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Joint inversion method of source location and source mechanism using p-wave initial motion constraints

A technology of source mechanism and source location, applied in seismic signal processing and other directions, can solve the problems of weakened superposition effect, identification of unfavorable microseismic events, and high noise level, and achieve the effect of improving inversion accuracy, computational accuracy and computational efficiency.

Active Publication Date: 2019-08-27
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] When the seismic record superposition function is used as the inversion objective function, if the microseismic focal mechanism is a double-force couple type, it appears on the ground that the initial motion polarity of the P wave is distributed in four quadrants, that is, there are positive and negative regions. If the superposition calculation is performed, the positive and negative signals may cancel each other out, weakening the superposition effect
In addition, if the recorded absolute value is used for stacking, the noise part will also turn into a positive value, which makes the stacking result have a high noise level, which is not conducive to the identification of microseismic events

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  • Joint inversion method of source location and source mechanism using p-wave initial motion constraints
  • Joint inversion method of source location and source mechanism using p-wave initial motion constraints

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Embodiment Construction

[0029] 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.

[0030] The present disclosure proposes a joint inversion method of source location and source mechanism using P-wave initial motion constraints, which includes the following steps:

[0031] Carry out grid point discretization on the source location space and the source mechanism space;

[0032] Search the grid points of all source parameters;

[0033] Seismic records are corrected using focal mechanisms;

[0034] Search for the source loc...

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Abstract

The invention belongs to microseism monitoring data processing technique and discloses a focus positioning and focus mechanism joint inversion method utilizing P wave first motion constraint. The method includes steps of performing lattice point dispersion on a focus position space and a focus mechanism space; searching all lattice points of focus parameters; correcting a seismic record by utilizing the focus mechanism; searching the focus position; outputting focus parameter results after searching is over. According to the invention, aiming at double-couple focus parameter inversion in ground microseism, the focus positioning and the focus mechanism are put in joint inversion for searching and solving. P wave first motion polarity corresponding to the focus mechanism is utilized for correcting the seismic record and constraining focus positioning. In this way, the inversion precision of the focus positioning and the focus mechanism can be improved at the same time. At the same time,optimization is made on calculation of the P wave first motion polarity in positioning and searching, so that calculation precision and calculation efficiency are improved substantially.

Description

technical field [0001] The invention belongs to hydraulic fracturing micro-seismic monitoring data processing technology, and is a method for joint inversion of source position and source mechanism by using P-wave initial motion constraints in a micro-seismic ground monitoring mode. 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. The ground monitoring method can provide a better observation angle and obtain higher positioning accuracy than the well monitoring method. [0003] However, due to surface noise interference, the signal is more complicated. The signal-to-noise ratio of the data obtai...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
Inventor 李宏杨心超朱海波
Owner CHINA PETROLEUM & CHEM CORP
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