Longitudinal wave and converted wave prestack joint inversion method and system

A technology of joint inversion and conversion of waves, applied in the field of oil and gas geophysics, which can solve the problems of joint inversion result error, accurate matching of small layers in difficult reservoir sections, affecting the accuracy of joint inversion results of reservoir sections, etc.

Active Publication Date: 2020-02-11
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

If the sub-layers of the reservoir segment are matched incorrectly, it will lead to errors in the joint inversion results
The existing P-wave and converted-wave matching methods based on the principle of waveform similarity can basica

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  • Longitudinal wave and converted wave prestack joint inversion method and system
  • Longitudinal wave and converted wave prestack joint inversion method and system
  • Longitudinal wave and converted wave prestack joint inversion method and system

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Embodiment Construction

[0062] When a longitudinal wave is excited on the ground, when the seismic wave encounters an interface during propagation, a reflected longitudinal wave, a reflected shear wave, a transmitted longitudinal wave, and a transmitted shear wave will be generated. The energy of the reflected longitudinal wave is called the reflected longitudinal wave reflection coefficient, and the energy of the reflected transverse wave is called the reflected converted wave coefficient. The approximate formulas for the reflection coefficients of reflected longitudinal waves and reflected converted waves are (Aki&Richard, 1980):

[0063]

[0064]

[0065] in,

[0066] In the formula is the rate of change of longitudinal wave velocity, is the rate of change of shear wave velocity, is the density change rate; θ is the average value of the longitudinal wave reflection angle and transmission angle, is the average value of the converted wave reflection and transmission angles.

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Abstract

The invention discloses a longitudinal wave and converted wave prestack joint inversion method and system. The method comprises the steps that a longitudinal wave angle gather and a converted wave angle gather are input; longitudinal wavelets and converted wavelets at all angles are extracted; an initial elasticity parameter model of a longitudinal wave time domain is established; a longitudinal wave synthesis record error of the longitudinal wave time domain is calculated; a time-displacement operator matrix and an error back-propagation operator matrix are calculated; a converted wave synthesis record error of a converted wave time domain is calculated; a total error of longitudinal waves and converted waves in the longitudinal wave time domain is calculated; if the total error is smaller than or equal to a set error threshold value, an elasticity parameter inversion result is output; and if the total error is greater than the set error threshold value, a logarithmic elasticity parameter model of the longitudinal wave time domain is updated. Through the method and system, longitudinal wave and converted wave prestack joint inversion in which longitudinal waves and transverse waves are precisely and automatically matched is realized, the precise and stable elasticity parameter inversion result is acquired, and reservoir prediction precision is improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas geophysics, and more specifically, to a method and system for combined prestack inversion of longitudinal waves and converted waves. Background technique [0002] Multi-wave seismic exploration is a very potential method for the exploration of lithologic and subtle oil and gas reservoirs. Although great progress has been made in the research and practical application of multi-wave multi-component seismic exploration technology in the world, there has been no significant progress, and it has become a "bottleneck" restricting the further development of multi-wave seismic exploration technology. The matching of multi-wave data, the joint inversion of multi-wave data, the comprehensive interpretation of multi-wave and the geological application of full-wave attributes have always been the focus and difficulty of multi-wave seismic interpretation, reservoir prediction and gas-bearing prediction. ...

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Application Information

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IPC IPC(8): G01V1/50
CPCG01V1/50G01V2210/6169G01V2210/624
Inventor 陈天胜张珺季玉新
Owner CHINA PETROLEUM & CHEM CORP
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