Microseism event positioning method

A positioning method and micro-seismic technology, applied in seismic signal processing, seismology for logging records, etc., can solve the problems of no continuity, human error isotropic axis, and inability to pick up the first arrival, etc.

Active Publication Date: 2017-01-25
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
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Problems solved by technology

There are two problems: 1) Human error in picking first arrivals 2) When the signal-to-noise ratio is low, the microseismic event isotropy does not have good continuity, so it is impossible to pick the first arrivals

Method used

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  • Microseism event positioning method

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Embodiment Construction

[0085] The preferred embodiments are cited below, and the present invention is described in detail as follows.

[0086] combined with figure 1 , the specific process of this embodiment is:

[0087] A microseismic event location method, firstly determine the layered velocity model of the work area and the position of the geophone, determine the microseismic event signal, use the weighted superposition of the difference between the picked first arrival difference and the calculated first arrival difference between all geophone pairs As the objective function, the microseismic event is optimized and iteratively positioned. in,

[0088] The optimized iterative positioning process includes the following steps:

[0089] 1) Determine the initial microseismic position p 0 (x 0 ,y 0 ,z 0 ), and the iteration termination threshold d th ;

[0090] 2) Apply a certain grid to divide the space within the range of possible microseismic event locations;

[0091] 3) According to the ...

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Abstract

The invention provides a microseism event positioning method. The method includes: utilizing a rule that any two waveforms are mutually correlated; calculating pickup first arrival time difference; utilizing weighted stacking of differences between the pickup first arrival difference among all wave detector pairs and calculated first arrival difference as a target function to perform optimized iterative positioning on a microseism event. By the method, the problem that low signal-to-noise-ratio coaxial axis is discontinuous can be effectively overcome; by utilizing weighted stacking of the differences between the pickup first arrival difference among all wave detector pairs and the calculated first arrival difference as the target function, N(N-1)/2 combinations of wave detectors can be provided for an observation system containing N wave detectors, so that massive information redundancy is provided, and positioning accuracy of the microseism event is improved.

Description

[0001] method field [0002] The invention relates to the technical field of hydraulic fracturing microseismic monitoring, in particular to a method for locating microseismic events. Background technique [0003] Microseismic monitoring of oil and gas fields is a new seismic method mainly used in the development of oil and gas fields. It uses seismic waves generated by hydraulic fracturing, oil and gas extraction, conventional water injection and other petroleum engineering operations. The premise of conventional in-well microseismic event location is that it has a high signal-to-noise ratio and the isotropic axis of the microseismic event has good continuity. Under this premise, the matching degree of the first arrival of the microseismic event is used as the objective function for location. There are two problems: 1) the human error of first arrival picking; 2) when the signal-to-noise ratio is low, the isotropy of the microseismic event does not have good continuity, so the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/40G01V1/28
Inventor 陈雨茂左建军王延光武小杰魏国华
Owner CHINA PETROLEUM & CHEM CORP
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