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Hydraulic fracturing monitoring method based on array deconvolution treatment

A hydraulic fracturing and deconvolution technology, applied in the exploration and development of oil, gas and geothermal resources

Inactive Publication Date: 2014-07-16
NANJING UNIV
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Problems solved by technology

This method is very effective for the localization of the source of the explosion mechanism, but the microseismic source energy is mostly double cuple or nonlinear, which leads to certain limitations of this method

Method used

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  • Hydraulic fracturing monitoring method based on array deconvolution treatment
  • Hydraulic fracturing monitoring method based on array deconvolution treatment
  • Hydraulic fracturing monitoring method based on array deconvolution treatment

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specific Embodiment

[0024] The present invention will now be described in a clear and detailed manner. Although the described embodiments are not all steps, according to the following described embodiments, those skilled in the art can complete real microseismic monitoring work without creative efforts. The implementation steps are attached figure 2 , 3 , 4, where the same number always indicates the same data module or processing module. Specific embodiments of the present invention include the following steps:

[0025] Step (1), carry out conventional processing (102) to raw seismic record (101): process waveform data with conventional digital signal processing techniques including de-zero drift, de-DC, de-linear trend, and filtering, to improve the signal quality of seismic data. Then, use the method of STA / LTA average energy ratio of short and long time windows [reference Freiberger, W.F. (1963)], waveform cross-correlation method [reference van Trees, H.L. (1968)], or other methods to de...

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Abstract

The invention is applied to development of underground resources such as shale gas, tight sandstone gas and terrestrial heat, and provides a method for monitoring rock failures caused by hydraulic fracturing. The method comprises the steps that a scattering coefficient related to a micro earthquake focal mechanism and a Green function from a focus to all wave detectors are obtained through array deconvolution treatment; the obtained Green function is subjected to continuation or offset, so that an underground monitoring area pseudo wave field in an earthquake-triggering period is obtained; the spatial position of the micro earthquake focus is picked up according to the change of maximum energy of the wave field; the moment tension of the focal mechanism is searched for according to the position of the focus and the scattering coefficient related to the focal mechanism and can be used for analysis of the focal mechanism. By means of the method, the position and the focal mechanism of a micro earthquake caused by fracturing can be obtained.

Description

technical field [0001] The invention relates to the field of seismic exploration and is applied to the exploration and development of oil and gas and geothermal resources. Specifically, the present invention is used to monitor the microseismic formation of hydraulically fractured rocks, and measure parameters such as the spatial location and fracture mechanism of rock fractures. Background technique [0002] Over the past two decades, with the increasing demand for energy and the continuous development of science and technology, hydraulic fracturing has been widely used in the exploration and development of shale gas, tight sandstone gas, geothermal, and other underground resources. Hydraulic fracturing refers to pressing high-pressure fluid (water, carbon dioxide or other mixed fluids) into underground rock formations rich in resources, causing the rock to break and expand the original fracture system of the rock or form a new fracture system for the precipitation and relea...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/30
Inventor 王攀王良书
Owner NANJING UNIV
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