US 2019/0162867 A1 · METHOD AND SYSTEM FOR POSITIONING SEISMIC SOURCE IN MICROSEISM MONITORING

Abstract

The embodiments of the present application include acquiring a monitoring region and each observation point therein; partitioning the monitoring region into N layers of grids according to a seismic source positioning accuracy, wherein a side length of a grid cell of an i-th layer of grid is D/2i-1, i=1, . . . N, and D is an initial side length of the grid cell and not more than a double of a distance between the respective observation points; searching all nodes in a first layer of grid to acquire a node satisfying a preset condition therefrom; from i=2, determining and searching nodes satisfying a first preset requirement in the i-th layer of grid, to acquire a node satisfying the preset condition therefrom, until a search in an N-th layer of grid is completed, wherein a node satisfying the preset condition acquired in the N-th layer of grid is a seismic source point location.

Claims18

Dependent claims

A method for positioning a seismic source in microseism monitoring, comprising the steps of:

acquiring a monitoring region and each observation point therein;
partitioning the monitoring region into N layers of grids according to a seismic source positioning accuracy, wherein a side length of a grid cell of an i-th layer of grid is D/2i-1, i=1, . . . N, and D is an initial side length of the grid cell and not more than a double of a distance between the respective observation points;
searching all nodes in a first layer of grid to acquire a node satisfying a preset condition therefrom;
from i=2, determining and searching nodes satisfying a first preset requirement in the i-th layer of grid, to acquire a node satisfying the preset condition therefrom, until a search in an N-th layer of grid is completed, wherein a node satisfying the preset condition acquired in the N-th layer of grid is a seismic source point location, and the first preset requirement is falling within a circle centered on a node satisfying the preset condition in the (i−1)-th layer of grid with a radius of √{square root over (2)}×D/2i-1.

1 more element

A method for positioning a seismic source in microseism monitoring, comprising the steps of:

acquiring a monitoring region and each observation point therein;
partitioning the monitoring region into N layers of grids according to a seismic source positioning accuracy, wherein a side length of a grid cell of an i-th layer of grid is D/2i-1, i=1, . . . N, and D is an initial side length of the grid cell and not more than a double of a distance between the respective observation points;
searching all nodes in a first layer of grid to acquire a node satisfying a preset condition therefrom;
when i=2, determining and searching nodes satisfying a first preset requirement in the i-th layer of grid, to acquire a node satisfying the preset condition therefrom, wherein the first preset requirement is falling within a circle centered on a node satisfying the preset condition in the (i−1)-th layer of grid with a radius of √{square root over (2)}×D/2i-1;
from i=3, determining and searching nodes satisfying a second preset requirement in the i-th layer of grid, to acquire a node satisfying the preset condition therefrom, until a search in an N-th layer of grid is completed, wherein a node satisfying the preset condition acquired in the N-th layer of grid is a seismic source point location;
and the second preset requirement is falling within a circle centered on a node satisfying the preset condition in the (i−2)-th layer of grid with a radius of √{square root over (2)}×D/2i-1, and simultaneously falling within the circle centered on the node satisfying the preset condition in the (i−1)-th layer of grid with the radius of √{square root over (2)}×D/2i-1.

3 more elements

A method for positioning a seismic source in microseism monitoring, comprising the steps of:

(1) acquiring a monitoring region and each observation point therein;
(2) performing a first layer of grid partitioning for the monitoring region according to a preset initial side length D of a grid cell, and searching all nodes therein to acquire a node satisfying a preset condition, wherein the initial side length is not more than a double of a distance between the respective observation points;
(3) judging whether the side length of a current grid cell satisfies a seismic source positioning accuracy, and if the judgement is No, from i=2, performing an i-th layer of grid partitioning for the monitoring region by taking the side length of the grid cell as D/2i-1, wherein i=2, 3, 4 . . . ;
(4) searching nodes satisfying a first preset requirement in the i-th layer of grid, to acquire a node satisfying the preset condition therefrom, the first preset requirement being falling within a circle centered on a node satisfying the preset condition in the (i−1)-th layer of grid with a radius of √{square root over (2)}×D/2i-1, and repeating steps (3) and (4) until the judgement in step (3) is Yes;
at that time, a node satisfying the preset condition in the i-th layer of grid is a seismic source point.

2 more elements

A method for positioning a seismic source in microseism monitoring, comprising the steps of:

(1) acquiring a monitoring region and each observation point therein;
(2) performing a first layer of grid partitioning for the monitoring region according to a preset initial side length D of a grid cell, and searching all nodes therein to acquire a node satisfying a preset condition, wherein the initial side length is not more than a double of a distance between the respective observation points;
(3) performing a second layer of grid partitioning for the monitoring region by taking the side length of the grid cell as D/2i-1, wherein i=2, and searching nodes satisfying a first preset requirement in the second layer of grid to acquire a node satisfying the preset condition therefrom;
wherein the first preset requirement is falling within a circle centered on a node satisfying the preset condition in the (i−1)-th layer of grid with a radius of √{square root over (2)}×D/2i-1;
(4) judging whether the side length of a current grid cell satisfies a seismic source positioning accuracy, and if the judgement is No, from i=3, performing an i-th layer of grid partitioning for the monitoring region by taking the side length of the grid cell as D/2i-1, wherein i=3, 4 . . . ;
(5) searching nodes satisfying a second preset requirement in the i-th layer of grid, to acquire a node satisfying the preset condition therefrom, the second preset requirement being falling within a circle centered on a node satisfying the preset condition in the (i−2)-th layer of grid with a radius of √{square root over (2)}×D/2i-2, and simultaneously falling within the circle centered on the node satisfying the preset condition in the (i−1)-th layer of grid with the radius of √{square root over (2)}×D/2i-1;
and repeating steps (4) and (5) until the judgement in step (4) is Yes;
at that time, a node satisfying the preset condition in the i-th layer of grid is a seismic source point.

5 more elements

Dependencies are inferred from the claim text.

Method and system for positioning seismic source in microseism monitoring

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Method and system for positioning seismic source in microseism monitoring

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Abstract

Claims18