Reverse time migration method of carbonatite reservoir

Abstract

The invention discloses a reverse time migration method of a carbonatite reservoir. By aiming at a phenomenon that a fracture-cavity pore construction of carbonatite is always companied with fracture and big-angle form distortion formed due to construction movement, the reverse time migration method is used for precisely depicting the carbonatite. A finite difference method is used for solving a wave equation to simulate a seismic wave field; a processing method for the wave field to transmit to a boundary adopts a PML (Perfectly Matched Layer) absorbing boundary condition; a seismic origin wave field recovery part adopts a reverse PML wave field recovery technology; and a calculation part adopts a GPU (Graphics Processing Unit) parallel acceleration technology. The PML absorbing boundary condition is adopted, so that the invention can more effectively eliminate boundary reflection interference than a random boundary condition; since the reverse PML wave field recovery technology is adopted, compared with a traditional wave field storage strategy, the invention can greatly reduce requirements on a storage amount on the premise that a calculated amount is not increased, a wave field recovery effect is good, amplitude fading is avoided, and operation efficiency is improved by adopting the GPU parallel acceleration technology.

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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