Micro-seismic phase identification first picking method and device, and storage medium

A micro-seismic and seismic phase technology, applied in the field of seismic phase identification, can solve problems such as unsatisfactory initial arrival results and insignificant peak value of cross-correlation function, so as to improve fracturing construction efficiency, success rate, efficiency and accuracy Effect

Active Publication Date: 2020-01-14
CHINA PETROCHEMICAL CORP +3
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Problems solved by technology

However, when the signal-to-noise ratio of the microseismic records is low or there are multiple seismic phase signals, the peak of the cross-correlation function is not obvious or there are multiple peaks w...

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  • Micro-seismic phase identification first picking method and device, and storage medium
  • Micro-seismic phase identification first picking method and device, and storage medium
  • Micro-seismic phase identification first picking method and device, and storage medium

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Embodiment Construction

[0046] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation of the present invention will now be described in detail with reference to the accompanying drawings.

[0047] like figure 1 as shown, figure 1 It is a flow chart of the method for automatically identifying downhole microseismic events based on multi-channel scanning and stacking in the present invention.

[0048] refer to figure 1 , in step 110, using perforation records or seismic phase arrivals of strong energy event signals to establish arrival-time curve fitting formulas.

[0049] For a uniform velocity model and a vertically arranged observation system, the first-arrival curve of seismic waves received by geophones can be expressed as a parabola. When the monitoring distance r is much greater than the distance between geophones to the curve can be approximated as a linear curve

[0050] t=t 0 +K×dT×m

[0051] Among th...

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Abstract

The invention relates to a micro-seismic phase identification first picking method and device, and a storage medium. In the method, an energy-weighted similarity coefficient is calculated along a fitting curve for signal identification, a micro-seismic signal can be quickly and effectively identified; and based on a known seismic phase first arrival trend, a residual time difference correction value of a target seismic phase is calculated, a constraint time window is set, a situation that large errors occur in low-signal-to-noise-ratio channel record first picking can be effectively avoided, and first picking efficiency and accuracy are improved. The method, the device and the medium have important significance in improving fracturing construction efficiency and increasing a success rate of oil and gas reservoir transformation.

Description

technical field [0001] The present invention relates to the technical field of seismic phase identification, more specifically, to a first-arrival picking method for microseismic phase identification based on arrival-time curve fitting, a computer device, and a storage medium storing computer-readable instructions . Background technique [0002] The permeability of unconventional oil and gas reservoirs is extremely low, and horizontal wells and staged fracturing are required for reservoir stimulation during the production process. Microseismic monitoring technology can monitor the hydraulic fracturing process in real time, use the monitoring data to locate the induced microseismic events, describe the geometric shape and spatial distribution of fracturing fractures according to the distribution characteristics of fracturing event points, and evaluate the effect of fracturing and optimize the post-fracturing process. Fracture design and well location layout are of great sign...

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Application Information

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IPC IPC(8): G01V1/28G01V1/30G01V1/36
CPCG01V1/288G01V1/307G01V1/362G01V2210/322G01V2210/52G01V2210/63
Inventor 袁凯吉玉林郝玉芬胡光钟涛黄银闫秀梅舜豪胡泽文
Owner CHINA PETROCHEMICAL CORP
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