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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

Inactive Publication Date: 2008-10-15
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for retrieving the shear wave velocity of soft formations by leakage mode waves, so as to solve the problem of inversion of shear wave velocities in soft formations with large borehole diameter, loose shallow layer or serious diameter expansion by using dispersed leakage mode waves technical issues

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

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[0024] The present invention is described as follows about accompanying drawing:

[0025] figure 1 It reflects the waveform data and comparison of monopole and dipole acoustic logging in loose shallow well sections. This well section is a soft formation well section. The first track in the figure shows natural gamma ray, bit size and borehole diameter curves, and the second track , 3 tracks give dipole and unipolar waveforms respectively. From the monopole and dipole waveforms of the 430-435m and 446-452m sections, it can be seen that: due to serious diameter expansion, the monopole and dipole acoustic logging data have only one leakage mode wave, and no monopole is excited. Pole Stoneley waves and dipole bending waves.

[0026] figure 2 It reflects the array time-domain waveform of monopole acoustic logging synthesized theoretically in soft formations. It can be seen from the figure that the monopole acoustic source in this soft formation only excites leaky mode waves wit...

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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.

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 ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
Inventor 苏远大秦瑞宝孙建孟邓启才陈雪莲汤丽娜庄春喜
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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