ARRANGEMENT AND PROCESS FOR LOCATING AND/OR CHARACTERISING FRACTURE EVENTS IN THE EARTH CRUST, PARTICULARLY SUITABLE TO MONITOR FRACKING

摘要

The invention relates to an arrangement comprising a) a waveguide, being at least partially positioned in a borehole, wherein the borehole I) comprises an entrance in an Earth surface, and II) extends into an Earth crust; b) an injection site, positioned below the Earth surface by a vertical distance of at least 100 m in the borehole; c) a first sensor arrangement, designed and arranged to measure a mechanical wave, which is at least partially guided by the wave guide prior to being measured; and d) a second sensor arrangement; wherein the wave guide extends at least partially between the injection site and the entrance, wherein the first sensor arrangement and the second sensor arrangement are time-synchronised and horizontally distanced from each other by a horizontal distance, wherein the horizontal distance is at least 10 % of the vertical distance.The invention further relates to a process for determining a location of a fracture event, or a size of a fracture,or both; to a process for producing a fossil-fuel-based product; to a fossil-fuel-based product obtainable by the preceding process; to a process comprising storing a fluid in the Earth crust; to a process comprising injecting a fluid at a first temperature into the Erath crust and extracting the fluid at a further temperature; to a product obtainable by any of the two preceding processes; and to a use of the arrangement according to the invention for monitoring an operation.