Pre-conditioned time domain elastic medium multi-parameter full-waveform inversion method

A full-waveform inversion, elastic medium technology, applied in the field of oil and gas geophysical exploration engineering, can solve the problems of relying on the initial model, high computational cost, method non-convergence, etc., to achieve the effect of accelerating convergence efficiency, improving inversion quality, and improving stability

CN111766628APending Publication Date: 2020-10-13SHANDONG LANGCHAO YUNTOU INFORMATION TECH CO LTD
4 Cites 10 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-10-13

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a pre-conditioned time domain elastic medium multi-parameter full-waveform inversion method, which comprises the following steps of: S1, selecting a plurality of scale frequency groups to pre-process observation data and seismic wavelets; S2, calculating target seismic source wavelet and a plurality of parameter initial models through staggered grid finite difference forward modeling to obtain a simulated observation record, and acquiring a wave field residual error by subtracting an observation record under each scale from the simulated observation record under the corresponding scale; S3, solving a conjugate operator of a positive operator through adopting an adjoint state method, and acquiring a residual wave field through utilizing the wave field residual error;S4, calculating parameter gradients of a parameter initial model through using the residual wave field and the simulated observation record, and preprocessing all the parameter gradients; S5, optimizing the initial iteration step length through employing a parabola fitting method; and S6, updating a formula and all parameter models through adopting an LBFGS method model to obtain a multi-parameter inversion result. According to the pre-conditioned time domain elastic medium multi-parameter full-waveform inversion method, the efficiency, effect and stability of multi-parameter full-waveform inversion are effectively improved.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the field of oil and gas geophysical prospecting engineering, in particular to a preconditioned time domain elastic medium multi-parameter full waveform inversion method. Background technique

[0002] At present, the focus of oil and gas exploration is shifting from structural exploration to lithological exploration. Compared with traditional migration imaging methods, multi-parameter elastic wave full waveform inversion can provide more accurate compressional and shear wave velocities, as well as better Abundant elastic parameters and other information are beneficial to seismic data interpretation and oil and gas development.

[0003] Since the full waveform inversion theory is based on data fitting and relies heavily on the initial model, a low-precision model will cause the method to not converge. At the same time, due to the limitations of seismic data acquisition technology and other aspects, the lack of low-frequency inf...

Examples

Embodiment Construction

[0079] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment, so that those skilled in the art can better understand the present invention and can be implemented, but the embodiment given is not as the limitation of the present invention, in the case of no conflict Next, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.

[0080] It should be understood that in the description of the embodiments of the present invention, words such as "first" and "second" are only used to distinguish the purpose of description, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or imply order. "Multiple" in the embodiments of the present invention refers to two or more.

[0081] The term "and / or" in the embodiment of the present invention is only an association relationship describing associated obje...