Methods and apparatus for generating deghosted seismic data

摘要

One embodiment relates to a method for deghosting seismic data from a marine seismic survey. The seismic data from the marine seismic survey is obtained, where the marine seismic survey was performed using multiple sub-sources towed at two or more different depths and fired at distinct time-delays. The seismic data is sorted into common receiver gathers, and the common receiver gathers are transformed from horizontal source coordinates to horizontal wavenumbers. For each selected frequency, a matrix operator is constructed, and an inversion procedure is applied to a system of equations based on the matrix operator to generate source-deghosted seismic data. Other embodiments, aspects and features are also disclosed.

主权项

1. A method for deghosting seismic data from a marine seismic survey, the method comprising:
obtaining the seismic data from the marine seismic survey, wherein a source for the marine seismic survey comprises multiple sub-sources towed at two or more different depths and fired at distinct fire-time delays; sorting the seismic data into common receiver gathers; transforming the common receiver gathers from a space-time domain that includes horizontal source coordinates to a frequency-wavenumber domain that includes horizontal wavenumbers; constructing a matrix operator for a selected frequency; applying an inversion procedure to a system of equations based on the matrix operator to generate source-deghosted seismic data at the selected frequency; changing the selected frequency and repeating said constructing and said applying for a range of frequencies; transforming the source-deghosted seismic data from the frequency-wavenumber domain to the space-time domain; and using the source-deghosted seismic data for determining structures of a subsurface rock formation.