Method for acquiring converted wave, electronic device and readable storage medium

An electronic device, comprising a memory, a processor, and a computer program stored in the memory and can run on the processor, wherein when executing the computer program, the processor implements a method for acquiring a converted wave of a P-wave collected during seismic exploration, comprising:

• collecting the P-wave during the seismic exploration;
• acquiring a relational expression between a P-wave reflection coefficient and an incident angle by Zoeppritz equation, wherein the relational expression between the P-wave reflection coefficient and the incident angle is:
• Rp(θ)≈P+G sin2(θ)+C sin2(θ)tg2(θ),
• wherein tg(θ)=sin(θ)/cos(θ);
• θ represents an incident angle, an intercept P represents an amplitude at a normal incidence, a slope G represents a change rate of a reflection amplitude versus an offset, C represents a parameter associated with the two sides of the reflection interface, and Rp (θ) represents a P-wave reflection coefficient;
• simplifying the relational expression between the P-wave reflection coefficient and the incident angle;
• calculating a derivative for the simplified relational expression between the P-wave reflection coefficient and the incident angle, to obtain an expression of a wave to be converted, wherein the expression of the wave to be converted is:
• Rp′(θ)≈2G sin(θ)cos(θ)=G sin(2θ)
• wherein
• G
• =
• 1
• 2
• ·
• Δ
• ⁢
• α
• α
• -
• 4
• *
• β
• 2
• α
• 2
• ⁢
• Δ
• ⁢
• β
• β
• -
• 2
• *
• β
• α
• ⁢
• Δ
• ⁢
• ρ
• ρ
• ;
• α represents a P-wave velocity;
• β represents an S-wave velocity;
• Δα represents an average value of the P-wave velocities on a reflection interface;
• ρ represents a density;
• Δβ represents an average value of the S-wave velocities on the reflection interface;
• and Δρ represents an average value of the densities on two sides of the reflection interface;
• correcting parameters in the expression of the wave to be converted to obtain the converted wave of the P-wave.

A non-transitory readable storage medium on which a computer program is stored, wherein when being executed, the computer program implements the following steps of a method for acquiring a converted wave of a P-wave collected during seismic exploration:

• collecting the P-wave during the seismic exploration;
• acquiring a relational expression between a P-wave reflection coefficient and an incident angle by Zoeppritz equation, wherein the relational expression between the P-wave reflection coefficient and the incident angle is:
• Rp(θ)≈P+G sin2(θ)+C sin2(θ)tg2(θ),
• wherein tg(θ)=sin(θ)/cos(θ);
• θ represents an incident angle, an intercept P represents an amplitude at a normal incidence, a slope G represents a change rate of a reflection amplitude versus an offset, C represents a parameter associated with the two sides of the reflection interface, and Rp (θ) represents a P-wave reflection coefficient;
• simplifying the relational expression between the P-wave reflection coefficient and the incident angle;
• calculating a derivative for the simplified relational expression between the P-wave reflection coefficient and the incident angle, to obtain an expression of a wave to be converted, wherein the expression of the wave to be converted is:
• Rp′(θ)≈2G sin(θ)cos(θ)=G sin(2θ)
• wherein
• G
• =
• 1
• 2
• ·
• Δ
• ⁢
• α
• α
• -
• 4
• *
• β
• 2
• α
• 2
• ⁢
• Δ
• ⁢
• β
• β
• -
• 2
• *
• β
• α
• ⁢
• Δ
• ⁢
• ρ
• ρ
• ;
• α represents a P-wave velocity;
• β represents an S-wave velocity;
• Δα represents an average value of the P-wave velocities on a reflection interface;
• ρ represents a density;
• Δβ represents an average value of the S-wave velocities on the reflection interface;
• and Δρ represents an average value of the densities on two sides of the reflection interface;
• correcting parameters in the expression of the wave to be converted to obtain the converted wave of the P-wave.