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Full-waveform inversion method for VSP seismic data converted waves

A technology of full waveform inversion and seismic data, applied in the field of exploration geophysics, can solve the problems of severe nonlinearity, failure of large-scale promotion, strong multi-solution, etc.

Inactive Publication Date: 2018-11-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

However, due to multi-parameter coupling, elastic wave full waveform inversion has serious nonlinearity and strong multi-solution, so it has not been widely promoted in industry.

Method used

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  • Full-waveform inversion method for VSP seismic data converted waves
  • Full-waveform inversion method for VSP seismic data converted waves
  • Full-waveform inversion method for VSP seismic data converted waves

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Embodiment Construction

[0086] The present invention will be described in detail below in combination with specific embodiments.

[0087] like figure 1 Shown, be the flow chart of the present invention's implementation of VSP seismic data converted wave full waveform inversion, specifically include:

[0088] (1) PS converted wave separation of original VSP seismic data;

[0089] Separation of uplink PS converted waves by global optimization parameter inversion method;

[0090] (2) Establishment of the initial model of shear wave velocity;

[0091] Input the longitudinal wave velocity model, obtain the shear wave velocity model according to the empirical formula, and smooth it to obtain the initial shear wave velocity model;

[0092] (3) The source wave field is extended forward to separate the longitudinal and transverse wave fields;

[0093] The forward P-S wave field and the simulated VSP PS-wave record are obtained at each time step by solving the elastic wave equation for the separation of P-...

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Abstract

The invention discloses a full-waveform inversion method for VSP seismic data converted waves. Uplink PS converted waves are separated through a global optimization parameter inversion method; transverse wave speed is claculated according to an empirical formula, and is subjected to smoothing processing to obtain an initial transverse wave speed model; an elastic wave equation of longitudianl andtransverse wave separation is solved to obtain a forward propagation longitduinal and transverse wave field and simulated VSP PS wave record of each time step; an accompanying elastic wave equation oflongitudinal and transverse wave separation is solved to obtain back propagation longitduinal and transverse wave field of each time step; a forward propagation longitudinal wave field and a back propagation transverse wave field are adopted to calculate a transverse wave speed gradient; a three-point parabola fitting method is adopted to obtain an iteration step size; a transverse wave speed model is updated through an L-BFGS method; and multi-scale inversion is performed from low frequency to high frequency by applying Wiener filtering. The full-waveform inversion method for VSP seismic data converted waves has the beneficial effect of improving the precision of the full-waveform inversion of the VSP seismic data converted waves and improving an inversion effect of a complex structure through a longitudinal and transverse wave separation strategy.

Description

technical field [0001] The invention belongs to the technical field of exploration geophysics, and relates to a new full waveform inversion method, which can be used for VSP seismic data inversion to obtain a high-precision converted wave velocity model. Background technique [0002] With the deepening of oil and gas exploration and development and the continuous improvement of borehole seismic technology, the research and application of VSP (vertical seismic profiling) exploration technology has also been developed rapidly. In areas with complex structures or complex media, VSP technology can effectively understand the geological structure, petrophysical properties and other characteristics near the wellbore. Through VSP imaging combined with ground three-dimensional seismic data and lithological data, fine seismic attribute analysis can be carried out, and key layers can be further verified, the contact relationship between rock layers can be clarified, an accurate geologi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/30
Inventor 任志明李振春黄少华
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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