Stratum acoustic wave impedance information inversion method
A wave impedance and acoustic wave technology, applied in the field of formation acoustic wave impedance information inversion
Pending Publication Date: 2020-09-15
中普宝信(北京)科技有限公司
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[0004] Therefore, there is currently a lack of a solution for the inversion of acoustic wave impedance information in subsurface media in areas with severe velocity changes or low-velocity bodies.
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[0038] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments . Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0039] The present invention aims at the difficulty of shallow layer modeling, especially in the case of severe speed changes and the development of low-speed orbiting bodies, avoids the weakness based on ray theory, and comprehensively utilizes the wave field information within a period of time after the first arrival to realize shallow high-level modeling. precision modeling. In particular, it solves areas where low-velocity bodies devel...
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The invention relates to a stratum acoustic wave impedance information inversion method comprising the following steps: obtaining a plurality of single-shot data of seismic source vibration in a detection area, the single-shot data comprising single-shot single-channel data and single-shot multi-channel data; intercepting a direct wave, a shallow reflection wave and a shallow refraction wave in the plurality of single shot data by using a time window to obtain observation data; acquiring an initial wave impedance model, and performing forward modeling on a seismic source waveform based on theinitial wave impedance model to obtain forward modeling data; calculating a wave field residual error according to the observation data and the forward modeling data, and constructing an error functional according to the wave field residual error; performing back propagation to an initial wave impedance model space by using the wave field residual error to obtain residual error back propagation data; utilizing the forward modeling data and the residual back propagation data to calculate a wave impedance updating gradient of an error functional according to an adjoint state method; and updatingthe initial wave impedance model by utilizing the wave impedance updating gradient of the error functional to obtain an accurate wave impedance model.
Description
technical field [0001] The invention relates to the technical field of geophysical exploration, in particular to a method for inversion of formation acoustic wave impedance information. Background technique [0002] In the field of exploration geophysics technology, shallow layer modeling technology has always been a difficult point in the modeling of subsurface medium parameters. At present, the method of tomographic inversion of first arrival travel time based on rays is more commonly used. This type of method is simple to calculate, does not require accurate background model parameter fields, and applies to complex surface conditions, so it has always been a common method for solving near-surface and shallow subsurface parameter modeling. However, this method is based on the shortest path principle of high-frequency assumptions. In the case of low-speed body development, this technology has a modeling 'blind zone'. In addition, ray-based methods are sensitive to ray wav...
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IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/306G01V2210/6226
Inventor 王潇潇雷霆孙博文
Owner 中普宝信(北京)科技有限公司