Staggered mesh wave equation forward modeling method based on actual seismic data

A seismic data, staggered grid technology, applied in the field of exploration seismic forward modeling, can solve the problems of low calculation efficiency, poor matching of seismic data, long calculation time, etc., to overcome dispersion phenomenon, improve forward modeling accuracy, and improve calculation Effects of Efficiency and Computational Accuracy

CN105158797AActive Publication Date: 2015-12-16CHENGDU UNIVERSITY OF TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2015-12-16

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Abstract

The invention discloses a staggered mesh wave equation forward modeling method based on actual seismic data. The method performs forward modeling by using a wavelet of actual seismic data in order to overcome a defect of poor seismic data matching in the prior art; performs constraint on a forward modeling parameter by using a high-order difference scheme and multi-source information in order to improve forward modeling precision and overcome a frequency dispersion phenomenon; tightly combines known multi-source data (such as seismic, logging, geological data and the like), optimizes a forward modeling technique process and a geologic modeling process, sets an observation system in advance in order to prevent manual observation system parameter modification in a forward modeling process and improve computational efficiency and computational precision. The method is based on actual seismic, logging, and geological data, uses a wavelet of the actual earthquake data, performs forward modeling on an actual geologic model by using a method of post-stack iterating the geologic model step by step and then after-stack forward modeling, flexibly matches seismic data of various regions, and has high computational precision and computation efficiency.
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Description

technical field

[0001] The invention belongs to the technical field of seismic forward modeling simulation for exploration, in particular to a method for forward modeling of interlaced grid wave equations based on actual seismic data. Background technique

[0002] Seismologists first used the finite difference method to solve the wave propagation problem as early as 40 years ago. Most of the early finite difference methods for studying seismic wave propagation were based on the second-order displacement equation. Alterman and Karal (1968) first applied the finite difference method to numerical simulation of seismic waves in homogeneous media. Boore (1972) used the finite difference method to simulate the propagation of seismic waves in heterogeneous media. Alford (1974) studied the accuracy of finite-difference simulations of the acoustic wave equation. Kelly et al. (1976) studied methods for making synthetic seismic records using finite differences. Mdariga (1976) propos...

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Embodiment Construction

[0057] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0058] The present invention provides a staggered grid wave equation finite difference forward modeling method based on actual seismic data, which performs wave equation forward modeling for a two-dimensional geological model, can be used in reverse time migration, full waveform inversion, etc., and can also effectively It guides the acquisition, processing and interpretation of oil and gas geophysical exploration.

[0059] The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0060] Such as figure 1 As shown, the method for forward modeling o...