Micro-earthquake positioning method and device

Abstract

The embodiment of the invention provides a micro-earthquake positioning method and device. The method comprises the steps of constructing an initial velocity model representing formation velocity, utilizing the initial velocity model for positioning, and obtaining the initial position of a micro-earthquake event; according to the three-dimensional distribution of the initial position of the micro-earthquake event, calculating the enveloping surface of the micro-earthquake event, wherein space inside the enveloping surface is a fracture belt; obtaining the velocity equivalent of the fracture belt, wherein the velocity equivalent of the fracture belt can represent real-time changes of the formation velocity in the fracture process; according to the velocity equivalent of the fracture belt, and the spatial distribution of the fracture belt, updating the initial velocity model, and obtaining the updated velocity model; utilizing the updated velocity model for positioning, and obtaining the position of the micro-earthquake event. According to the micro-earthquake positioning method and device, the updated velocity model takes the factor of the real-time changes of the formation velocity in the fracture process into consideration, and the result of positioning through the updated velocity model is higher in accuracy and reliability.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration, in particular to a microseismic positioning method and device. Background technique [0002] In the process of unconventional oil and gas extraction, due to the low permeability of the formation, conventional oil and gas extraction techniques cannot obtain considerable production, and hydraulic fracturing is often used to enhance recovery. Hydraulic fracturing technology uses the characteristics of fluid pressure transmission to inject high-pressure fluid into the formation to break the rock and extend it to a certain length, improving the permeability of the formation to achieve the purpose of increasing oil and gas production. During hydraulic fracturing, the microseismic signals after positioning can indicate the distribution of fractures and be used to guide the next stage of fracturing operations and formulate corresponding development strategies. Therefore, the accuracy of p...

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Problems solved by technology

[0004] The embodiment of the present invention provides a microseismic positioning method and device, which solves the technical problems of low accuracy and low reliability of inversion results in the hydraulic fracturing process in the prior art

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