Ground array type micro seismic data independent component separation denoising method

A technology of seismic data and independent components, applied in seismic signal processing and other directions, can solve the problem of low signal-to-noise ratio and achieve the effect of improving signal-to-noise ratio

Inactive Publication Date: 2015-11-25
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0003] The purpose of the present invention is to provide a ground array microseismic data independent component separation and denoising method for the relatively low signal-to-noise ratio of the ground array microseismic data according to the characteristics of the ground array microseismic monitoring observation system and microseismic data.

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  • Ground array type micro seismic data independent component separation denoising method
  • Ground array type micro seismic data independent component separation denoising method
  • Ground array type micro seismic data independent component separation denoising method

Examples

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Embodiment 1

[0022] Example 1. A method for separating and denoising independent components of ground array microseismic data, comprising the following steps:

[0023] (1) According to the principle of similarity of microseismic data, the similarity grouping processing of ground array microseismic data is carried out and imported at the same time. The microseismic data similarity is the similarity of the waveforms in the time domain and frequency domain of the microseismic signal.

[0024] (2) De-DC component processing and whitening processing are performed on the microseismic data respectively, so as to realize the second-order statistical independence of the microseismic effective signal component and the microseismic noise component in the ground array microseismic data.

[0025] (3) Negative entropy is used as the independent judgment condition of microseismic effective signal component and microseismic noise component, and the Newton iteration method is used to optimize the solution...

Embodiment 2

[0028] Example 2. like figure 1 shown, figure 1 This is a flowchart of the method for separating and denoising independent components of ground array microseismic data in this embodiment.

[0029] In step 101, according to the characteristics of the ground array type microseismic monitoring and observation system and the microseismic data, first, all monitoring geophone tracks are divided into central monitoring geophone tracks and surrounding geophone tracks; secondly, a central monitoring geophone track is determined, According to the principle of similarity of microseismic data, compare all surrounding monitoring geophone traces with the determined central monitoring geophone trace in one-to-one correspondence. If the surrounding monitoring geophone trace and the determined central monitoring geophone trace satisfy the similarity If the range conditions are met, the surrounding monitoring geophone traces and the determined central monitoring geophone traces are grouped in...

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Abstract

The invention discloses a ground array type micro seismic data independent component separation denoising method, comprising the steps of performing packet processing for close demodulator channels according to the similarity principle of micro seismic data; performing DC component and whitening processing for packets of seismic data; using negative entropy as independence determination conditions of a micro seismic effective signal component and a micro seismic noise component, using the Newton iterative method for an optimization solution, and achieving the uncertainty separation of the components; and performing cross-correlation processing between the two components after uncertainty separation and original micro seismic data, and achieving the certainty separation of the micro seismic effective signal component from the micro seismic noise component through the magnitude and sign of a cross-correlation numerical value. The invention can be used for dramatically improving the signal to noise ratio of ground array type micro seismic data, achieving accurate identification of effective events in the micro seismic data, and improving the accuracy of micro seismic fracturing monitoring results.

Description

technical field [0001] The invention relates to a wave field separation and processing technology for microseismic data in oil and gas geophysical exploration, in particular to a ground array type microseismic data independent component separation and denoising method. Background technique [0002] The effective reservoirs of unconventional oil and gas resources in the world are widely distributed and thick, and have the potential to stabilize long-term production capacity. However, the physical properties of unconventional oil and gas reservoirs with low porosity and low permeability determine their great difficulty in exploitation. Hydraulic fracturing is an effective method for the exploitation of unconventional oil and gas resources by improving the fracture system between the wellbore and the formation fractures, increasing the seepage channels, and improving the effective permeability and productivity. As far as the current technology is concerned, microseismic monito...

Claims

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Application Information

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IPC IPC(8): G01V1/36
Inventor 刁瑞芮拥军王延光王兴谋李强张珺怡冯玉苹王蓬
Owner CHINA PETROLEUM & CHEM CORP
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