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Acoustic logging first arrival pickup method

A well logging and acoustic wave technology, which is applied in seismology, measuring devices, and geophysical measurements for well logging records. It can solve problems such as difficulty in identification, low accuracy of first-arrival picking, and signal-to-noise ratio effects. Achieve low resolution, reduce human influence, and good stability

Pending Publication Date: 2021-03-26
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0003] A comprehensive analysis of the existing acoustic wave first-arrival picking algorithms found that the current picking-up first-arrival wave technology has at least the following problems: 1. It is significantly affected by the signal-to-noise ratio; 2. In formations with serious acoustic signal attenuation such as coal seams, expanding diameters, and soft formations The picking accuracy of the first arrival of the segment is not high; 3. It is difficult to identify the formation segments with low signal resolution such as thin interbeds and interlayers

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Embodiment

[0053] Such as figure 1 As shown, a method for picking up the first arrival of acoustic logging in the present invention, the specific implementation process is as follows:

[0054] Step 1, perform acoustic logging, such as digital acoustic logging, variable density acoustic logging, array acoustic logging, etc., to obtain wave train data;

[0055] Step 2: Analyze the waveform distribution characteristics of the wave train data to determine the approximate distribution range of the wave train effective signal in the time domain and the approximate distribution range of the longitudinal wave; perform Fourier transform on the wave train data to obtain a spectrogram and analyze the wave train data The spectrum distribution feature determines the distribution range of the wave train effective signal in the frequency domain. See attached figure 2 .

[0056] Step 3: Perform band-pass filtering according to the distribution range of the wave train effective signal obtained in ste...

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Abstract

The invention discloses an acoustic logging first arrival pickup method, which is characterized in that on the basis of acquired logging wave train data, on the basis of band-pass filtering and fuzzynested multistage median filtering denoising, a dynamic self-adaptive first arrival pickup range is solved through time difference obtained by an STC method, and acoustic wave first arrival is solvedby adopting a waveform envelope energy ratio method in the range. The method can accurately pick up the sound wave first arrival of the stratum with low signal-to-noise ratio and serious attenuation and the thin interbed and interlayer development stratum section.

Description

technical field [0001] The invention belongs to the field of geophysical well logging, and relates to a first-arrival picking method for acoustic logging. Background technique [0002] In the process of acoustic wave data processing, the accurate picking of first arrival time is the foundation of petrophysical model establishment, and it is also an important parameter based on ray tracing compressional wave radial velocity imaging. In recent years, predecessors have achieved a lot of research results on the first arrival picking method. Qiao Baoping and others proposed a grid subdivision slowness model, and calculated the first arrival travel time from four directions (CN110568497A); Xu Yinpo et al. The ratio method is used to obtain multi-track first arrivals, and on this basis, the first-arrival credibility coefficient is calculated, and the first-arrival channel with high credibility coefficient is selected for fitting to obtain the first-arrival predicted value (CN102313...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/40G01V1/30G01V1/28
CPCG01V1/40G01V1/306G01V1/307G01V1/28
Inventor 周军申珍珍马修刚曹先军孙佩倪路桥余长江王雷陈小磊张娟段先斐
Owner BC P INC CHINA NAT PETROLEUM CORP
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