Array acoustic logging head wave arrival time determination method and device

An array acoustic wave logging and determination method technology, applied in the field of oil and gas exploration, can solve the problems affecting the accuracy and efficiency of the extraction of the first wave arrival time, and the distortion of the processing results, and achieves reduction of manual intervention, low signal-to-noise ratio, simple and convenient operation. Effects that are easy to implement

Pending Publication Date: 2021-10-29
PETROCHINA CO LTD
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Problems solved by technology

[0003] At present, the methods for determining the arrival time of the first wave mainly include threshold detection method, difference detection method, sliding time window method, long and short time window energy ratio method, etc. The results of ...

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  • Array acoustic logging head wave arrival time determination method and device
  • Array acoustic logging head wave arrival time determination method and device
  • Array acoustic logging head wave arrival time determination method and device

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[0049] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is an embodiment of a part of the application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0050] Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, systems, or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore,...

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Abstract

The invention provides an array acoustic logging head wave arrival time determination method and device, and the method comprises the steps: carrying out the local autocorrelation analysis and local standard deviation analysis of the full-wave waveform data of a depth of a pre-designated reference channel, and generating a local autocorrelation attribute channel and a local standard deviation attribute channel; combining the local self-correlation attribute channel and the local standard deviation attribute channel according to a preset weight to obtain a combined attribute channel; calculating the energy ratio of the combined attributes in the front and back time windows at each sampling point in the preset time range on the combined attribute channel, and taking the time corresponding to the sampling point with the maximum energy ratio as the head wave arrival time of the reference channel; and performing cross-correlation analysis on the data in the preset window length at different waveform recording times of the other channels and the data in the preset window length of the reference channel, and taking the waveform recording time corresponding to the maximum value of the correlation coefficient on each channel as the head wave arrival time on the corresponding channel, so that the head wave arrival information is effectively highlighted, the rapid and accurate extraction of the head wave arrival time is realized, and the effect is relatively good under the condition of low signal-to-noise ratio.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration, in particular to a method and device for determining the arrival time of the first wave of array acoustic logging. Background technique [0002] During the drilling process, the formation damage caused by mechanical collision or stress release, the change of pore fluid properties caused by mud invasion, and the expansion of clay minerals due to water absorption may cause the elastic wave velocity of the formation near the wellbore wall and far away from the wellbore wall to be different, which is called formation Radial change in velocity. Analyzing the radial variation of formation velocity is of great significance for estimating formation stress, evaluating wellbore stability, predicting perforation penetration depth, and optimizing formation fracturing design. P-wave traveltime tomography technology is an effective means to analyze the radial variation of formation velocity. T...

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Application Information

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IPC IPC(8): G01V1/30G01V1/40
CPCG01V1/303G01V1/305G01V1/40
Inventor 王浩王才志原野李伟忠刘英明傅海成夏守姬刘雅慧
Owner PETROCHINA CO LTD
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