CN-116338796-B - Acoustic logging method, system, storage medium and equipment for detecting polarity inversion

CN116338796BCN 116338796 BCN116338796 BCN 116338796BCN-116338796-B

Abstract

The invention discloses a sound wave logging method, a system, a storage medium and equipment for detecting polarity inversion, in particular to a method for detecting polarity inversion of sound wave logging of an acquisition orthogonal dipole four-component wave train, which is used for acquiring and processing data of the orthogonal dipole four-component wave train and calculating a wave train data range needing to be analyzed, firstly calculating and detecting whether the YY component wave train is inverted, then normalizing the wave trains of other three components by taking the YY component wave train as a reference, then summing the YY component wave trains, comparing absolute values, determining polarity inversion when the number of the absolute values of the accumulated sum absolute values is smaller than 2/3 of the number of the absolute values of the two components involved in summation exceeds the analysis point number, realizing detection and correction of whether the polarity of the four-component wave train is inverted, ensuring that the subsequent processing results of inversion of stratum anisotropy by the dipole four-component wave train, well cycle scanning reflected wave imaging and the like are reasonable, and solving the problems that the stratum anisotropy is very high or the synthesized data of the azimuth imaging are abnormal.

Inventors

MA XIUGANG
YU CHANGJIANG
ZHANG JUAN
DUAN XIANFEI
ZHENG HAO
GAO ZONGHUI
DU QINBO
YU WENMAO
ZHOU JUN
YANG JUPENG
SHEN ZHENZHEN
NI LUQIAO
CHEN XIAOLEI
LI GUOJUN
CAO XIANJUN
WANG LEI

Assignees

中国石油天然气集团有限公司
中国石油集团测井有限公司

Dates

Publication Date: 20260512
Application Date: 20211225

Claims (10)

1. A sonic logging method for detecting polarity reversal, comprising the steps of: s1, acquiring and processing quadrature dipole four-component wave train data; s2, calculating a wave train data range to be analyzed based on the processed data; s3, normalizing and summing the dipole component wave train data obtained through analysis according to the maximum value of the absolute value of the wave train value received by the first group of the current depth component wave trains; S4, comparing the sum absolute value of each point of the component wave train with the waveform absolute value of the component wave train, recording the number of points of which the sum absolute value is simultaneously smaller than the absolute values of the two components involved in the sum, and judging whether the polarity of the depth point is reversed according to the obtained number of points; S5, repeating the steps S2-S4, counting and marking the number of points of the polarity inversion of the whole well section of the component wave train, marking whether the current wave train is inverted or not based on the obtained number of points, and correcting the component wave form with the polarity inversion based on the judgment result.
2. A sonic logging method for detecting polarity reversal according to claim 1, comprising the steps of: s3, normalizing and summing the dipole component wave train data obtained through analysis according to the maximum value of the absolute value of the wave train value received by the first group of the current depth YY component wave trains; S4, comparing the sum absolute value of each point of the YY component wave train with the waveform absolute value of the YY component wave train, recording the number of points of which the sum absolute value is simultaneously smaller than the absolute values of the two components involved in the sum, and judging whether the polarity of the depth point is reversed according to the obtained number of points; s5, repeating the steps S2-S4, counting and marking the number of points of polarity inversion of the whole well section of the YY component wave train, and marking whether the current wave train is inverted or not based on the obtained number of points; S6, repeating S2-S5, detecting the waveforms of the polarity components of the dipoles XY and YX respectively, judging whether the polarities occur, and correcting the component waveform with the reversed polarities according to the judging result.
3. The acoustic logging method of claim 1, wherein the S1 acquisition of processed data comprises: Each depth head wave arrival time Time sampling interval of wave train And the center frequency of the dipole source.
4. The acoustic logging method of claim 1, wherein calculating the range of wave train data to be analyzed in S2 comprises: wave train start position The determination mode of (a) is as follows: The wave train length analyzed was Wherein the method comprises the steps of Representing the center frequency of the dipole generating transducer, and 3 represents the 3 wave train periods that need to be analyzed.
5. The acoustic logging method of detecting polarity reversal of claim 4, wherein S3 comprises the steps of: the analyzed component wave is listed in the window Every depth point by point Maximum value of absolute value of wave train value received by first component Post-normalization summation Wherein: Wherein, the The value range is 。
6. The acoustic logging method of detecting polarity reversal of claim 5, wherein S4 comprises the steps of: Comparing each point sum Absolute value and waveform And Absolute value of (1) when Is simultaneously smaller than the waveform And Counting at absolute value of (2) When (when) Wave train analysis point number greater than two-third The depth point polarity inversion is marked: The step S5 comprises the following steps: Counting the number of points of polarity inversion of the full-well section mark When the depth point of polarity inversion is greater than the total depth point At 2/3 of the total number of the dipole poles is reversed.
7. A sonic logging method for detecting polarity reversal according to claim 2, characterized in that S6 comprises the steps of: If XX and YX are reversed in polarity, the polarity of the X-emission or Y-emission transducer chip is reversed, and if XX and XY are reversed in polarity, the polarity of the X-receiving or Y-receiving transducer chip is reversed; component waveforms with reversed polarity Performing polarity inversion correction:
8. An acoustic logging system for detecting polarity reversal according to claim 1, comprising a quadrature dipole four-component acquisition module, a wave train analysis module, a component wave train normalization summation module, and a polarity judgment correction module; the orthogonal dipole four-component acquisition module is used for acquiring and processing orthogonal dipole four-component wave train data; the wave train analysis module is used for calculating a wave train data range to be analyzed based on the processed data; the component wave train normalization summation module is used for normalizing and summing the dipole component wave train data obtained by analysis according to the maximum value of the absolute value of the wave train value received by the first group of the current depth component wave trains; the polarity judging module is used for comparing the sum absolute value of each point of the component wave train with the waveform absolute value of the component wave train, recording the number of points of which the sum absolute value is simultaneously smaller than the absolute values of the two components involved in the sum, and judging whether the polarity of the depth point is reversed or not according to the obtained number of points; The full-well polarity judging and correcting module is used for counting and marking the number of the polarity inversion points of the full-well section of the component wave train, marking whether the current wave train is inverted or not based on the obtained number of the polarity inversion points, and correcting the component wave form with the polarity inversion points based on the judging result.
9. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1-7 when the computer program is executed.
10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method according to any one of claims 1-7.

Description

Acoustic logging method, system, storage medium and equipment for detecting polarity inversion Technical Field The invention belongs to the technical field of acoustic logging, and relates to an acoustic logging method, an acoustic logging system, a storage medium and equipment for detecting polarity inversion. Background In an array acoustic or other acoustic logging instrument with orthogonal dipole four-component logging capability, during the assembly process of the dipole four-component transmitting or receiving transducer sheet, the situation of polarity inversion occurs due to the fact that the positive and negative electrode materials of the transducer are consistent with the appearance structure, and the waveform positive peak and the waveform negative peak of two components are interchanged after polarity inversion. The instrument is put into field use, and dipole four-component wave train data (WV xx、WVxy、WVyx、WVyy) obtained through measurement is used for processing such as stratum anisotropy inversion or well periphery scanning reflected wave imaging, and the like, so that the false image with great stratum anisotropy or abnormal azimuth imaging wave train synthetic data can occur. There is a lack of methods for polarity reversal detection and correction for dipole four component wave train data in sonic logging. Disclosure of Invention The invention aims to solve the problems in the prior art and provides an acoustic logging method, a system, a storage medium and equipment for detecting polarity inversion. In order to achieve the purpose, the invention is realized by adopting the following technical scheme: a sonic logging method for detecting polarity reversal, comprising the steps of: s1, acquiring and processing quadrature dipole four-component wave train data; s2, calculating a wave train data range to be analyzed based on the processed data; s3, normalizing and summing the dipole component wave train data obtained through analysis according to the maximum value of the absolute value of the wave train value received by the first group of the current depth component wave trains; s4, comparing the sum absolute value of each point of the component wave train with the waveform absolute value of the component wave train, recording the number of points of which the sum absolute value is smaller than the sum absolute value of each point and the waveform absolute value of the component wave train, and judging whether the polarity of the depth point is reversed according to the obtained number of points; S5, repeating the steps S2-S4, counting and marking the number of points of the polarity inversion of the whole well section of the component wave train, marking whether the current wave train is inverted or not based on the obtained number of points, and correcting the component wave form with the polarity inversion based on the judgment result. The method is further improved as follows: the method also comprises the following steps: s3, normalizing and summing the dipole component wave train data obtained through analysis according to the maximum value of the absolute value of the wave train value received by the first group of the current depth YY component wave trains; S4, comparing the sum absolute value of each point of the YY component wave train with the absolute value of the YY component wave train waveform, recording the number of points of which the sum absolute value is simultaneously smaller than the sum absolute value of each point and the absolute value of the YY component wave train waveform, and judging whether the polarity of the depth point is reversed according to the obtained number of points; s5, repeating the steps S2-S4, counting and marking the number of points of polarity inversion of the whole well section of the YY component wave train, and marking whether the current wave train is inverted or not based on the obtained number of points; S6, repeating S2-S5, detecting the waveforms of the polarity components of the dipoles XY and YX respectively, judging whether the polarities occur, and correcting the component waveform with the reversed polarities according to the judging result. The S1 acquisition processing data comprises: Each depth head arrival time TT (i), the time sampling interval TS of the wave train, and the center frequency of the dipole source. The calculating the wave train data range to be analyzed in the step S2 comprises the following steps: the wave train starting position Wins (i) is determined in the following manner: Wins(i)=TT(i)/TS(1) (1) The analyzed wave train length was WinL: Where Fre central represents the center frequency of the dipole generating transducer and 3 represents the 3 wave train periods that need to be analyzed. The step S3 comprises the following steps: The analyzed component wave trains are summed up Sum **yy(ti after the window [ Wins (i), wins (i) + WinL ] is normalized point by point for the maximum Max (abs (WV yy(ti)) of the