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

Claim 4:
5. 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 amplitude gradient image is obtained by:
based on the enhanced seismic data, select a direction of a seismic sample point to search for a scrambling value of an amplitude vector, and construct a gradient structure tensor field T(s, v) expression as follows:, T
   ⁡
   (
   
    s
    ,
    v
   
   )
  
  =
  
   [
   
    
     
      
       ∫
       
        
         D
         x
         2
        
        ⁢
        
         
          SW
          N
         
         (
         
          s
          ,
          v
         
         )
        
       
      
     
     
      
       ∫
       
        
         D
         x
        
        ⁢
        
         D
         y
        
        ⁢
        
         
          SW
          N
         
         (
         
          s
          ,
          v
         
         )
        
       
      
     
     
      
       ∫
       
        
         D
         x
        
        ⁢
        
         D
         z
        
        ⁢
        
         
          SW
          N
         
         (
         
          s
          ,
          v
         
         )
        
       
      
     
    
    
     
      
       ∫
       
        
         D
         x
        
        ⁢
        
         D
         y
        
        ⁢
        
         SW
         N
        
        ⁢
        
         (
         
          s
          ,
          v
         
         )
        
       
      
     
     
      
       ∫
       
        
         D
         y
         2
        
        ⁢
        
         SW
         N
        
        ⁢
        
         (
         
          s
          ,
          v
         
         )
        
       
      
     
     
      
       ∫
       
        
         D
         y
        
        ⁢
        
         D
         z
        
        ⁢
        
         SW
         N
        
        ⁢
        
         (
         
          s
          ,
          v
         
         )
        
       
      
     
    
    
     
      
       ∫
       
        
         D
         x
        
        ⁢
        
         D
         z
        
        ⁢
        
         SW
         N
        
        ⁢
        
         (
         
          s
          ,
          v
         
         )
        
       
      
     
     
      
       ∫
       
        
         D
         y
        
        ⁢
        
         D
         z
        
        ⁢
        
         SW
         N
        
        ⁢
        
         (
         
          s
          ,
          v
         
         )
        
       
      
     
     
      
       ∫
       
        
         D
         z
         2
        
        ⁢
        
         SW
         N
        
        ⁢
        
         (
         
          s
          ,
          v
         
         )
        
       
      
     
    
   
   ]
  
 

wherein, Dx, Dy and Dz respectively represent a change rate of seismic amplitude along x, y, z with time t, SWN(s, v) represents a smoothing factor along azimuth v; a smoothing function is a multipoint Gaussian function;
after establishing a matrix in a s-direction, calculate an amplitude vector scrambling value as:, f
   ⁡
   (
   
    s
    ,
    v
   
   )
  
  =
  
   
    3
    2
   
   ⁢
   
    
     
      
       λ
       2
      
      (
      
       s
       ,
       v
      
      )
     
     +
     
      
       λ
       3
      
      (
      
       s
       ,
       v
      
      )
     
    
    
     
      
       λ
       1
      
      (
      
       s
       ,
       v
      
      )
     
     +
     
      
       λ
       2
      
      (
      
       s
       ,
       v
      
      )
     
     +
     
      
       λ
       3
      
      (
      
       s
       ,
       v
      
      )
     
    
   
  
 

wherein, λ1, λ2 and λ3 are respectively eigenvalues of a first structure tensor field, a second structure tensor field, and a third structure tensor field of the gradient structure tensor field (T(s, v);
the scrambling value of the amplitude vector form an amplitude gradient image.