Patent ID: 11860326
Assignee: INSTITUTE OF GEOLOGY AND GEOPHYSICS, CHINESE ACADEMY OF SCIENCES
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 5:
6. The fault characterization method for precise navigation of deep oil and gas based on image fusion as described in claim 1 is characterized in that the dip attribute image is obtained by:
based on the enhanced seismic data, calculate an instantaneous wave velocity Kx(x, y) in a horizontal direction and the instantaneous wave velocity Ky(x, y) in a depth direction respectively:, K
       x
      
      (
      
       x
       ,
       y
      
      )
     
     =
     
      
       
        u
        ⁡
        (
        
         
          d
          H
         
         ⁢
         u
         /
         dx
        
        )
       
       -
       
        
         u
         H
        
        (
        
         du
         /
         dx
        
        )
       
      
      
       
        
         (
         u
         )
        
        2
       
       +
       
        
         (
         
          u
          H
         
         )
        
        2
       
      
     
    
   
   
     
   
  
 

 
  
   
    K
    y
   
   (
   
    x
    ,
    y
   
   )
  
  =
  
   
    
     u
     ⁡
     (
     
      
       d
       H
      
      ⁢
      u
      /
      dy
     
     )
    
    -
    
     
      u
      H
     
     (
     
      du
      /
      dy
     
     )
    
   
   
    
     
      (
      u
      )
     
     2
    
    +
    
     
      (
      
       u
       H
      
      )
     
     2
    
   
  
 

wherein, u is an input data, a superscript H is a Hilbert operator, and d is a total differential;
calculate an instantaneous dip angle θ based on the instantaneous wave velocity Kx(x, y) in the horizontal direction and the instantaneous wave velocity Ky(x, y) in the depth direction:

θ=tan−1(kx/ky)

the instantaneous dip angle constitutes a dip angle attribute image.