A Reverse Time Migration Method for Carbonate Reservoirs

Abstract

The invention discloses a method for reverse time migration of carbonate rock reservoirs. The method adopts the method for fracture-cave pore structures of carbonate rocks which are often accompanied by fractures and large-angle shape distortions formed due to tectonic movements. The reverse time migration method is used to describe it accurately, and the finite difference method of the present invention solves the wave equation to simulate the seismic wave field. The processing method of wave field propagation to the boundary adopts PML absorption boundary conditions, and the source wave field restoration part adopts inverse PML wave field restoration Technology, the computing part adopts GPU parallel acceleration technology. The present invention adopts PML absorption boundary conditions, which can more effectively eliminate boundary reflection interference than random boundary conditions, and adopts inverse PML wave field recovery technology, compared with traditional wave field storage strategies, it can greatly reduce The demand for storage capacity is met, and the recovery effect of the wave field is good, without amplitude attenuation. The GPU parallel acceleration technology is used to improve the computing efficiency.

Description

technical field [0001] The invention belongs to the field of reverse time migration, in particular to a method for reverse time migration of carbonate reservoirs. Background technique [0002] Carbonate Rock Background Technology [0003] Carbonate reservoir structures and seepage channels are mostly dominated by pores and fractures connecting them, and this type of reservoir is usually a high-permeability reservoir. A large number of oil and gas exploration practices at home and abroad have proved that carbonate reservoirs mainly have the characteristics of high permeability, slight and complex pore structure, and strong heterogeneity, which also brings new challenges to the accurate identification of this type of reservoir by seismic exploration methods. greater difficulty. Due to the serious scattering and weak energy of the reflected wave of the carbonate reservoir structure, and the complex structure results in poor coherence of the reflected wave, it is difficult to ...

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Problems solved by technology

[0010] The purpose of the present invention is to provide a method for reverse time migration of carbonate reservoirs, which aims to solve the problems of high cost of reverse time migration and large demand for storage capacity, and at the same time, effectively eliminate the boundary noise caused by numerical calculation , improve the accuracy of imaging algorithm, make full use of the advantages of reverse time migration algorithm in complex media imaging, and improve the identification accuracy of fractures and caves in carbonate rock reservoirs

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