The patent's assignee is
News editors obtained the following quote from the background information supplied by the inventors: "Survey data can be collected and processed to produce a representation (e.g., image) of a subsurface structure. In some implementations, survey data includes seismic survey data collected using seismic survey equipment. The seismic survey equipment includes one or more seismic sources that are activated to produce seismic wavefields propagated into the subsurface structure. A part of the seismic wavefields is reflected from the subsurface structure and detected by seismic receivers that are part of the survey equipment.
"Seismic surveying can be performed in a marine environment. An issue associated with marine seismic surveying is the presence of ghost data. Ghost data refer to data in measurement data resulting from reflections from an air-water interface of the marine environment. A seismic wavefield generated by a seismic source is propagated generally downwardly into the subsurface structure. A reflected seismic wavefield (that is in response to the seismic wavefield propagated by the seismic source) propagates generally upwardly toward an arrangement of seismic receivers. In the marine environment, where receivers are generally positioned beneath the water surface, the seismic wavefield reflected from the subsurface structure continues to propagate upward past the receivers towards the air-water interface, where the seismic wavefield is reflected back downwardly.
"This reflected, generally downwardly traveling seismic wavefield from the air-water interface is detected by the seismic receivers as ghost data, which appears in measurement data collected by the seismic receivers. The presence of ghost data can result in reduced accuracy when generating a representation of the subsurface structure based on the measurement data."
As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventor's summary information for this patent application: "In general, according to some implementations, survey data corresponding to a subsurface region of interest is received. A wavefield is determined by iteratively performing until a specified condition is satisfied: selecting, for a current iteration based at least in part on a current residual representing an approximation error, an element that includes a representation of at least one portion of the wavefield, where the element is determined from the received survey data; computing, for the current iteration, a respective data structure from the selected element; and orthogonally projecting the data structure onto a space spanned by a plurality of data structures including the computed data structure. The current residual is updated based at least in part on the orthogonal projection.
"Other or alternative features will become apparent from the following description, from the drawings and from the claims.
BRIEF DESCRIPTION OF THE DRAWINGS
"Some embodiments are described with respect to the following figures.
"FIGS. 1 and 2 are schematic diagrams of an example marine survey arrangements for collecting survey data regarding a subsurface structure.
"FIG. 3 is a flow diagram of a wavefield estimation process according to some implementations.
"FIG. 4 is a block diagram of an example control system that includes a wavefield estimation module according to some implementations."
For additional information on this patent application, see: KITCHENSIDE,
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