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Method for carrying out earthquake source mechanism analysis by utilizing micro earthquakes

A focal mechanism and microseismic technology, applied in seismic signal processing and other directions to improve interpretation quality

Active Publication Date: 2013-05-01
刘建中
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Problems solved by technology

[0003] It can be seen that the existing methods have obvious deficiencies and defects in the analysis of the focal mechanism of ground microseismic earthquakes, and further improvement is urgently needed. How to create a new method of focal mechanism analysis using ground microseismic records to make it more It is one of the important topics of current research and development to improve the quality of microseismic interpretation, provide a basis for the reliability of artificial fracturing fracture monitoring results, and solve the problem of verifying artificial fracture monitoring results by the monitoring data itself.

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  • Method for carrying out earthquake source mechanism analysis by utilizing micro earthquakes
  • Method for carrying out earthquake source mechanism analysis by utilizing micro earthquakes
  • Method for carrying out earthquake source mechanism analysis by utilizing micro earthquakes

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[0032] The present invention is a kind of method that utilizes microseismic to carry out focal mechanism analysis, please refer to figure 1 As shown, the steps include:

[0033] In the first step, more than 12 seismic recorders are usually used in the ground microseismic monitoring area where the seismic mechanism is expected to be located at different positions in the monitoring area to record microseismic events during oil field fracturing and water injection. Each seismograph forms a seismic signal record. When recording, the input noise of the recording instrument is required to be lower than 1.5 microvolts. The LFSJ-Ⅴ microseismic recorder developed by Beijing Keruosi Technology Development Co., Ltd. can meet the monitoring requirements. The sampling bit of the instrument is 32 bits, and the sampling rate is 1000 times / Seconds, more than 95% of the time period the input noise of the instrument is less than 1.5 microvolts, with a high signal-to-noise ratio.

[0034] In ...

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Abstract

The invention relates to a method for carrying out earthquake source mechanism analysis by utilizing micro earthquakes. The method comprises the following steps that a plurality of earthquake recorders are arranged in different positions in the same monitoring region for monitoring; earthquake signal recording segments with high correlation are selected for processing; records with relatively clear wave forms are specified as a specified trace, other recording traces and the specified trace are subjected to cross-correlation processing, the correlation coefficient position with the maximum absolute value is obtained, and the time difference of the other recording traces and the specified trace is obtained; time migration is carried out, and other records with the positive maximum correlation coefficient are superposed on the specified trace; the earthquake wave form is displayed through superposition, and a plurality of traces of clear wave forms are obtained through migration and superposition for many times; and the records are divided into two groups according to the positive or negative of the maximum correlation coefficient, the specified recording trace is divided into the group with the positive correlation coefficient, and the earthquake source mechanism is made according to two kinds of symbols. The method has the advantages that the micro earthquake interpretation quality can be greatly improved, and bases are provided for the reliability of manual fracturing crack detection results.

Description

technical field [0001] The invention relates to the technical field of microseismic monitoring, in particular to a method for analyzing the focal mechanism by using ground microseismic. Background technique [0002] In the process of unconventional oil and gas production, it is necessary to use microseismic technology to monitor the fracturing and water injection construction process to explain the direction and shape of fracturing fractures, the distribution of water injection fronts, and the affected area. Microearthquakes usually refer to earthquakes of magnitude -1 to -5, which are small in magnitude, weak in energy, and difficult to distinguish signals. The quality of microseismic interpretation can be greatly improved through focal mechanism analysis, such as: judging the effects of fracturing and water injection, and distinguishing effective fractures, invalid fractures and their directions. In the prior art, downhole microseismic monitoring can obtain clear S-wave r...

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Application Information

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IPC IPC(8): G01V1/30
Inventor 刘建中
Owner 刘建中
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