Abstract: In order to monitor the subsoil of the earth under a target zone, seismic waves coming from an identified mobile noise source are recorded by means of at least one pair of sensors disposed on either side of the target zone, time periods are selected corresponding to the alignments of the pairs of sensors with the noise source, a seismogram of the target zone is reconstructed by interferometry based on the recorded seismic waves and on the selected time periods and an image of the subsoil of the target zone is generated using the seismogram.

Abstract: In order to monitor the subsoil of the earth under a target zone, seismic waves coming from an identified mobile noise source are recorded by means of at least one pair of sensors disposed on either side of the target zone, time periods are selected corresponding to the alignments of the pairs of sensors with the noise source, a seismogram of the target zone is reconstructed by interferometry based on the recorded seismic waves and on the selected time periods and an image of the subsoil of the target zone is generated using the seismogram.

Abstract: Methods and data acquisition systems enable joint acquisition of seismic and electromagnetic data in a target area using stand-alone digital recorders.

Abstract: Methods and data acquisition systems enable joint acquisition of seismic and electromagnetic data in a target area using stand-alone digital recorders.

Abstract: An electromagnetic measurement system and related methods are provided. The system includes an electromagnetic source located at a predetermined depth and configured to generate electromagnetic waves in surrounding formations, and a grid of electromagnetic detectors located on a surface of the rock formation and configured to detect the electromagnetic waves generated by the electromagnetic source and reflected by an underground hydrocarbons reservoir. The system also includes a data processing unit configured to process first data and second data related to the electromagnetic waves detected by the grid of electromagnetic detectors, to extract changes of the underground hydrocarbon reservoir, the first data and the second data each being acquired for up to one week, at least two months apart from one another. The electromagnetic source and the grid of electromagnetic detectors are not moved or removed between when the first data was acquired and when the second data was acquired.