Micro-seismic source location and velocity model simultaneous inversion method

A velocity model, microseismic technology, applied in seismic signal processing and other directions, can solve problems such as unfavorable shallow velocity inversion

Active Publication Date: 2016-05-18
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 wh

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  • Micro-seismic source location and velocity model simultaneous inversion method
  • Micro-seismic source location and velocity model simultaneous inversion method
  • Micro-seismic source location and velocity model simultaneous inversion method

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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] t k i = τ i + T k i = τ i + ∫ i k uds - - - ( 1 )

[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), us...

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Abstract

The invention provides a micro-seismic source location and velocity model simultaneous inversion method, and belongs to the field of source locating in micro-seismic monitoring. The method comprises the following steps: (1) picking up the first arrival time of a micro-seismic event; (2) building an initial velocity model based on acoustic logging data, and acquiring the initial source location and origin time of earthquake of the micro-seismic event; (3) calculating the theoretical travel time of the micro-seismic event based on two-point ray tracing, and building a joint tomography equation set; (4) solving the joint tomography equation set, and working out the parameter update amount delta(u), delta(x) and delta(tau); (5) judging whether termination conditions are met, turning to step (6) if the termination conditions are met, or, using the parameter update amount to update the velocity model, the source location and the origin time of earthquake and turning to step (3); and (6) outputting the final velocity model, source location and origin time of earthquake.

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