Method and system for determining excitation high-energy and high-frequency parameters of uncoupled charging type explosive source

Abstract

The invention relates to a method and system for determining excitation high-energy and high-frequency parameters of an uncoupled charging type explosive source, and the method comprises the steps: A,building an explosion effect finite element model in rock and soil of the explosive source, and determining the dynamic deformation model parameters of each layer of rock and soil; B, determining dynamic wave impedance of each layer, and preliminarily determining an uncoupled medium of the uncoupled charging type explosive source according to a matching relationship between the dynamic wave impedance and the uncoupled medium; and C, presetting a series of corresponding uncoupled coefficients, and after the structure of the uncoupled charging type explosive source is determined, calculating near-source wave fields generated by the excitation of the uncoupled charging type explosive source with different uncoupled coefficients by utilizing the established explosion effect finite element model to determine the uncoupled coefficients meeting the requirements of energy and resolution. The method can quickly and efficiently determine the excitation high-energy and high-frequency parametersof the uncoupled charging type explosive source, and meets the requirements of high-energy and high-frequency seismic wave parameters of deep exploration.

Description

technical field [0001] The field of the invention relates to the field of geophysical exploration, in particular to a method and a system for determining high-energy and high-frequency parameters excited by an uncoupled charge type explosive seismic source. Background technique [0002] The process of seismic waves excited by explosive sources is relatively complex, involving multiple physical processes, and the energy and spectrum characteristics of seismic waves excited by explosive sources vary greatly. The change of the excitation condition of the explosive source directly affects the near-field characteristics of the seismic wave generated by it, thus affecting the quality of seismic exploration. There are many factors affecting the generation and propagation of explosion seismic waves, and the different factors can be attributed to three aspects: the explosion source, the transmission medium and the transmission path. Relatively speaking, the influence law of the expl...

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Problems solved by technology

[0004] Aiming at the problems of weak reflected seismic wave energy, high frequency, serious high-frequency attenuation and weak reflected signal energy in the existing method for determining excitation parameters of explosive seismic sources, the present invention proposes a method for determining high-energy high-frequency parameters excited by explosive-charged seismic sources , based on the established finite element model of explosive action in rock and soil of explosive source to preliminarily determine the uncoupling medium of the uncoupled charge explosive source, and then determine the uncoupling coefficient satisfying the energy and resolution, which has the advantages of fast determination method and wide application range , and low cost, easy to implement and other advantages

The present invention also relates to a system for determining high-energy and high-frequency parameters excited by an uncoupled charge-type explosive source

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