Suppression of multiple refection–refraction waves in the shallow low velocity zone via vertical source combination

• Autorzy: Chang Suoliang , Qu Zhen , Zhang Sheng , Fu Yanning , Chen Qiang

Identyfikatory

DOI

10.1007/s11600-021-00658-7

• Języki publikacji: EN

Abstrakty

EN

In seismic data from areas with low-velocity structures, a special type of multiple reflected refraction often appears, which seriously affects the effective refection wave of adjacent target layers and causes distortion of the refection wave shape. Based on the kinematic characteristics of the seismic wave field in shallow low-velocity zones, we demonstrate the generation mechanism of multiple reflected refractions. Then, a method of suppressing multiple reflected refractions through vertically combined dual sources is proposed. First, according to the relative position relationship between multiple reflection refractions and the effective wave, prerequisites for the suppression of multiple reflected refractions are established. Second, the optional range of vertical combination parameters is calculated according to the source combination equation, which is used to adjust the relative position of the two sources set vertically in the low-velocity zone. Subsequently, model data verification and application of the Loess Plateau exploration area prove that the vertical source combination method can suppress multiple reflected refractions in shallow low-velocity zones and effectively improve the signal-to-noise ratio of seismic data.

Słowa kluczowe

EN

multiple reflection–refraction; wave suppression; shallow low-velocity zone; vertical combination excitation

PL

wielokrotne odbicie–załamanie; tłumienie fali

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2021
• Tom: Vol. 69, no. 5
• Strony: 1799--1811
• Opis fizyczny: Bibliogr. 24 poz.

Twórcy

autor

Chang Suoliang

• Department of Earth Science & Engineering, Taiyuan University of Technology, Taiyuan, China

• https://orcid.org/0000-0002-6818-0330

autor

Qu Zhen

• Department of Earth Science & Engineering, Taiyuan University of Technology, Taiyuan, China

autor

Zhang Sheng

• Department of Earth Science & Engineering, Taiyuan University of Technology, Taiyuan, China

• https://orcid.org/0000-0002-6818-0330

autor

Fu Yanning

• Shanxi Earthquake Agency, Taiyuan, China

autor

Chen Qiang

• Department of Earth Science & Engineering, Taiyuan University of Technology, Taiyuan, China

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