Patent ID: 9250344
Filing Date: 2016-02-02
CPC Classification: G01V

Claim Text:
1. A method to acquire seismic data to estimate reservoir characteristics in a shallow sea water environment, the method comprises: placing a seismic source in a body of ocean water; using the seismic source to generate a plurality of pressure wave shots in the water while varying a time delay and spacing between the plurality of shots; using a hydrophone and a three component geophone to detect the plurality of shots and thereby acquire four component ocean bottom cable (4C OBC) seismic data; applying a full acoustic modelling process and an elastic modelling process to the acquired 4C OBC seismic data to analyze the acquired 4C OBC seismic data to acquire a pressure data and an inline geophone data; estimating a horizontal component data and a reflected shear wave data from the acquired 4C OBC seismic data; performing a NMO-correction process on the estimated horizontal component data; and stacking the acquired horizontal component data obtained by varying sampling intervals to remove noise component in acquired seismic data; wherein the full acoustic modelling process is applied by setting a shear wave velocity to zero for all layers to perform 2D and 3D full waveform finite-difference modelling (FDM) to acquire both the pressure data and the inline geophone data, and further wherein the elastic modelling process is applied by using a 2D finite-difference grid with a size of 2.5 m ×2.5 m and a temporal sampling interval of 0.25 ms to avoid spatial aliasing and to ensure numerical stability.