Using the horizontal components of microseismic field for detection of extended low velocity inclusions

A. A. Tsukanov, A. V. Gorbatikov

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

A variety of approaches in the passive seismic are currently being developed rather actively. The most widely used approaches are: spatial autocorrelation (SPAC), FK analysis, the horizontal to the vertical ratio, the surface-wave tomography etc. In turn the microseismic sounding method is based on the analysis of the spatial distribution of the amplitudes of microseismic field at different frequencies. Our study revealed that the extended inclusions of the Earth's crust distort the initial random microseismic field in its neighborhood, bringing anisotropy in its statistical parameters. Basing on computer modeling, it was shown that the presence of the extended low velocity heterogeneity affect the spectral ratio of the horizontal component Hy / Hx random surface wavefield. For example, if the heterogeneity model is a fracture plane in the slightly dispersing medium, the horizontal component perpendicular to the plane of the fracture is increased as compared with the horizontal component, which is parallel to this plane. The frequency range where anomaly is observed, is associated with the depth of the anomaly, and we can estimate the position of its horizontal boundaries using an approximate ratio of h ≈ 2/3 L, where L = L (f) -the wavelength of the fundamental mode of Rayleigh waves, corresponding to frequency f. Thus we obtain the perspectives of using the spectral ratio of horizontal components in the microseismic noise for mapping the extended horizontally buried low-velocity areas such as, for example, the zones of faults, as well as the organization of monitoring systems for them.

Original languageEnglish
Title of host publicationGeomodel 2016 - 18th Science and Applied Research Conference on Oil and Gas Geological Exploration and Development
PublisherEuropean Association of Geoscientists and Engineers, EAGE
ISBN (Electronic)9789462821989
Publication statusPublished - 2016
Externally publishedYes
Event18th Science and Applied Research Conference on Oil and Gas Geological Exploration and Development, Geomodel 2016 - Gelendzhik, Russian Federation
Duration: 12 Sep 201615 Sep 2016

Publication series

NameGeomodel 2016 - 18th Science and Applied Research Conference on Oil and Gas Geological Exploration and Development

Conference

Conference18th Science and Applied Research Conference on Oil and Gas Geological Exploration and Development, Geomodel 2016
Country/TerritoryRussian Federation
CityGelendzhik
Period12/09/1615/09/16

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