METHOD FOR DERIVING RESERVOIR LITHOLOGY AND FLUID CONTENT FROM PRE-STACK INVERSION SEISMIC DATA

摘要

A METHOD FOR DERIVING RESERVOIR LITHOLOGY AND FLUID CONTENT FOR A TARGET LOCATION FROM PRE-STACK SEISMIC REFLECTION DATA. THE METHOD USES INVERSION OF PRE-STACK SEISMIC REFLECTION DATA (112) FOR BOTH THE TARGET LOCATION AND A CALIBRATION LOCATION (110) HAVING KNOWN SUBSURFACE LITHOLOGY AND FLUID CONTENT TO DERIVE THE SUBSURFACE LITHOLOGY AND FLUID CONTENT AT THE LOCATION. THE INVERSION PROCESS IN PREFERABLY A VISCOELASTIC INVERSION TO ACCOUNT FOR THE EFFECTS OF FRICTION ON SEISMIC WAVE PROPAGATION. THE RESULTS OF THE INVERSION PROCESS ARE A SET OF SUBSURFACE ELASTIC PARAMETERS FOR BOTH THE TARGET AND CALIBRATION LOCATIONS ( 110) .RELATIVE MAGNITUDES OF THESE SUBSURFACE ELASTIC PARAMETERS ARE COMPARED, TOGETHER WITH THE KNOWN SUBSURFACE ELASTIC PARAMETERS ARE COMPARED, TOGETHER WITH THE KNOWN SUBSURFACE LITHOLOGY AND FLUID CONTENT AT THE CALIBRATION LOCATION, TO DERIVE THE SUBSURFACE LITHOLOGY AND FLUID CONTENT AT THE TARGET LOCATION.(FIGURE 1)