Description method of the crack fracture scale based on seismic wave full-waveform characteristics

A seismic wave and full waveform technology, applied in seismology, seismic signal processing, geophysical measurement, etc., can solve problems such as inability to characterize wellbore deformation, inability to determine the specific size of fractures, etc., to avoid construction risks and improve pertinence and effectiveness , Reduce the effect of fracturing loss

Active Publication Date: 2020-12-11
SOUTHWEAT UNIV OF SCI & TECH +1
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Problems solved by technology

Microseismic monitoring found that there are microseismic events with a linear distribution trend nearby, but the specific size of the fractures cannot be determined, and the rare microseismic events cannot indicate whether the fractures penetrate the wellbore and cause wellbore deformation

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  • Description method of the crack fracture scale based on seismic wave full-waveform characteristics
  • Description method of the crack fracture scale based on seismic wave full-waveform characteristics
  • Description method of the crack fracture scale based on seismic wave full-waveform characteristics

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Embodiment Construction

[0030] In the following, the method for describing the scale of fracture rupture based on the full waveform characteristics of seismic waves of the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0031] The invention provides a method for describing the fracture scale based on the full waveform characteristics of seismic waves.

[0032] In an exemplary embodiment of the present invention, the description method of the fracture scale may include the following steps:

[0033] S1: The correlation coefficient H can be calculated by formula 1, which is:

[0034]

[0035] Among them, H is the correlation coefficient, k is the serial number of the observation station, K is the total number of observation stations involved in the calculation, a n is the respective cross-correlation weight coefficient of P wave, SV wave and SH wave, n represents at least one of P wave, SV wave and SH wave, t 1 is the start time...

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Abstract

The invention provides a description method of the crack fracture scale based on seismic wave full-waveform characteristics. The description method of the crack fracture scale comprises the followingsteps: generating a composite seismic source time function through modeling of the crack fracture scale, obtaining a Green function from a seismic source to an observation station through logging and/or three-dimensional seismic data, obtaining a synthetic micro seismic wave according to the composite seismic source time function, the Green function and a seismic moment tensor, and obtaining a composite micro seismic wave; calculating correlation coefficients of the synthetic microseismic waves and the microseismic waves recorded by the observation station based on the full waveform characteristics of the seismic waves, and selecting the fracture fracture scale recorded by the synthetic microseismic waves with the correlation coefficients within a preset coefficient allowable range as thefracture scale. The invention has the beneficial effects that the problem that the fracture dimension of the crack cannot be quantitatively described in passive earthquake monitoring can be solved.

Description

technical field [0001] The invention relates to the technical field of seismic monitoring, in particular to a method for describing the scale of crack rupture based on the full waveform characteristics of seismic waves. Background technique [0002] The development of low-permeability unconventional oil and gas resources represented by shale gas requires the use of hydraulic fracturing and other related industrial technologies to inject a large amount of fracturing fluid into the formation at high pressure to form fractures, and to increase the permeability of rock formations to achieve low permeability such as shale gas. Economies of scale extraction of oil and gas resources. [0003] Fractures are important channels for the circulation of fluids (oil, gas, water, etc.), and the spatial shape and scale of fractures play completely different roles in the process of oil and gas development. [0004] Micro-scale or small-scale fractures become oil and gas seepage / flow channel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/303G01V2210/6222
Inventor 尹陈余长城
Owner SOUTHWEAT UNIV OF SCI & TECH
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