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A Waveform Inversion Method for Reflected Waveform Constrained by Smoothness along Stratum Strike

A waveform inversion and smooth constraint technology, applied in the field of oil and gas exploration, can solve the problem of poor stability of reflected wave waveform inversion

Active Publication Date: 2020-10-27
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides a reflection wave waveform inversion method constrained by smoothness along the stratum strike, which is used to solve the problem of poor stability of the current reflection wave waveform inversion

Method used

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  • A Waveform Inversion Method for Reflected Waveform Constrained by Smoothness along Stratum Strike
  • A Waveform Inversion Method for Reflected Waveform Constrained by Smoothness along Stratum Strike
  • A Waveform Inversion Method for Reflected Waveform Constrained by Smoothness along Stratum Strike

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Embodiment 1

[0070] Embodiment 1 provides a smooth-constrained reflection wave waveform inversion method along the stratum strike, the reflection wave waveform inversion method includes the following steps:

[0071] Step A: Select the initial background velocity model v b , set the termination error ∈, the maximum number of iterations k, and set up the expression to minimize the objective function φ as follows:

[0072]

[0073] u in formula 1 δ represents the predicted reflected wave field, R represents the geophone operator used to extract the record of the receiver point from the reflected wave field, d represents the actually observed record, v b represents the background velocity, m δ represents the reflection axis model;

[0074] Step B: Set reflection axis model m δ = 0;

[0075] Step C: Calculate the temporary reflection axis model m δ , including the following steps:

[0076] Step C1: Minimize the objective function with respect to the reflection axis model m δ gradient...

Embodiment 2

[0115] Embodiment 2 integrates the diffusion equation in Embodiment 1 into the minimized objective function φ to form a new objective equation, and the expression of this new objective equation is:

[0116]

[0117] In formula 6, is the anti-smooth operator along the formation interface, such as the difference operator along the interface; μ 2 is the weighting coefficient.

[0118] Therefore, the wave equation (Equation 2) and the new objective equation (Equation 6) can be used to construct a smooth-constrained reflected wave waveform inversion system along the formation strike. Step A, step B, step C and step E are the same as in embodiment 1, the difference is that in step D, the background velocity model v is updated according to the gradient calculation of the new objective function (Formula 6) b , at the same time, in order to eliminate the columnar and spherical false anomalies produced by the inversion of the unconstrained reflected wave waveform, a new gradient g...

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Abstract

The invention discloses a reflected wave waveform inversion method for smooth constraints along a strata direction. The reflected wave waveform inversion method comprises the steps of: selecting an initial background velocity model; setting a reflection axis model to zero; calculating a temporary reflection axis model; updating a background speed of the smooth constraints along the strata direction; and determining whether to terminate the inversion. The reflected wave waveform inversion method for the smooth constraints along the strata direction aims as the problems of unstable inversion process of the unconstrained reflected wave waveform inversion at present and the like, introduces the smooth constraints along the strata direction according to a geological law, and identifies a formation interface by utilizing a temporary reflection axis image of reflected wave waveform inversion, obtains the direction of strata by utilizing the formation interface, improves the stability of the inversion by implementing the means of smooth constraints along the strata direction through solving an anisotropic diffusion equation, and eliminates the columnar and spherical false anomalies, thereby improving the accuracy of inversion.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration, in particular to a reflection wave waveform inversion method constrained by smoothness along stratum strike. Background technique [0002] Seismic waves are an important source of information for understanding the complex structure and structure of the earth's interior, and for finding mineral and oil and gas resources. Seismic waves include reflected waves, refracted waves, and many other types. However, under the existing observation techniques and conditions, only reflected waves can reach the depth of oil and gas reservoirs. At present, waveform inversion is the most advanced imaging method. Combining reflected wave data and waveform inversion technology for reflected wave waveform inversion, an important method for imaging deep oil and gas reservoirs has been formed. However, due to the limited range of surface observation, the reflected waves that can be collected have a l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
CPCG01V1/282
Inventor 姚刚吴迪
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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