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System and method for estimating seismic material properties

A medium and characteristic technology, applied in seismology, seismic signal processing, seismic signal receiver, etc., can solve problems such as noise sensitivity, impractical source-receiver structure, and solution non-uniqueness

Inactive Publication Date: 2003-03-19
SCHLUMBERGER HLDG LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, these techniques suffer from at least one of the following disadvantages: non-uniqueness of solutions, susceptibility to noise, and impractical source-sink structures

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  • System and method for estimating seismic material properties
  • System and method for estimating seismic material properties
  • System and method for estimating seismic material properties

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Embodiment Construction

[0018] The volume record of the wavefield can be used to calculate and transform the spatial wavefield derivative for the Earth's P and S velocities in the vicinity of a small, closely spaced array of receivers. "Volume record" refers to the fact that the array approximately encloses a volume of the Earth. This makes the spatial derivative of the wave field computable in all directions. The quantities estimated are the instantaneous effective velocities of the P and S components of the wavefield at any point. As such, these will vary with mode and wavelength. If estimating near-surface Earth structure, such velocities can be used for static estimation, or for decomposing the wavefield into upgoing and downgoing components. Further details of wavefield decomposition can be found in UK patent application GB 2333 364 A (published 21 July 1999), and UK patent entitled "System and method for seismic wavefield decomposition" filed 5 February 2000 application (UK Patent Applicatio...

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Abstract

A method for estimating near-surface material properties in the vicinity of a locally dense group of seismic receivers is disclosed. The method includes receiving seismic data that has been measured by a locally dense group of seismic receivers. Local derivatives of the wavefield are estimated such that the derivatives are centered at a single location preferably using the Lax-Wendroff correction. Physical relationships between the estimated derivatives including the free surface condition and wave equations are used to estimate near-surface material properties in the vicinity of the receiver group. Another embodiment of the invention is disclosed wherein the physical relationships used to estimate material properties are derived from the physics of plane waves arriving at the receiver group, and the group of receivers does not include any buried receivers.

Description

field of invention [0001] The present invention relates to the field of determining the characteristics of land seismic wavefields. In particular, the invention relates to estimating seismic medium properties near receivers by processing seismic data from several locally dense sets of receivers. Background of the invention [0002] Previous research has developed and tested methods for transforming seismic data conditions for elastic properties of earth structures near or far from seismic data receivers. When the converted data records are real seismic waveforms, the process is called waveform conversion. These techniques compare seismic waves produced by an integrated earth model with those recorded; the model is then modified in such a way as to reduce the mismatch between the two sets of waveforms. So far, the study of waveform transformation has solved the wave equation in the earth model, which is used to predict and fit the particular waveform recorded, where the pre...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/20G01V1/28G01V1/30G01V1/32G01V1/36
CPCG01V1/364G01V2210/42G01V1/286G01V1/30G01V1/20G01V1/32
Inventor 安德鲁·科蒂斯约汉·奥罗夫·安德斯·罗伯森雷姆科·姆伊斯
Owner SCHLUMBERGER HLDG LTD