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Microseism focus positioning method based on double-difference method

A technology of source location and microseismic, applied in the field of petroleum geophysical exploration, can solve the problems of high signal-to-noise ratio data, sensitive pick-up and high data requirements

Inactive Publication Date: 2016-04-20
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

The advantage of the double-difference positioning method is to locate the event by receiving the travel time difference of the two geophones, but it has high requirements for data and is sensitive to the first-arrival pickup, so it needs to have a high signal-to-noise ratio So far, it has not been well applied in microseismic monitoring

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Embodiment Construction

[0065] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0066] According to the present invention, the micro-seismic signal has similar source mechanism and signal characteristics as the natural seismic signal. Analyze the characteristics of its microseismic data: the distribution of event sources is concentrated, and the distance between events is much smaller than the distance to the geophone. The perforation event is selected as the main event, and the observed travel time of the microseismic event is picked up. The residuals ("double differences") of the observed and theoretically calculated traveltime differences of holes and events determine their relative distances.

[0067] Such as Figure 11 As shown, the concrete implementation steps of this method are:

[0068] (0) Read in the layered velocity file around the fracturing well, the coordinate values ​​of each geophone, the initial coordinate value relative to th...

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Abstract

The invention provides a microseism focus positioning method based on a double-difference method, and belongs to the field of geophysical prospecting of petroleum. The microseism focus positioning method selects a perforation event as the main event, and picks the observation travel time for a microseism event, and can determine the relative distance between the perforation and the microseism event by calculating the residual error (double difference) between the observation travel time of the perforation and the microseism event and the theoretically calculated travel time difference. The microseism focus positioning method based on a double-difference method is high in operation speed and efficiency, and is easy for local convergence. As the microseism focus positioning method based on a double-difference method has the relative main event, the relative positioning accuracy is higher and the microseism focus positioning method is not limited by the spacial scale. The microseism focus positioning method based on a double-difference method offsets the error caused by changes of the speed of the near surface and the stratum speed, and can improve the positioning accuracy.

Description

technical field [0001] The invention belongs to the field of petroleum geophysical exploration, and in particular relates to a microseismic source positioning method based on a double-difference method. Background technique [0002] In hydraulic fracturing and reservoir monitoring engineering, microseismic source location is a very important research topic. Through the real-time monitoring of the development of underground rock formation fractures during hydraulic fracturing, a theoretical basis can be quickly provided for the adjustment of reservoir construction after fracturing. Since the seismic signals produced by hydraulic fracturing are very weak, the microseismic monitoring method has become a fast and effective method for reservoir attribute description. Microseismic signals have similar focal mechanisms and signal characteristics to natural seismic signals. Therefore, we can learn from the method of source location in natural seismology to study the source locatio...

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Application Information

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IPC IPC(8): G01S5/22
Inventor 王瑜崔树果郭全仕丁娟毕进娜张瑶张代兰
Owner CHINA PETROLEUM & CHEM CORP
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