Device and method for wave-field reconstruction

Abstract

Computing device, computer instructions and method for processing input seismic data d. The method includes a step of receiving the input seismic data d recorded in a first domain by seismic receivers that travel in water, the input seismic data d including up-going and down-going wave-fields; a step of generating a model p in a second domain to describe the input seismic data d; and a step of processing with a processor the model p to obtain an output seismic dataset indicative of the down-going wave-field and substantially free of the up-going wave-field.

What is claimed is: 
     
         1 . A method for processing input seismic data d, the method comprising:
 receiving the input seismic data d recorded, in a first domain, by seismic receivers that travel in water;   generating a model p in a second domain to describe the input seismic data d; and   processing with a processor the model p to generate an output particle motion dataset.   
     
     
         2 . The method of  claim 1 , wherein the input seismic data d includes only pressure measurements. 
     
     
         3 . The method of  claim 1 , wherein the input seismic data d includes only particle motion measurements. 
     
     
         4 . The method of  claim 1 , wherein the input seismic data d includes both pressure and particle motion measurements. 
     
     
         5 . The method of  claim 1 , wherein the output particle motion dataset is not corrected for obliquity. 
     
     
         6 . The method of  claim 1 , wherein the output particle motion dataset is corrected for obliquity. 
     
     
         7 . The method of  claim 6 , wherein the obliquity is defined by an angle between a respective wave-field propagation direction and a receiver orientation. 
     
     
         8 . The method of  claim 7 , wherein the receiver orientation is defined by an angle relative to gravity. 
     
     
         9 . The method of  claim 7 , wherein the receiver orientation is defined by an angle relative to the nominal shooting direction. 
     
     
         10 . The method of  claim 1  where the output particle motion data is re-orientated. 
     
     
         11 . The method of  claim 1 , wherein the processing step comprises:
 wave-field reconstruction of the pressure wave-fields based on the model p.   
     
     
         12 . The method of  claim 1 , wherein pressure wave-fields are reconstructed at the same positions as the input seismic data, d. 
     
     
         13 . The method of  claim 1 , wherein incoming wave-fields are reconstructed at new receiver positions. 
     
     
         14 . The method of  claim 13 , wherein the new positions are at different depths to the input data and the new positions are in-between the streamers. 
     
     
         15 . The method of  claim 1 , wherein the output particle motion dataset includes both an up-going wave-field and a down-going wave-field. 
     
     
         16 . The method of  claim 1 , wherein the output particle motion dataset is substantially free of the down-going wave-field. 
     
     
         17 . The method of  claim 1 , wherein the output particle motion dataset is substantially free of the up-going wave-field. 
     
     
         18 . The method of  claim 1 , wherein the output particle motion dataset is used for generating a final image of a surveyed subsurface. 
     
     
         19 . A computing device for processing input seismic data d, the device comprising:
 an interface configured to receive the input seismic data d recorded, in a first domain, by seismic receivers that travel in water; and   a processor connected to the interface, the processor being configured to,   generate a model p in a second domain to describe the input seismic data d; and   process the model p to generate an output particle motion dataset.   
     
     
         20 . A non-transitory computer readable medium including computer executable instructions, wherein the instructions, when executed by a processor, implement instructions for processing input seismic data d, the instructions comprising:
 receiving the input seismic data d recorded, in a first domain, by seismic receivers that travel in water;   generating a model p in a second domain to describe the input seismic data d; and   processing the model p to generate an output particle motion dataset.