Acoustic logging speed smoothing method and system based on K nearest neighbor mean filtering
A logging speed and average value filtering technology, which is applied in the directions of measurement, earthwork drilling and production, borehole/well components, etc., can solve the problems of poor boundary effect, limited application, and inability to maintain boundaries, etc.
Pending Publication Date: 2020-03-17
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
As the time window increases, the degree of smoothing increases, but the effect of maintaining the boundary becomes worse; the traditional mean filtering method is limited in application because it cannot maintain the boundary
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[0029] The present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
[0030] figure 1 A flow chart showing the steps of the K-nearest neighbor mean filter-based acoustic logging velocity smoothing method according to the present invention.
[0031] In this embodiment, the acoustic logging velocity smoothing method based on K-nearest neighbor mean filtering according to the present invention may include: Step 1: Preprocessing the acoustic logging data, eliminating the abnormal values of the acoustic moveout curve, and obtaining the processed acoustic w...
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The invention discloses an acoustic logging speed smoothing method and system based on K nearest neighbor mean filtering. The method comprises the following steps that 1, acoustic logging data is preprocessed, abnormal values of an acoustic wave time difference curve are removed, and a processed acoustic wave time difference curve is obtained; 2, the processed acoustic wave time difference curve is converted into initial acoustic logging speed of a plurality of to-be-measured points; 3, the length of a filtering window and filtering points are determined, and mean filtering smoothing is conducted on the initial acoustic logging speed of the to-be-measured points, and a smoothed acoustic logging speed curve is obtain; and 4, whether the smoothed acoustic logging speed curve reaches a set standard or not is judged, if yes, the smoothed acoustic logging speed curve is output, if not, an initial acoustic logging speed curve is updated, and the step 3 is repeated until the set standard is reached. According to the acoustic logging speed smoothing method and system, by conducting the mean filtering smoothing of the speed, noise and high frequency parts are eliminated, and the boundary ofa thick layer is kept unchanged.
Description
technical field [0001] The present invention relates to the field of well logging curve smoothing processing, and more specifically, to a method and system for smoothing acoustic logging velocity based on K-nearest neighbor mean filtering. Background technique [0002] Regarding the smoothing of the acoustic logging velocity, the most commonly used method is the median filter method. The median filter is a nonlinear signal processing technology based on the sorting statistics theory that can effectively suppress noise. The value of a point is replaced by the median value of each point value in a neighborhood (window) of the point, thereby eliminating isolated noise points. For noise with a larger density, the length of the filter window needs to be increased, but the boundary effect is kept low, and the amount of calculation increases rapidly. The traditional mean filtering method is rarely used in acoustic logging velocity smoothing because the boundary becomes blurred whi...
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Login to View More IPC IPC(8): E21B47/14
CPCE21B47/14
Inventor 周巍郭全仕
Owner CHINA PETROLEUM & CHEM CORP