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Regional stress field temporal-spatial variation inversion method

A technology of time-space variation and stress field, applied in measurement devices, instruments, scientific instruments, etc., can solve problems such as inability to obtain high-resolution stress distribution, stress variation with time, and limited number of events

Inactive Publication Date: 2018-03-16
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0004] At present, most of the existing technologies obtain the focal mechanism based on clear signal inversion, so the number of events is very limited, and it is impossible to obtain high-resolution stress distribution, let alone the change of stress with time

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  • Regional stress field temporal-spatial variation inversion method
  • Regional stress field temporal-spatial variation inversion method
  • Regional stress field temporal-spatial variation inversion method

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[0054] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0055] Such as figure 1 As shown in , an inversion method for regional stress field spatio-temporal variation includes the following steps:

[0056] Step 1. Design a microseismic monitoring system for seismic data acquisition;

[0057] Step 2, performing preprocessing operations of bandpass filtering and static correction on the raw data collected in step 1;

[0058] Step 3. Perform joint inversion of microseismic location and focal mechanism on the preprocessed data to obtain the spatial location and focal mechanism of the microseismic event;

[0059] Step 4. Divide the microseismic events into multiple time periods according to the time of the earthquake, and invert the stress distribution maps of different time periods according to the spatial posi...

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Abstract

The invention discloses a regional stress field temporal-spatial variation inversion method. The method comprises the following steps that: a microseism monitoring system is designed to collect data;collected original data are preprocessed; the pre-processing data are applied to microseism positioning and focal mechanism joint inversion; microseism events are divided into a plurality of time periods according to the time of earthquake commencement, the spatial locations and focal mechanisms of the microseism events in the different time periods are subjected to inversion, so that the stress distribution diagrams of the plurality of time periods can be obtained; and the stress distribution diagrams of the plurality of time periods are combined, so that the temporal-spatial variation of stress can be obtained. According to the method of the invention, the locations and focal mechanisms of more widely distributed and more accurate microseism events are obtained based on a multi-parameterjoint-scanning algorithm; on the basis of the microseism events obtained through the multi-parameter joint-scanning algorithm, a study area is decomposed into a plurality of sub-areas, each sub-areacontains at least two seismic events; the stress tensors of all sub-areas are subjected to joint inversion, so that the spatial distribution of the stress of the whole area can be obtained; and microseisms at different time are subjected to inversion, so that the change of the stress over time can be analyzed.

Description

technical field [0001] The invention relates to the technical field of microseismic monitoring, in particular to an inversion method for temporal and spatial changes of regional stress fields. Background technique [0002] Microseismic monitoring is currently one of the most accurate, timely and informative monitoring methods in reservoir fracturing. The focal mechanism of microseismic is not only related to the geometry of fractures, but also reflects the stress environment. The focal mechanism of an earthquake can effectively explain the physical properties of the source and can indicate the regional or local stress and strain distribution. Combined with the surrounding geological conditions, the fracturing effect can be systematically and accurately evaluated. [0003] With the improvement of microseismic monitoring technology, joint inversion of microseismic focal location and focal mechanism has become possible. In particular, the determination of the microseismic fo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
CPCG01V1/288
Inventor 梁春涛余洋洋
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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