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Real-time compression method of three-dimensional sonic logging data

A technology of logging data and compression method, applied in the direction of electrical components, code conversion, etc., can solve the problems of real-time storage and transmission difficulties, and reduce data storage and transmission.

Inactive Publication Date: 2012-06-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0009] The purpose of the present invention is to overcome the defects of large 3D acoustic logging data and the difficulty of real-time storage and transmission under the condition of limited downhole data transmission, and provide a real-time compression method for 3D acoustic logging data, so as to realize the downhole instrument in a large number of Real-time and effective compression of logging data while collecting signals, reducing the amount of data storage and transmission, and improving logging efficiency

Method used

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  • Real-time compression method of three-dimensional sonic logging data
  • Real-time compression method of three-dimensional sonic logging data
  • Real-time compression method of three-dimensional sonic logging data

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Embodiment

[0032] image 3 It is a flow chart of a specific embodiment of a real-time compression method for three-dimensional acoustic logging data.

[0033] 1. Pretreatment

[0034] In this example, if image 3 As shown, firstly, the original acoustic wave data is preprocessed, and the preprocessing process is as follows Figure 4 As shown, in this embodiment, the effective sound wave data obtained by sampling is 24 bits. For the convenience of processing, it is stored in the input buffer as 32-bit original sound wave data, and its highest 8 bits are all zeros. Such as Figure 4 As shown, the n=32-bit raw sound wave data in the input buffer is split into high n 1 = 16 bits of reserved data and low n 2 = 16 bits of data to be compressed, and stored in the reserved data array and the data array to be compressed respectively. In the follow-up operation, only the data in all the arrays to be compressed, that is, the lower 16-bit data of the original sound wave data is compressed, and...

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Abstract

The invention discloses a real-time compression method of three-dimensional sonic logging data, which comprises the following steps: dividing data to be compressed into data to be compressed, which have the length of m, by splitting original sonic data into retention data with a high n1 bit and the data to be compressed, which have a low n2 bit; then carrying out DCT (discrete cosine transformation) on the data to be compressed according to groups to obtain mapping data, quantifying the mapping data, i.e. retaining more bit numbers for the data with larger numerical value while retaining less bit numbers for the data with smaller numerical value, realizing the real-time compression of the data and coding the data after being quantified; and finally, merging the retention data with the high n1 bit in retention data number groups and the data after being coded so as to obtain compressed data. Therefore, the storage quantity and the transmission quantity of data are reduced, and the logging efficiency is enhanced.

Description

technical field [0001] The invention belongs to the technical field of data compression, and more specifically relates to a real-time compression method of three-dimensional acoustic logging data. Background technique [0002] 3D acoustic logging is a new generation of acoustic logging technology developed on the basis of orthogonal dipole acoustic logging technology. Its measurement principle is to use all current acoustic waves, namely monopole, dipole and Stoneley The waveforms of various frequency bands are comprehensively measured to obtain the three-dimensional acoustic wave characteristics of the formation, that is, the longitudinal wave time difference, shear wave and Stoneley wave changes in the axial, radial and circumferential directions of the wellbore, and provide a complete description of the azimuth of the formation characteristics. Through this technique, the anisotropy of homogeneous and heterogeneous formations and various mechanisms of anisotropy formation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M7/30
Inventor 张伟师奕兵刘西恩仇傲林聪
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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