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Ground microseismic event locating method based on Fresnel volume tomography inversion

A technology of tomographic inversion and positioning method, which is applied in the field of geophysical exploration, can solve the problems of large positioning errors, achieve the effects of reducing positioning errors, optimizing computing efficiency, and improving positioning accuracy

Active Publication Date: 2017-06-09
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a high-precision ground microseismic event positioning method based on Fresnel volume tomography for the situation where the positioning error of ground microseismic monitoring is too large

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  • Ground microseismic event locating method based on Fresnel volume tomography inversion
  • Ground microseismic event locating method based on Fresnel volume tomography inversion
  • Ground microseismic event locating method based on Fresnel volume tomography inversion

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Embodiment 1

[0051] Example 1. Such as figure 1 As shown, the ground microseismic event location method based on Fresnel volume tomography includes the following steps: (1) microseismic data and information input; (2) first arrival picking and initial source location; (3) defining the initial velocity (4) Ray tracing to calculate propagation path; (5) Fresnel body forward modeling; (6) Calculate travel time residual; (7) Solve tomographic inversion equation to calculate velocity correction; (8) Update velocity model and Source location; (9) Replace the velocity model in step (3) with the velocity model in step (8), repeat steps (3)-(8), and output the final velocity model and source location.

[0052] The current mainstream microseismic event location methods include longitudinal and transverse wave time difference method, homotype wave time difference method, Monte Carlo method and energy scanning superposition method, etc. These methods all use constant equivalent velocity as the veloci...

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Abstract

The invention discloses a ground microseismic event locating method based on Fresnel volume tomography inversion, and the method comprises the steps: inputting microseismic data and information; picking up first arrival and locating an initial seismic focus; defining an initial speed model; calculating a propagation path through ray tracking; carrying out the Fresnel volume forwarding modeling; calculating a travel time residual; solving a tomography inversion equation, and calculating a speed correction value; updating a speed model and carrying out the positioning of the seismic focus; and outputting a final speed model and the position of the seismic focus through repeated iteration. The method gives consideration to condition that a seismic signal recorded by a seismic apparatus is the comprehensive effect of medium abnormality of the surroundings of a mathematic ray. Compared with a method which just gives consideration to the mathematic ray, the method accords with the reality in a better way, and facilitates the improvement of the positioning precision of a microseismic event in the subsequent processing. The method can obtain the high-precision positioning result of the microseismic event under the condition of an accurate macroscopic speed field, and two sides exert restraints on each other in a solving process. Finally, an underground macroscopic speed field and the positioning result are outputted at the same time.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration, in particular to a method for locating ground microseismic events. Background technique [0002] Microseismic monitoring technology is a new geophysical prospecting technology developed in the 20th century. It is a geophysical technology that monitors the impact, effect and underground state of production activities by observing and analyzing small seismic events generated in production activities. It can be used in oil and gas development, coal mine monitoring, mine pressure monitoring, geological disaster monitoring and other fields. At present, many foreign oil companies have conducted a large number of experimental studies on the application of microseismic monitoring technology in the oil and gas field development stage. Although the application of this technology in the oil and gas industry has not become a routine, the technology itself is becoming more and more mature. In...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 王东凯尚新民单联瑜芮拥军李继光崔庆辉刁瑞刘鹏翔胡晓婷张文婷王岩周彦岑
Owner CHINA PETROLEUM & CHEM CORP
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