Objective
THE MAIN AIM OF THIS WORK IS TO ASSESS SURFICIAL METHODS FOR DETECTING THE SECONDARY PERMEABILITY IN CLAY AND SHALE IN SEDIMENTARY BASINS BY MEANS OF DIRECT IN SITU OBSERVATIONS AND DETECTION OF SOME NOBLE GASES IN SOIL-GAS AS TRACERS OF FRACTURES, FAULTS ETC.
THE CHOSEN GASES ARE HELIUM 4 AND RADON-222. BOTH THESE GASES ARE USED FROM SEVERAL YEARS FOR LOCATING ORE, OIL AND GEOTHERMAL FLUIDS AS WELL AS EARTHQUAKE PRECURSORS.
IN THIS REPORT ONLY HELIUM WILL BE DISCUSSED. THE HELIUM IN THE ATMOSPHERE IS A MIXTURE OF HELIUM OF DIFFERENT ORIGIN: RADIOGENIC HELIUM MAINLY FROM THE METAMORPHIC BASEMENT, PRIMORDIAL HELIUM FROM THE MANTLE. THE RATE AT WHICH HELIUM ESCAPES FROM THE CRUST IS LOWER THAN THE RATE OF ITS PRODUCTION SO THAT THE CRUST ITSELF MAY REPRESENT AN ACCUMULATION ZONE FOR THIS ELEMENT. HELIUM REACHES THE SURFACE USING FRACTURES AND FAULTS AS PREFERENTIAL ROUTES FOR ESCAPING. THE CHOICE OF THIS ELEMENTS FOR DETECTING FRACTURES RELAY ON:
- IT IS A CHEMICALLY FULLY INERT ELEMENT;
- ITS ATOMIC RADIUS IS VERY SMALL, COMPARABLE WITH THAT ONE OF HYDROGEN.
THESE CHARACTERISTICS MAKE HELIUM ONE OF THE MOST MOBILE ELEMENT AND THEREFORE IT CAN BEHAVE AS AN EXCELLENT TRACER OF GEOLOGICAL DISCONTINUITIES AS WELL AS OF THE PRIMARY PERMEABILITY OF THE ROCKS.
THIS REPORT PRESENTS THE RESULTS OF THE SURVEY DONE AT VASTO AND VAL DI PAGLIA, AS A CONTINUATION OF PRECEEDING RESEARCHES CARRIED OUT IN VAL D'ERA.
1. PRELIMINARY SURVEY OF HELIUM IN SOIL-GAS AT A REGIONAL SCALE IN SEDIMENTARY BASINS CHARACTERIZED BY DISTENSIVE TECTONICS AND, FOR COMPARISON, BY COMPRESSIVE ONES;
2. IN SITU OBSERVATIONS AND INFORMATION FROM OPERATORS ABOUT THE HYDROLOGICAL MEANING OF FRACTURES IN CLAY.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences chemical sciences inorganic chemistry noble gases
- natural sciences earth and related environmental sciences geology seismology
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Programme(s)
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Coordinator
00060 Santa Maria di Galeria (Roma)
Italy
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