Wave packet superposition microseism ground location method

A positioning method, microseismic technology, applied in positioning, radio wave measurement system, measuring device, etc., to achieve the effect of improving accuracy

Active Publication Date: 2013-11-20
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0003] Aiming at the problems of the traditional energy stacking positioning method in the use of ground microseismic data, the present invention proposes a microseismic ground positioning method based on multi-constraint wave packet stacking, through microseismic records root mean square amplitude outer envelope stacking The method solves the...

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  • Wave packet superposition microseism ground location method
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  • Wave packet superposition microseism ground location method

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Embodiment Construction

[0011] Embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0012] figure 1 It is a flow chart showing a wave packet stacking microseismic ground positioning method based on multiple constraints according to an embodiment of the present invention.

[0013] The original data of the wave packet stacking microseismic ground positioning method are: microseismic data S with n sampling points and m seismic traces g (i, j), wherein, i=1, 2, ... m, j = 1, 2, ... n.

[0014] refer to figure 1 , in step 101, the subsurface model is gridded with grids of a predetermined size according to the conditions of the work area (that is, the subsurface model network is divided into multiple grids, each grid has a predetermined size), and the number of iterations of the calculation cycle is given Threshold for alpha and outer envelope superposition values. After the model is gridded, it is assumed that microseismic events (significan...

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Abstract

The invention relates to a wave packet superposition microseism ground location method. The method comprises the following steps of (a) dividing a model into a plurality of grids, and giving a threshold value for a number of iteration and an external enveloping superposition value; (b) selecting a detector, calculating a time for a microseism event in a designated grid to reach each designated detector, and correcting the time difference; (c) getting a root-mean-square amplitude of the corrected signal of the detector, solving external envelop, and adding the external envelops together to get an external enveloping superposition channel; (d) changing the grid, calculating the external enveloping superposition channel of the detector in a novel designated grid, traversing all grids to get the external enveloping superposition channel set; (e) picking up the microseism event on the external enveloping superposition channel set, and determining a position of the microseism; (f) calculating a signal-to-noise ratio of the picked microseism event; (g) repeating the steps of (b) to (f) until meeting the number of the iteration to obtain multiple microseism event positions, and counting the percentage of the times on each position in the total times; and (h) determining the microseism event exceeding the threshold value as a microseism valid event.

Description

technical field [0001] The invention relates to geophysical prospecting microseismic positioning technology, more specifically, relates to a wave packet superposition microseismic ground positioning method based on multiple constraint conditions. Background technique [0002] In the processing of microseismic data, the key step is to accurately pick up effective microseismic events, and the ultimate goal is to accurately locate the position of effective microseismic events, so as to perform fracture prediction. The microseismic positioning in the well is mainly to determine the hypocenter location by picking up the first arrival waves of effective events and using the first arrival time to perform inversion. However, for the microseismic data received on the ground, the energy of the effective signal is weak and completely submerged in the noise. The signal-to-noise ratio of the microseismic section is extremely low, and it is impossible to pick up the first arrival of the m...

Claims

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Application Information

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IPC IPC(8): G01S5/20
Inventor 康亮尹陈刘鸿李亚林何光明巫芙蓉陈爱萍巫骏
Owner BC P INC CHINA NAT PETROLEUM CORP
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