Ground microseism pressing crack dynamic spreading real time monitoring method

A real-time monitoring and micro-seismic technology, applied in seismology, geophysical measurement, seismic signal processing, etc., can solve the problems of inability to accurately locate micro-seismic events and difficult to identify micro-seismic events with weak energy

Active Publication Date: 2018-02-23
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Traditional methods based on energy scanning are difficult to accurately identify microseismic events with weak energy, and cannot achieve accurate positioning of microseismic events. Therefore, it is necessary to develop new methods to identify weak signals

Method used

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  • Ground microseism pressing crack dynamic spreading real time monitoring method
  • Ground microseism pressing crack dynamic spreading real time monitoring method
  • Ground microseism pressing crack dynamic spreading real time monitoring method

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Embodiment Construction

[0050] In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments are listed below and shown in the accompanying drawings in detail as follows.

[0051] Such as figure 1 as shown, figure 1 It is a flow chart of the real-time monitoring method for the dynamic distribution of ground microseismic fracturing fractures of the present invention.

[0052] In step 101, deploy natural seismic station instruments or broadband geophones in a uniform, symmetrical, sufficient, and continuous manner on the surface or in shallow wells above the hydraulic fracturing area of ​​the reservoir to obtain hydraulic fracturing reconstruction data of tight reservoirs x, y, z three-component microseismic broadband data; use high-resolution, broadband three-component natural seismic station instruments or broadband geophones, and optimize the ground microseismic observation system on the surface or in shallow wells abov...

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Abstract

The invention provides a ground microseism pressing crack dynamic spreading real time monitoring method comprising the following steps: obtaining continuous microseism data, and dissecting a pressingcrack area grid and building a block type high precision speed model; calculating dissected grid point traveling times, orientation angles and emitting angles; using a spectral decomposition method tocarry out frequency-varied treatments, and calculating a three-component waveform covariance matrix and linear polarization characteristics of three-frequency data; carrying out polarization filtering for frequency-varied data according to the linear polarization characteristics; randomly selecting a dissected grid point, carrying out vector offset imaging for the microseism data after polarization filtering, thus obtaining the grid point imaging energy value; taking an area with the gradient drop-out value greater than a preset threshold as a crack dense area, and obtaining the crack spreading image of said time period. The ground microseism pressing crack dynamic spreading real time monitoring method can provide very good effect in surface microseism monitoring, thus monitoring the micro crack dynamic developments.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a real-time monitoring method for the dynamic distribution of ground microseismic fracturing fractures. Background technique [0002] The fracturing stimulation of unconventional reservoirs is the key technology to improve the recovery of unconventional oil and gas. Microseismic technology is the main technology to monitor the effect of reservoir fracturing stimulation in the process of unconventional oil and gas production. Microseismic monitoring technology can realize the dynamic monitor. For microseismic monitoring in the process of reservoir fracturing, the key link is to accurately identify microseismic events and accurately locate the location of microseismic events, so as to further monitor the dynamic process of microseismic fracture occurrence and development. [0003] Application number is CN94105769 Chinese patent application hydraulic fracturin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/50G01V1/30
CPCG01V1/288G01V1/30G01V1/50G01V2210/1234G01V2210/1425G01V2210/1429G01V2210/161G01V2210/163G01V2210/646
Inventor 尚新民刁瑞芮拥军单联瑜王常波韩宏伟王兴谋李红梅崔庆辉李强王东凯胡晓婷赵翠霞揭景荣
Owner CHINA PETROLEUM & CHEM CORP
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