Simulation method of interbed multiples with controllable position grading in oil and gas reservoirs

Abstract

The invention discloses a simulation method of interbed multiples with controllable position grading in oil and gas reservoirs, and belongs to the field of forward simulation of a seismic wavefield. The method includes adaptive continuation step distance calculation, two-dimensional counter-cycle continuation boundary reflection processing and dual position restraint in wavefield simulation. The method realizes simulation of grading interbed multiples in a recursive cycle manner based on adaptive variable step distance wavefield continuation and comprises an input data preparation process, a recursive cycle wavefield simulation process and a boundary reflection suppression process. Dual position restraint is added to a model so that the interbed multiples between the grades generated by aspecific stratum can be simulated; artificial boundary reflection generated in a wavefield continuation process is suppressed by employing the two-dimensional counter-cycle continuation method so thata boundary reflection suppression effect better than the conventional boundary attenuation is obtained; and an adaptive variable step distance wavefield continuation technology is proposed so that the efficiency of wavefield simulation is greatly improved.

Description

technical field [0001] The invention belongs to the field of seismic wave field forward modeling, and relates to adaptive variable step length wave field continuation, two-dimensional counter-periodical continuation boundary reflection processing and double horizon constraints in wave field simulation, and in particular to an oil and gas reservoir that can The layer-controlled multiple wave simulation method between layers is a numerical simulation method for simulating the primary wave between specified layers and the multiple wave field between layers in the shot set domain. Background technique [0002] Low-velocity layers generally exist in the depth of China's oil and gas reservoirs, such as the low-velocity mudstone shale layers of the Permian and Ordovician in the Sichuan Basin, the Jurassic coal seams in the Tarim Basin, and the Jurassic coal seams in the Yili Basin. The existence of these low-velocity layers leads to the development of interlayer multiples in seismi...

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Problems solved by technology

In 1974, Kennett et al. proposed an interlayer multiple wave simulation method based on the reflectivity method[7], but this method cannot adapt to the lateral change of the medium well, and cannot achieve interlayer multiple wave simulation between specified formations. In 1989, Covey et al. proposed an interlayer multiple wave simulation method based on ray tracing[8]. Models that cannot cope with complex changes

Recently, Berkhout proposed a full wave field simulation method based on wave

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