Process for inversing soft ground horizontal wave velocity by leaky mode waves

A technology of leakage mode and shear wave velocity, which is applied in the direction of earthwork drilling and production, wellbore/well components, etc., to achieve the effect of broadening the application field and improving the application value
CN101285381AInactive Publication Date: 2008-10-15CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (EAST CHINA)
Publication Date
2008-10-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a method for inversion of speed of soft formation transverse waves by leaky mode waves, belonging to a logging technology applying physical geophysical sound waves. The specific steps are as follows: inputting wave shape of monopole or dipole leaky mode waves of a soft formation well section with serious diameter extension and conventional well measurement data of corresponding well section formation; extracting a phase velocity dispersion curve of the leaky mode waves from array wave shape and determining the main energy frequency range of the leaky mode waves; at various speeds of formation transverse waves, calculating variance between the leaky mode waves speed calculated by theoretical arithmetic and the leaky mode waves phase velocity extracted from field array wave shape; determining the corresponding formation transverse wave speed in a state in which the variance is zero so as to carry out successive well section processing and output an inversion transverse speed result map. The invention solves the problem of the prior multipole subarray acoustic logging apparatus that the formation transverse wave speed can not be directly measured in the soft formation well sections with ultra-large well diameters, loose superficial layers or serious diameter extension. The method expands the application fields of the borehole acoustic logging technology in oil exploration process and oil development process, and improves the application value of the borehole acoustic logging technology.
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Description

technical field

[0001] The invention belongs to the application of geophysical acoustic logging technology, in particular to a method for inverting the shear wave velocity of formations by using dispersed leakage mode waves in the exploration of soft formations with super large diameters, loose shallow layers or serious diameter expansion. Background technique

[0002] With the development of oil exploration and development technology, seismic exploration and drilling engineering and other fields urgently require acoustic logging to provide accurate formation shear wave velocity profiles, such as seismic elastic wave impedance inversion, seismic AVO attribute processing, drilling formation pressure prediction and well Evaluation of Wall Stability. At present, borehole acoustic logging technology is the most effective means to provide continuous formation shear wave velocity profile. However, in soft formations where the formation shear wave velocity is lower than the sound ...

Claims

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