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Describing Method of Fracture Scale Based on Full Waveform Characteristics of Seismic Waves

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

Active Publication Date: 2022-03-18
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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  • Describing Method of Fracture Scale Based on Full Waveform Characteristics of Seismic Waves
  • Describing Method of Fracture Scale Based on Full Waveform Characteristics of Seismic Waves
  • Describing Method of Fracture Scale Based on Full Waveform Characteristics of Seismic Waves

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Embodiment Construction

[0030] Hereinafter, the method for describing the crack rupture scale 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 of crack r...

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Abstract

The invention provides a method for describing the fracture scale based on the full waveform characteristics of seismic waves. The description method of the crack rupture scale includes: generating a composite source time function by modeling the crack rupture scale, obtaining the Green's function from the source to the observation station through well logging and / or 3D seismic data, and according to the composite source time function and Green's function and the seismic moment tensor to obtain the synthetic micro-seismic wave, calculate the correlation coefficient based on the full waveform characteristics of the synthetic micro-seismic wave and the micro-seismic wave recorded by the observation station, and select the synthetic micro-seismic wave whose correlation coefficient is within the allowable range of the preset coefficient. The fracture rupture scale of is used as the fracture rupture scale. The beneficial effects of the present invention may include: being able to solve the difficult problem that the fracture scale cannot be quantitatively described in passive seismic monitoring.

Description

technical field [0001] The invention relates to the technical field of seismic monitoring, in particular to a method for describing the fracture scale 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 channels. The v...

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Application Information

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Patent Type & Authority Patents(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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