A Simultaneous Inversion Method of Microseismic Source Location and Velocity Model

A velocity model and microseismic technology, applied in seismic signal processing and other directions, can solve problems such as unfavorable shallow velocity inversion, and achieve the effect of improving inversion accuracy, high positioning accuracy, and strong inversion stability

Active Publication Date: 2018-03-09
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0006] However, the method of Zhang (2003) basically overlaps the ray paths in the shallow layer when constructing the tomographic equation, which is not conducive to shallow layer velocity inversion

Method used

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  • A Simultaneous Inversion Method of Microseismic Source Location and Velocity Model
  • A Simultaneous Inversion Method of Microseismic Source Location and Velocity Model
  • A Simultaneous Inversion Method of Microseismic Source Location and Velocity Model

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Embodiment Construction

[0048] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0049] joint tomographic equations

[0050] 1) Ordinary tomographic equation: actual observed travel time from microseismic event i to receiving point k

[0051]

[0052] where u is the slowness field (reciprocal of velocity), τ i is the moment of shock. When locating a microseismic, the source coordinates (x 1 , x 2 , x 3 ), the seismic moment and the slowness field are all unknown parameters.

[0053] The time of arrival received by the geophone (P wave or S wave), using the test source location, the moment of shock generation and the initial velocity model (prior information) to calculate the theoretical arrival time The residual between the two travel times is

[0054] Calculate travel time and observe travel time residuals The perturbation of the source and velocity models can be approximated linearly as

[0055]

[0056] Among them, the sour...

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Abstract

The invention provides a simultaneous inversion method of microseismic source position and velocity model, which belongs to the field of seismic source positioning in microseismic monitoring. The method includes: (1), picking up the first arrival time of the microseismic event; (2), using the acoustic logging data, constructing an initial velocity model, and then obtaining the initial source position and the time of the earthquake of the microseismic event; (3), Calculate the theoretical travel time of the microseismic event based on two-point ray tracing, and construct a joint tomographic equation set; (4), solve the joint tomographic equation set, and calculate the parameter update quantities δu, Δx, and Δτ; (5) judge whether to satisfy Termination condition, if yes, then go to step (6), if not, then use the parameter update amount to update the velocity model, hypocentral location and seismic moment, and then return to step (3); (6), output the final Velocity model, source location and moment of earthquake occurrence.

Description

technical field [0001] The invention belongs to the field of seismic source positioning in microseismic monitoring, and in particular relates to a simultaneous inversion method of microseismic source position and velocity model, which uses travel time information of microseismic events to simultaneously invert the seismic source position and velocity model. Background technique [0002] Microseismic monitoring technology is a new unconventional technology developed and active in the 1990s. It can be applied to many fields such as oil and gas reservoir development, mine monitoring, and geological disaster monitoring. In microseismic monitoring, the location of the hypocenter, the moment of occurrence, the strength of the hypocenter and the velocity model are all unknown, and determining these parameters is the primary task of microseismic monitoring. [0003] In the microseismic location, since the source position and the velocity model are both unknown quantities, the two ar...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
Inventor 程磊磊崔树果姜宇东
Owner CHINA PETROLEUM & CHEM CORP
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