Describing Method of Fracture Scale Based on Seismic Wave Dynamic Parameters

A technology of dynamic parameters and wave mechanics, applied in seismology, seismic signal processing, scientific instruments, etc., can solve problems such as inability to characterize wellbore deformation, inability to determine the specific size of fractures, etc., to avoid construction risks, improve pertinence and effectiveness performance and reduce 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 Seismic Wave Dynamic Parameters
  • Describing Method of Fracture Scale Based on Seismic Wave Dynamic Parameters
  • Describing Method of Fracture Scale Based on Seismic Wave Dynamic Parameters

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Embodiment Construction

[0030] Hereinafter, the method for describing the fracture scale based on seismic wave dynamics parameters of the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0031] The invention provides a description method of crack rupture scale based on seismic wave dynamic parameters.

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

[0033] S1: The inversion threshold X can be calculated by formula 1 a , the formula 1 is:

[0034]

[0035] Among them, X a is the inversion threshold calculated by using the a-th dynamic parameter, a is the serial number of the calculated dynamic parameter, and n represents P wave (seismic longitudinal wave), SV wave (vertically polarized transverse wave), and SH wave (horizontally polarized transverse wave) At least one of, P includes at least one of main frequency, period, and bandwidth...

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Abstract

The invention provides a description method of crack rupture scale based on seismic wave dynamic parameters. 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 microseismic wave, and fit the synthetic microseismic wave with the microseismic wave recorded by the observation station based on the dynamic characteristics of the seismic wave to obtain the inversion threshold value, and select the inversion threshold value within the preset threshold allowable range The crack rupture scale recorded by the synthetic microseismic waves in the system 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 rupture scale of artificial fracturing fractures cannot be described quantitatively.

Description

technical field [0001] The invention relates to the technical field of seismic monitoring, in particular to a method for describing crack rupture scales based on seismic wave dynamic parameters. 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 volume and connect...

Claims

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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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