Downhole microseismic three-component rotating method

A three-component, micro-seismic technology, applied in seismic signal processing and other directions, can solve problems such as inaccuracy and difficulty in finding polarization azimuth, and achieve the effect of less noise and stable calculation results.

Active Publication Date: 2014-12-17
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0012] This method essentially utilizes the consistency between the direct P-wave polarization direction and the wave propagation direction, but in fact, with noise interference, the particle trajectory of the direct P-wave in the X and Y component planes does not necessarily appear strictly linear, which leads to the calculation of the polarization azimuth In other words, this method is greatly affected by background noise; in addition, this method is only suitable for "the first direct P wave", and for the microseismic data in complex fracturing wells that contains multiple P Wave, S wave event signal, it is obviously difficult to find the first direct P wave

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Embodiment Construction

[0069] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0070] The invention of this paper provides a method of using the two-component maximum energy difference technology to realize the X, Y, Z three-component rotation method of the microseismic in the well. The realization of the method includes the following two steps:

[0071] The first step, assuming that there is an azimuth angle θ, through coordinate decomposition, the energy difference between the two components after decomposition is maximized to realize the rotation of the X and Y components of the three-component detector, and obtain the R component of the wave propagation projection direction in the X and Y planes T component perpendicular to it;

[0072] In the second step, assume that there is an azimuth Rotate the Z component and the R component obtained in the first step. The operation is the same as the first step. When the energy difference between the...

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Abstract

The invention discloses a downhole microseismic three-component rotating method and belongs to the field of downhole microseismic three-component signal processing. The method includes: firstly, inputting an X-component and a Y-component, then solving extreme values to obtain an X-direction azimuth and a new R-component and a new T-component; secondly, inputting a Z-component and the R-component prior to solving extreme values to obtain a Z-direction azimuth and a new P-component and a new S-component; finally, taking the P-component, the S-component and the T-component as rotating results of the original X-component, Y-component and Z-component. By the method, accurate rotation of the downhole microseismic X-component, Y-component and Z-component can be realized, the new three components P, S and T uniform in amplitude are obtained, and information such as wave propagation and the azimuth theta of the X-component and the azimuth phi of the Z-component can be obtained. In addition, the method is small in influence of noise and stable in computed results, and input data are unlimited to P-waves or S-waves.

Description

technical field [0001] The invention belongs to the field of microseismic three-component signal processing in wells, and in particular relates to a three-component rotation method for microseismic in wells. Background technique [0002] In-well microseismic fracturing monitoring technology is one of the important new technologies in the field of low permeability oil and gas reservoir fracturing stimulation in recent years. This technology uses a three-component geophone arranged in the well to monitor the changes in the underground stress field caused by operations such as reservoir water injection, gas injection, thermal drive, and oil and gas production, resulting in seismic waves generated by rock formation cracks or dislocations. Seismic data processing, inversion of fracture attributes and fracture geometry and spatial distribution, and then monitoring reservoir performance. [0003] Conventional seismic three-component rotation is realized by coordinate conversion an...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 余波
Owner CHINA PETROLEUM & CHEM CORP
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