Automatic identification method of microseismic events based on inter-channel energy superposition

An automatic identification, microseismic technology, applied in seismology, seismic signal processing, measurement devices, etc., can solve the problems of restricting microseismic event recognition and first-arrival picking, low magnitude energy of microseismic, missed detection or false detection, etc. Achieve the effect of guaranteed quantity consistency, improved signal-to-noise ratio, high signal-to-noise ratio and resolution

Active Publication Date: 2018-05-29
JILIN UNIV
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Problems solved by technology

However, due to the low magnitude energy and low signal-to-noise ratio of microseismic events, the identification of microseismic events and the picking of first arrivals are severely restricted.
Conventional single-channel microseismic recording processing methods are prone to missed or false detections

Method used

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  • Automatic identification method of microseismic events based on inter-channel energy superposition
  • Automatic identification method of microseismic events based on inter-channel energy superposition
  • Automatic identification method of microseismic events based on inter-channel energy superposition

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Embodiment

[0036] The embodiment of the present invention adopts the FracStar star geophone array arrangement method to obtain the microseismic fracturing data of all areas around the fracturing well, such as figure 1 shown. The geophones are equidistantly arranged on the survey line L1-L6, and the center of the star is located at the perforation position (such as figure 1 (S0 in the center) is directly above, the dots on the top represent the coordinates of each geophone, the five stars represent the coordinates of the perforation, and the spherical area is the distribution range of microseismic sources. The method of the present invention selects a 6-layer velocity model (see Table 1 for specific parameters), 6 geophones are arranged on each survey line, the track spacing is 65m, the offset distance is 85 meters, and there are 36 tracks in total.

[0037] Table 1 Specific parameters of velocity model

[0038]

[0039] In order to effectively overcome the situation that the convent...

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Abstract

The invention relates to the field of microseismic event identification, in particular to an automatic identification method of microseismic events based on inter-channel energy superposition. The method comprises the steps that a perforation signal first arrival time difference file deltati is calculated; multi-channel microseismic signals are corrected by using the first arrival time differencefile deltati; corrected multi-channel microseismic signal energy is summed to obtain a high signal-to-noise ratio model trace M(i); identification of the microseismic events is conducted by adopting an STA/LTA method based on a model trace energy envelope E(i). By means of the method, reliability and correctness of the automatic identification method of the microseismic events are improved aimingat defects of a conventional microseismic signal first arrival picking method.

Description

technical field [0001] The invention relates to the field of micro-seismic event identification, in particular to an automatic identification method for inter-trace energy superposition of micro-seismic events. Background technique [0002] Hydraulic fracturing is a well stimulation measure with wide application prospects, and it is also the main cause of microseismic events. The basic theory of hydraulic fracturing is: use the surface high-pressure pump to inject a large amount of pressure fluid into the fracturing well. When the injection speed of the pressure fluid exceeds the adsorption capacity of the oil layer, the pressure will continue to increase. When the pressure reaches a certain level, it will cause rocks to break or collapse. There are cracks growing, which in turn produce a series of observable microseismic events. Microseismic signals can be recorded by properly arranging geophones on the surface of the fractured well or in adjacent monitoring wells. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
CPCG01V1/288
Inventor 龙云宾康成王洪超陈祖斌王丽芝林君
Owner JILIN UNIV
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