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Three-component P-wave initial motion seismic focus mechanism inversion method and device

A focal mechanism, three-component technology, used in measurement devices, seismology, geophysical measurements, etc.

Active Publication Date: 2018-04-17
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
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Problems solved by technology

[0004] The inventors found that the current inversion method of the P-wave initial focal mechanism only uses the vertical component of the P-wave to solve the problem

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  • Three-component P-wave initial motion seismic focus mechanism inversion method and device

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Embodiment Construction

[0034] Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0035] The basic principle of the three-component P-wave initial motion focal mechanism is firstly introduced below.

[0036] For direction φ s , the sliding angle is λ, the inclination angle is δ, and the scalar moment is M 0 The earthquake source of , its moment tensor M can be expressed as:

[0037]

[0038] If the medium is a homogeneous medium and the source is at the origin of the coordinates, the expression of the far-field P-wa...

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Abstract

The invention provides a three-component P-wave initial motion seismic focus mechanism inversion method and device. The method may include the following steps: 1) three component P-wave initial motionsymbols are extracted from microseismic ground shallow well monitoring data; 2) symbol correction is performed on X and Y component P-wave initial motion symbols; 3) a seismic focus model is selected; according to the microseismic ground shallow well monitoring data, values of seismic focus model parameters are solved to determine a seismic focal mechanism solution; 4) lattice point dispersion isperformed in a seismic focal mechanism space; 5) lattice points in the seismic focal mechanism space are searched. In a searching process, a Z component P-wave initial motion symbol corresponding tothe seismic focal mechanism is calculated; 6) degrees of matching is calculated; and 7) the seismic focal mechanism corresponding to a component with a maximum degree of matching is selected as an inversion result. The inversion method and device disclosed in the present invention are used for constraining inversion of the seismic mechanism via three components at the same time, accuracy of inversion can be increased, and multiplicity of solutions of the inversion result can be reduced.

Description

technical field [0001] The invention relates to microseismic monitoring data processing technology, in particular to a three-component P-wave initial motion source mechanism inversion method and device. Background technique [0002] Hydraulic fracturing microseismic monitoring technology is an important means of monitoring hydraulic fracturing fractures during the development of unconventional reservoirs such as shale gas and tight gas. Obtaining the spatial distribution of hydraulic fracturing fractures through microseismic monitoring can provide important parameters for well pattern deployment and fracturing scheme optimization. [0003] At present, there are three monitoring methods for microseismic monitoring: surface monitoring, borehole monitoring and surface shallow well burying. The surface shallow well buried microseismic monitoring technology is a monitoring technology that uses sparse observation stations. Compared with ground monitoring methods, it reduces the ...

Claims

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Application Information

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IPC IPC(8): G01V1/50
CPCG01V1/50G01V2210/6169
Inventor 李宏杨心超朱海波
Owner CHINA PETROLEUM & CHEM CORP
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