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Spherical wave Fresnel integral reflection coefficient calculation method

A technology of spherical wave reflection and reflection coefficient, applied in the field of seismic exploration, to achieve the effect of improving spatial horizontal resolution and avoiding reflection coefficient errors

Active Publication Date: 2020-11-13
CHINA UNIV OF PETROLEUM (EAST CHINA)
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However, in the current existing technology, there is no technical solution to d

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  • Spherical wave Fresnel integral reflection coefficient calculation method
  • Spherical wave Fresnel integral reflection coefficient calculation method
  • Spherical wave Fresnel integral reflection coefficient calculation method

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Embodiment 1

[0095] Figures 4a-4d It is a schematic diagram of the spherical wave reflection coefficient (dotted line and double dashed line) amplitude and phase changing with frequency and depth that is calculated in embodiment 1; wherein, Figure 4a is a schematic diagram of the relationship between the amplitude of the spherical wave reflection coefficient and the frequency, Figure 4b It is a schematic diagram of the relationship between the phase of the spherical wave reflection coefficient and the frequency, Figure 4c is a schematic diagram of the relationship between the amplitude of the spherical wave reflection coefficient and the depth, Figure 4d Schematic diagram of the relationship between the phase of the spherical wave reflection coefficient and the depth; it can be seen that the critical angle is included in Embodiment 1. When the seismic wave incident angle is less than the critical angle, the difference between the spherical wave reflection coefficient and the plane wa...

Embodiment 2

[0098] Figures 5a-5b It is a schematic diagram of the spherical wave reflection coefficient (dotted line and double dashed line) amplitude and phase changing with frequency and depth that embodiment 2 calculates; Wherein, Figure 5a is a schematic diagram of the relationship between the amplitude of the spherical wave reflection coefficient and the frequency, Figure 5b It is a schematic diagram of the relationship between the phase of the spherical wave reflection coefficient and the frequency, Figure 5c is a schematic diagram of the relationship between the amplitude of the spherical wave reflection coefficient and the depth, Figure 5d is a schematic diagram of the relationship between the phase of the spherical wave reflection coefficient and the depth; it can be seen that the critical angle is not included in Embodiment 2, and the spherical wave reflection coefficient and the plane wave reflection coefficient maintain a good consistency;

[0099] Figure 7a-7b It is ...

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Abstract

The invention relates to the technical field of calculation methods of spherical wave reflection coefficients in seismic exploration technologies, and particularly discloses a calculation method of aspherical wave Fresnel integral reflection coefficient. The method comprises the following steps: step 1, deriving an elastic medium spherical wave reflection coefficient equation; step 2, setting seismic harmonic wavelength, frequency, incident angle, reflection point and interface depth; step 3, calculating an elliptic equation and a rotating coordinate system; step 4, calculating a Fresnel zonerange; step 5, solving a Fresnel zone boundary incident angle; and step 6, deriving a spherical wave Fresnel integral reflection coefficient equation. According to the method, the magnitude of seismic reflection wave energy can be more visually and truly reflected; on the basis of a spherical wave reflection coefficient equation, the integral range is limited in a Fresnel zone, reflection coefficient errors caused by plane wavefront hypothesis are avoided, and spatial transverse resolution improvement, observation system establishment and geological anomalous body recognition are facilitated.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to the problem of seismic wave reflection and seismic resolution, especially the calculation method of spherical wave reflection coefficient. Background technique [0002] In seismic exploration, AVO (Amplitude variation with offset) or AVA (Amplitude variation with angle) technology can identify reservoirs and Oil and gas has become the main technology for hydrocarbon detection. As the theoretical and application basis of AVO / AVA technology, seismic wave reflection coefficient can intuitively reflect the magnitude of seismic reflection wave energy at different incident angles, so that it can be used to analyze underground lithology and search for oil and gas. [0003] At present, seismic exploration acquisition, processing, and interpretation technologies are generally based on plane wave theory, and most widely used reflection coefficients are approximate reflection c...

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/306G01V1/307G01V2210/62G01V2210/63
Inventor 程广森宗兆云印兴耀
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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