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Crust thermobaric anomalies of rocks lowered density and enhanceable porosity
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 14th EAGE International Conference on Geoinformatics - Theoretical and Applied Aspects, May 2015, Volume 2015, p.1 - 5
Abstract
Physical characteristics of different types of crystalline (igneous and metamorphic) rocks largely depend on their fractures and porosity, state of intergrain boundaries. Interest to researches of interstitial space considerably grew in connection with the study of migration of gas-liquid fractions, in particular hydrocarbons, in crystalline rocks on the different depths of lithosphere. All of gamut of appropriate and casual reasons, which influence on formation of pores and microfractures, to expose it is practically impossible. However, a tendency is exposed, that at petrographically similar groups of rocks the increase of porosity and microfractures conduces to reduce of elastic waves propagation velocity in them. In the offered work on the basis of study of connection of interstitial space with the longitudinal waves propagation velocity at high pressures and temperatures in the Ukrainian shield granites samples an attempt more fully to describe a change porosity and fractures of rocks depending on Р and Т influence of different depths is carried out, to explain some crust anomalies of rocks unpacking, which can be conductors of migration and localization of deep origin hydrocarbons.