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UDC (550.837.82+550.837.652.013):553.4
EVALUATION OF RESOLUTION CAPACITY OF TRANSIENT ELECTROMAGNETIC SURVEY IN SEARCHIG FOR SULPHIDE BODIES
M. V. Abramov, A. A. Belaya, G. M. Trigubovich
In electrical survey, one of important tasks is evaluation of resolution capacity of a selected measurement method and field survey design for identification of geoelectrical targets. The paper considers the capacities of transient electromagnetic survey when searching for deep subvertical sulphide targets under high electric resistance of the hosting volcanic rocks. Anomalous fields were discussed for most typical shooting schemes with a permanent source. Anomalous fields are characterised by the form and lower signal level as compared to subhorizontal targets. This complicates the survey of such targets and requires brightening of anomalous fields. The paper considers possibilities to enhance such subvertical target signals by changing electromagnetic field configuration and registration of its different components, together with applying of the mathematical tool of loop-source based simulation of 3D electromagnetic fields.
Key words: 3D pulsed electrical survey, 3D modelling, search for local targets, ungrounded loop source.
DOI 10.20403/2078-0575-2016-3-98-105
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