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Wave impedance inversion method based on joint dictionary

A wave impedance inversion and wave impedance technology, applied in the field of geophysical exploration interpretation, can solve problems such as the ill-posedness of the objective function, and achieve the effect of enhancing vertical resolution and clear stratum structure information

Active Publication Date: 2020-01-14
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

However, in practical applications, there are still many problems in the seismic inversion technology. The core problem is that the objective function to be solved in the seismic inversion problem is often ill-conditioned.

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  • Wave impedance inversion method based on joint dictionary
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  • Wave impedance inversion method based on joint dictionary

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Embodiment Construction

[0057] In order to facilitate those skilled in the art to understand the technical content of the present invention, the content of the present invention will be further explained below in conjunction with the accompanying drawings.

[0058] In order to facilitate those skilled in the art to understand the content of the present invention, the following technologies are now described:

[0059] 1. Post-stack wave impedance inversion

[0060] Wave impedance inversion is an inversion method that obtains the formation wave impedance coefficient from the reflection coefficient under the elimination of the influence of seismic wavelets. The wave impedance coefficient is closely related to the velocity of seismic wave propagation and the medium density, and the logarithm can be obtained by the product of velocity and density Get (Gui Zhongxi 2010). Wave impedance inversion is the main method of post-stack seismic inversion and has broad application prospects. In 1983, Cook and Schn...

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Abstract

The invention discloses a wave impedance inversion method based on a joint dictionary, which is applied to the technical field of geophysical exploration and interpretation, and aims to solve the problem that the conventional sparse dictionary is obtained through high-frequency-band logging data learning and lacks logging data low-frequency-band information. The method comprises the following steps: firstly, training a joint dictionary, specifically, obtaining the joint dictionary containing high-frequency and low-frequency information through logging data learning containing low-frequency information and high-frequency information, the joint dictionary comprising a low-frequency dictionary and a high-frequency dictionary; then, constructing an initial model containing a low-frequency component by using the low-frequency dictionary; and finally, performing sparse inversion on the initial model by using the high-frequency dictionary, thereby obtaining a wave impedance sequence containing a low-frequency component and a high-frequency component. Compared with the prior art, the inversion result of the method is closer to a real model.

Description

technical field [0001] The invention belongs to the technical field of geophysical exploration and interpretation, and in particular relates to a wave impedance inversion technology. Background technique [0002] Seismic exploration has always been the most important and effective method for detecting oil and gas reservoirs in geophysical exploration. The so-called seismic exploration technology is to use the response of seismic waves to infer the properties of the underground medium and the structure of the stratum. Its main working process is: artificially triggering earthquakes through industrial blasting or pile driving to generate crustal vibrations to form seismic waves, and the seismic waves propagate downward along the stratum. When encountering the elastic medium interface, reflection will occur. At this time, the precision instruments on the ground will record the vibration of each sampling point on the ground. By analyzing the characteristics of the recorded sampl...

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Application Information

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IPC IPC(8): G01V1/28G01V1/40
CPCG01V1/282G01V1/40
Inventor 王峣钧张归前刘宇林文城武洋
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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