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EnKF microearthquake event position inversion method based on perforation restraint

A microseismic and event technology, applied in seismology, seismic signal processing, measurement devices, etc., can solve the problems of microseismic event location far away from the real event location, increasing inversion problem ill-posedness, etc.

Active Publication Date: 2015-07-15
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

However, it also optimizes more parameters, thus increasing the ill-posedness of the inversion problem, e.g. it tends the optimization problem to have multiple solutions
Therefore, the above method may make the calculated microseismic event location far away from the real event location, that is, the outlier

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  • EnKF microearthquake event position inversion method based on perforation restraint
  • EnKF microearthquake event position inversion method based on perforation restraint
  • EnKF microearthquake event position inversion method based on perforation restraint

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Embodiment Construction

[0039] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0040] According to an embodiment of the present invention, an EnKF microseismic event location inversion method based on perforation constraints includes the following steps: (1) establishing a velocity field; (2) selecting the k-th event point; (3) solving Get the first arrival travel time of the event point received by the j-th geophone (where j=1,..., Nr, Nr represents the total number of geophones) by the equation; (4) Apply the collective Kalman filter method Fit the first arrival travel time calculated in step (3) with...

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Abstract

The invention discloses an EnKF microearthquake event position inversion method based on a perforation restraint. The EnKF microearthquake event position inversion method comprises the following steps of: (1) building a speed field; (2) selecting a kth event point; (3) acquiring first arrival traveling time of the event point received by a jth detector through a solving eikonal equation; (4) fitting the first arrival traveling time obtained in the step (3) with first arrival traveling time which is actually received by the jth detector; and (5) checking whether the traveling time of the event point received by each detector is completely fitted, if the traveling time of the event point received by each detector is not completely fitted, returning to the step (3), and adding 1 to a variable j to fit the (j+1)th detector, otherwise, finishing event positioning.

Description

Technical field [0001] The invention belongs to the field of petroleum and natural gas seismic exploration, and is mainly applied to microseismic monitoring of petroleum seismic exploration. Specifically, the invention relates to an inversion method capable of more accurately determining the location of microseismic events. Background technique [0002] In microseismic fracturing, we can get the first arrival travel time of the P wave and S wave of each event received by each geophone. With the three-component detector, the azimuth of the event can be obtained from the vector diagram. The travel of P wave and S wave contains the distance information from the event location to the detector, such as the time of the event. The azimuth angle obtained from the vector diagram gives the azimuth information of the event location. Here we use the vector d obs To represent the measured data vector, including the vertical and horizontal wave travel time and azimuth angle of each event rec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/00G01V1/28
Inventor 尹陈刘鸿李亚林何光明巫芙蓉陈爱萍康亮巫骏
Owner BC P INC CHINA NAT PETROLEUM CORP
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