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A Method for Computing the Relative Azimuth of Microseismic Events in Well

A relative azimuth, microseismic technology, applied in seismology, seismic signal processing, geophysical measurement and other directions, to achieve the effect of improving positioning accuracy

Active Publication Date: 2020-09-29
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Application Information

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Problems solved by technology

However, under the condition of low signal-to-noise ratio, the particle trajectory of the P-wave signal may not be strictly linear, and the polarization azimuth angle obtained by the sagittal curve method has great uncertainty and error

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  • A Method for Computing the Relative Azimuth of Microseismic Events in Well
  • A Method for Computing the Relative Azimuth of Microseismic Events in Well
  • A Method for Computing the Relative Azimuth of Microseismic Events in Well

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Embodiment Construction

[0048] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. However, it should be understood that the accompanying drawings are provided only for better understanding of the present invention, and they should not be construed as limiting the present invention.

[0049] Such as figure 1 Shown, the present invention provides a kind of method for calculating the relative azimuth angle of the microseismic event in the well, also known as the maximum projection value method, (Maximum Projection, abbreviated MP), and it comprises the following steps:

[0050] 1) Determine template event and target event;

[0051] Two sets of microseismic events are taken from the observation station data, and one microseismic event is used as a template event, and the other microseismic event is used as a target event;

[0052] The observation station refers to multiple three-component geophones set in the well, and the data of the ...

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Abstract

The invention discloses a method for calculating a relative azimuth angle of microseism events in a well. The method is characterized by comprising the steps of (1) determining a template event and atarget event, selecting any two groups of microseism events from observation station data, taking one microseism event as a template event, and taking the other microseism event as a target event, (2)rotating the target event at a predetermined angle along a reverse azimuth direction of the target event and calculating a projection value of the rotated target event on the template event, and (3)determining a relative direction angle and determining a maximum projection value of the rotated target event in the template event, wherein an angle alpha corresponding to the maximum projection value is the relative azimuth angle of the template event and the target event, and the angle alpha = {-pi + the number of rotations of the target event * a predetermined angle}.

Description

technical field [0001] The invention relates to a method for calculating the relative azimuth angle of a microseismic event in a well, belonging to the field of microseismic three-component signal processing in a well. Background technique [0002] Well microseismic monitoring technology is one of the important new technologies for hydraulic fracturing fracture evaluation. This technology uses three-component geophones arranged in adjacent wells to record microseismic signals accompanied by fracture shear slip, and quantitatively evaluates the spatial distribution of hydraulic fractures and the volume of reservoir stimulation. Under single-well monitoring conditions, the conventional processing method is to use polarization analysis and first-arrival picking to obtain the azimuth and P-wave time difference relative to the source, and then further invert to obtain the source location of the microseismic. Therefore, accurate calculation of azimuth angle is a key technology to...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
CPCG01V1/288
Inventor 陈海潮程冬冬孟晓波钮凤林
Owner CHINA UNIV OF PETROLEUM (BEIJING)