velocity gradient can be derived from a cross-correlation between observed data and simulated data, making LSRTM independent of wavelet signature and thus more robust in practice. Tests on synthetic and marine data show that LSRTM has good potential for use in reservoir description and four-dimensional (4D) seismic images compared to traditional RTM and Fourier finite difference (FFD) migration. This paper investigates the first order approximation of LSRTM, which is also known as the linear Born approximation. However, for more complex geological structures a higher order approximation should be considered to improve imaging quality.
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Key wordsReverse time migration   reflectivity   Hessian matrix   conjugate gradient     
Received: 2017-05-13;

This research is sponsored by The National Natural Science Fund (No. 41574098) and Sinopec Geophysical Key Laboratory Open Fund (No. wtyjy-wx2016-04-2).

Cite this article:   
. Conjugate gradient and cross-correlation based least-square reverse time migration and its application[J]. APPLIED GEOPHYSICS, 2017, 14(3): 381-386.
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