METHOD AND APPARATUS FOR INVESTIGATING AN AREA WITH RESPECT TO PRESENCE/ABSENCE OF PREDETERMINED GEOPHYSICAL SUBTERRANEAN PROPERTIES

摘要

For investigating an area with respect to the presence or absence of a predetermined geophysical subterranean property, as especially with respect to the presence/absence of exploitable subterranean hydrocarbon deposits, signa ls emanating from subterranean underground are monitored without applying an investigation stimulus. Under a further aspect there is proposed, irrespecti ve how signals emanating from subterranean underground and as monitored are generated, to perform on such signals a non-linear time series analysis so as to decide whether said predetermined geophysical subterranean property is present or not.