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EnKF microearthquake event position inversion method based on perforation restraint

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

Active Publication Date: 2013-01-16
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 following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0040] According to an embodiment of the present invention, a kind of EnKF microseismic event location inversion method based on perforation constraint comprises the following steps: (1) establish velocity field; (2) select the kth event point; (3) by solving The eigenfunction equation obtains the first arrival travel time of the event point received by the jth geophone (wherein, j=1, ..., Nr, Nr represents the total number of geophones); (4) apply the ensemble Kalman filter method Fit the first arrival travel time calculated in ste...

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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 the microseismic monitoring of petroleum seismic exploration. Specifically, the invention relates to an inversion method capable of more accurately determining the position of microseismic events. Background technique [0002] In microseismic fracturing, we can get the first-arrival travel time of P-wave and S-wave for each event received by each geophone. With a three-component geophone, the azimuth of the event can be obtained from the vector diagram. P-wave and S-wave travel times contain information about the distance from the location of the event to the detector, such as when the event occurred. The azimuth obtained from the vector diagram gives the azimuth information of the event location. Here we use the vector d obs to represent the measurement data vector, including the P-wave traveltime and azimuth angle of each event received by...

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Application Information

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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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