VELOCITY MODEL CREATION AND THEORETICAL BASICS OF THE METHODS OF DETERMINING THE HYPOCENTER OF A MICROSEISMIC EVENT WHILE PERFORMING HYDRAULIC FRACTURING
DOI:
https://doi.org/10.17721/1728-2713.101.05Keywords:
hydraulic fracturing, microseismic monitoring, inverse problem solving, velocity modelAbstract
The article is devoted to the analysis of the characteristics of the determining stages of data processing of microseismic monitoring of hydraulic fracturing. The importance of having an accurate velocity model and the stages of its creation are substantiated. A classification of velocity models and the input data required for their creation are provided. Groups of methods for determining the hypocenter of a microseismic event, their advantages, limitations and factors affecting the accuracy of calculations are considered. A detailed description of specific methods is given. Among the absolute methods are grid search methods, linearized inversion (Geiger) and methods based on the extension of wave fields into the medium. Among the relative methods are the master-event method and the double-difference method. Algorithms for the application of specific methods are given. An example of the comparative characteristics of various methods when choosing a method for determining the hypocenter of a microseismic event is provided.
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