Low frequency passive seismic data acquisition and processing

摘要

Low sensitivity, single vertical axis or uniaxial transducer sensors are deployed along receiver lines across an area of interest to acquire low frequency passive seismic data from the earth. Recordings formed of the acquired low frequency passive seismic data are decomposed in the frequency-wavenumber (F-K) domain according to wavefront dipping angles into mono-dominant velocity seismic records. Resulting seismic waves of different types are identifiable based on the different dipping angles. Wavefields can then be analyzed separately in either time or frequency domains and analyzed or integrated with other data.

主权项

1. A method of acquiring low frequency seismic data about the travel of naturally occurring seismic waves through the earth in a region of interest, comprising the steps of:
deploying uniaxial sensors along a receiver line at the surface of the earth in the region of interest; sensing with the deployed uniaxial sensors movements of the earth in response to the travel of naturally occurring seismic waves; forming a record of sensed earth movements as a function of time to form passive seismic data; bandpass filtering the passive seismic data to remove frequency components above a low frequency limit; decomposing the bandpass filtered passive seismic data in the FK (frequency-wavenumber) domain into coherent mono-dominant velocity and dip-angle components; and processing the decomposed bandpass filtered passive seismic data.