A process for improved identification of seismic events in the lower characteristic volume during less peaked

摘要

- method to facilitate the detection and identification of seismic events or micro - seismic, by means of permanent sensors in an underground zone during operation. - the method comprises the installation remains, in one or several wells, of elastic waves geophones, hydrophones, so as to leave the wells free for the operation of the zone, and also at least one reference sensor with acoustic coupling with the technical equipment of the operation of the zone (sensor is pressed against a production string for example) for the detection of events related directly to the operation of the well (opening and closing of valves, etc.), the acquisition of signals coming from the various receivers and each reference pickup, in response to the received waves, as well as the comparative analysis of the signals associated with the receivers and the (x) sensor (s) of reference, in order to sort the recordings of different families according to whether the events in the underground zone are independent of the events detected by each reference pickup or depend directly or indirectly, and for each family, the use of specific treatments. - application, for example, to the monitoring of long-term deposits of production or for storing fluids: hydrocarbons, various waste, geothermics, etc, 1 / p