Method and device for obtaining source point of microseismic
A technology of micro-seismic and focal points, applied in the direction of seismic signal processing, etc., can solve the problems of inaccurate first arrival, inaccurate micro-seismic focal points, and inaccurate focal points, etc., and achieve the effect of improving accuracy
Active Publication Date: 2017-04-26
BC P INC CHINA NAT PETROLEUM CORP +1
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However, the method of obtaining the source point of microseismic events based on ray theory requires manual picking of first arrivals. In complex media regions, when the signal-to-noise ratio of microseismic seismic records is low or there are multiple simultaneous microseismic events , which often leads to inaccurate first arrivals picked manually, which leads to inaccurate source points of microseismic earthquakes obtained based on ray theory
[0004] Therefore, there is a need for a method to obtain the source point of the microseismic to overcome the problem of inaccurate source point acquisition caused by manual picking of first arrivals
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[0023] Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like numerals refer to like parts throughout.
[0024] figure 1 A flowchart showing a method for acquiring hypocenter points of microseismic events according to an exemplary embodiment of the present invention.
[0025] In step S10, the collected microseismic seismic data are acquired.
[0026] As an example, the acquired seismic data may be the seismic data acquired in a single acquisition, or the seismic data acquired in multiple acquisitions.
[0027] In step S20, velocity field information is extracted according to the acquired seismic data.
[0028] Specifically, the velocity field information of the acquisition area may be extracted according to the acquisition area of the acquired seismic data. For example, velocity field information in different areas may be stored in advance, and when seismic data is acquired...
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The invention provides a method and device for obtaining a focus point of a microseism. The method includes the steps of (a) obtaining collected seismic data of the microseism; (b) extracting velocity field information according to the obtained seismic data; (c) obtaining a reversed transmitting longitudinal wave field and a reversed transmitting transverse wave field according to the obtained seismic data and the extracted velocity field information; (d) obtaining the focus point of the microseism according to the obtained reversed transmitting longitudinal wave field and the obtained reversed transmitting transverse wave field.
Description
technical field [0001] The invention relates to the field of seismic data processing, and more specifically, to a method and device for acquiring microseismic source points. Background technique [0002] Microseismic monitoring plays a pivotal role in oil and gas exploration and development. The acquisition of microseismic source points is the basic problem of microseismic monitoring, and it is the basis for further inversion of fracturing parameters and further study of rock fracturing mechanism by using microseismic data. As the oil and gas exploration area is gradually developing into a complex medium area, there is a higher requirement for the accuracy of the acquired microseismic source points. [0003] Usually, the method of obtaining the source point of microseismic is to obtain the source point of microseismic based on ray theory. However, the method of obtaining the source point of microseismic events based on ray theory requires manual picking of first arrivals. ...
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IPC IPC(8): G01V1/30
Inventor 胡善政李亚林何光明陈爱萍敬龙江陈燕雄王晓阳蔡力
Owner BC P INC CHINA NAT PETROLEUM CORP