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Microseismic source location inversion method and system based on grid search
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A technology of source location and grid point search, applied in seismology, seismic signal processing, geophysical measurement, etc., can solve problems such as real-time processing of microseismic monitoring, multi-sampling points, and increased calculation amount, so as to avoid low calculation efficiency , improve search accuracy, and improve search efficiency
Active Publication Date: 2021-02-19
CHINA PETROLEUM & CHEM CORP +1
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However, the grid search of the commonly used global optimization method often produces more sampling points, increases the amount of calculation, and seriously restricts the real-time processing of microseismic monitoring. Therefore, it is necessary to provide an improved grid search method
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Embodiment 1
[0038] In this embodiment, the microseismic source location inversion method based on grid search according to the present invention may include:
[0039] 1) Given the initial position, the area where the initial position is located is discretized using the △h step size, and the initial position is taken as the center, and the area is used as the search area to re-locate and obtain a new positioning position;
[0040] 2) Judging whether the new positioning position is coincident with the initial position, if coincident, proceed to step 4); if not coincident, proceed to step 3);
[0041] 3) Re-locate with the new positioning position as the center until the positioning positions obtained by the previous and subsequent positioning coincide;
[0042] 4) Take the positioning position obtained in the previous step as the center, enlarge the search area and enlarge the step size for discretization, and perform positioning again in the enlarged search area. If the new positioning pos...
Embodiment 2
[0075] According to an embodiment of the present invention, a microseismic source location and inversion system based on grid search is provided. The system includes: a memory storing computer-executable instructions; implements the following steps:
[0076] 1) Given the initial position, the area where the initial position is located is discretized using the △h step size, and the initial position is taken as the center, and the area is used as the search area to re-locate and obtain a new positioning position;
[0077] 2) Judging whether the new positioning position is coincident with the initial position, if coincident, proceed to step 4); if not coincident, proceed to step 3);
[0078] 3) Re-locate with the new positioning position as the center until the positioning positions obtained by the previous and subsequent positioning coincide;
[0079] 4) Take the positioning position obtained in the previous step as the center, enlarge the search area and enlarge the step size ...
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Abstract
The present invention discloses a microseismic source location inversion method and system based on grid point search, including: 1) after discretizing the area where the initial position is located with the Δh step length, taking the initial position as the center, and using the area as a search area Re-positioning and obtaining a new positioning position; 2) Judging whether the new positioning position coincides with the initial position; 3) Re-positioning with the new positioning position as the center until the positioning positions obtained by the previous and subsequent positioning coincide; 4) Before The positioning position obtained in the first step is the center, and repositioning is performed in the enlarged search area. If the new positioning position does not coincide with the positioning position output in the previous step, repeat the operation of step 3), otherwise output the positioning position; 5) before The positioning position obtained in the first step is taken as the center, and the search area is reduced and the step size is reduced for discretization. If the new positioning position does not coincide with the positioning position obtained in the previous step, repeat the operation of step 3), otherwise output the final positioning position.
Description
technical field [0001] The invention belongs to the technical field of hydraulic fracturing microseismic monitoring data processing, and more specifically relates to a microseismic source location and inversion method and system based on grid point search. Background technique [0002] Microseismic monitoring technology is an important means of fracture extension and distribution monitoring during the development of hydraulic fracturing shale gas and other unconventional reservoirs. The surface monitoring method can have wider observation coverage than the well monitoring method, can improve the accuracy of data processing, and provide important parameters for well pattern deployment and fracturing plan optimization. [0003] Due to the poor quality of ground monitoring signal data, it is difficult to pick up accurate first-arrival times. Therefore, the seismic record stacking function is generally used as the inversion objective function to locate microseismic events. The ...
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