A Method for Amplitude Equalization of Microseismic Monitoring Data
A technology of amplitude equalization and monitoring data, which is applied in the field of amplitude equalization of microseismic monitoring data, which can solve the problems that the positioning accuracy cannot be guaranteed, the first arrival time of events is difficult to be judged, and affects the positioning results of microseismic monitoring, so as to improve the positioning accuracy Effect
Active Publication Date: 2020-02-07
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
However, the local energy extremum in current microseismic positioning methods will seriously affect the positioning results of microseismic monitoring
[0003] The positioning method based on event information has higher requirements for event identification and first-arrival picking. If there is a trace with extremely weak energy in the event of microseismic monitoring data, it will be difficult to judge the first-arrival time of the event on this trace. , so that the positioning accuracy cannot be guaranteed
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[0012] Hereinafter, the microseismic monitoring data amplitude equalization method according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.
[0013] Specifically, in the actual location of microseismic events, due to the distance, geological structure, geophones, etc., the average size of the signals received by each arrangement of the geophone array will be different, which will cause later microseismic events. Positioning deviation. The essence of the present invention is to enhance the channels with relatively weak energy and weaken the channels with relatively strong energy, so that the energy between each channel can be balanced, so as to improve the positioning accuracy of microseismic events.
[0014] figure 1 A schematic flowchart of a method for equalizing microseismic monitoring data amplitude according to an exemplary embodiment of the present invention is shown. figure 2 A comparison diagram ...
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The invention provides a microseismic monitoring data amplitude equalization method, and the method comprises the following steps: obtaining the number of microseismic events in seismic trace data; selecting a calculation time window, and solving the maximum value of the maximum amplitude absolute value of each concentrical trace of to-be-processed microseismic events in the calculation time window; solving the maximum amplitude mean value of all concentrical traces; solving the product of the amplitude of each sampling point of each concentrical trace and the square root of the ratio of the maximum amplitude mean value to the maximum amplitude absolute value of each concentrical trace, and obtaining the amplitude after equalization; repeatedly carrying out the step of selecting the calculation time window to the step of obtaining the amplitude after equalization, and carrying out the looped execution to the next to-be-processed microseismic event till all to-be-processed microseismicevents are processed. The method can eliminate the impact on the precise positioning from the different of energy sizes between the concentrical traces, and facilitates the improvement of the positioning precision of the microseismic events.
Description
Technical field [0001] The invention relates to a microseismic monitoring technology for unconventional oil and gas development, and more specifically, to a method of microseismic monitoring data amplitude equalization, which mainly uses surface or shallow well monitoring records to extract relevant information for amplitude equalization. Background technique [0002] Microseismic monitoring and positioning mainly have two positioning methods based on energy superposition and event information. The positioning method based on energy superposition is to add the energy of the microseismic waveforms of each recording channel, and the space coordinate corresponding to the maximum energy is defined as the spatial focal position of the microseismic event. In the positioning method based on energy superposition, there must be a certain gather and well position energy coefficient in order to obtain comprehensive and reliable microseismic positioning energy information. However, the loca...
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IPC IPC(8): G01V1/24
CPCG01V1/245
Inventor 刘丽婷尹陈李亚林巫芙蓉康亮曹立斌唐建张维戈理朱霁玮
Owner BC P INC CHINA NAT PETROLEUM CORP