System for processing well log data

A method of processing well log data comprising:

• locating in a reflection coefficient series calculated from well log data consisting of one of the following types:
• compressional wave velocity log data, shear wave velocity data, density log data, acoustic impedance log data or elastic impedance log data, pairs of reflection coefficients of opposite polarity and spaced apart within the thickness range of a thin bed;
• for each said pair of reflection coefficients, determining the magnitude of the reflection coefficient having the smaller magnitude and subtracting said smaller magnitude from the magnitude of each reflection coefficient of said pair, thereby developing a first modified reflection coefficient series;
• for each said pair of reflection coefficients, multiplying said smaller magnitude by a factor which is related to the time spacing in said log data between said pair of reflection coefficients;
• and storing the resulting multiplied magnitude in a data storage array at a location corresponding to the locations of said pair of reflection coefficients, thereby developing a second modified reflection coefficient series;
• summing said first modified reflection coefficient series and said second modified reflection coefficient series;
• and
• inverting said summed first and second coefficient series to generate modified well log data of the type from which said reflection coefficient series was calculated.

A method of processing well log data comprising:

• generating an initial reflection coefficient series from well log data consisting of one of the following types:
• compressional wave velocity data, shear wave velocity data, density log data, acoustic impedance log data or elastic impedance log data;
• determining in said initial reflection coefficient series pairs of reflection coefficients of opposite polarity and spaced apart within the thickness range of a thin bed;
• attenuating both reflection coefficients of each said pair by a factor related to the spacing between said pair thereby generating a modified reflection coefficient series;
• and
• inverting said modified reflection coefficient series to generate a modified well log data of the type from which said initial reflection coefficient series was calculated.

A method of processing well log data comprising

• generating an initial reflection coefficient series from well log data consisting of one of the following types:
• compressional wave velocity data, shear wave velocity data, density log data, acoustic impedance log data or elastic impedance log data;
• determining in said initial reflection coefficient series pairs of reflection coefficients of opposite polarity and spaced apart within the thickness range of a thin bed;
• for each said pair of reflection coefficients, determining the magnitude of the reflection coefficient having the smaller magnitude and subtracting said smaller magnitude from the magnitude of each reflection coefficient of said pair, thereby developing a first modified reflection coefficient series;
• for each said pair of reflection coefficients, multiplying said smaller magnitude by a factor which is related to the time spacing in said log data between said pair of reflection coefficients;
• and storing the resulting multiplied magnitude in a data storage array at a location corresponding to the locations of said pair of reflection coefficients, thereby developing a second modified reflection coefficient series;
• inverting said first modified reflection coefficient series to generate first modified well log data of the type from which said reflection coefficient series was calculated;
• summing said first modified reflection coefficient series and said second modified reflection coefficient series;
• and
• inventing said summed first and second coefficient series to generate second modified well log data of the type from which said reflection coefficient series was calculated.

A device adapted for use by a digital computer wherein a plurality of computer instructions readable by said digital computer are encoded, which instructions instruct the computer to perform a process comprising:

• generating an initial reflection coefficient series from well log data consisting of one of the following types:
• compressional wave velocity data, shear wave velocity data, density log data, acoustic impedance log data or elastic impedance log data;
• determining in said initial reflection coefficient series pairs of reflection coefficients of opposite polarity and spaced apart within the thickness range of a thin bed;
• for each said pair of reflection coefficients, determining the magnitude of the reflection coefficient having the smaller magnitude and subtracting said smaller magnitude from the magnitude of each reflection coefficient of said pair, thereby developing a first modified reflection coefficient series;
• for each said pair of reflection coefficients, multiplying said smaller magnitude by a factor which is related to the time spacing in said log data between said pair of reflection coefficients;
• and storing the resulting multiplied magnitude in a data storage array at a location corresponding to the locations of said pair of reflection coefficients, thereby developing a second modified reflection coefficient series;
• inverting said first modified reflection coefficient series to generate first modified well log data of the type from which said reflection coefficient series was calculated;
• summing said first modified reflection coefficient series and said second modified reflection coefficient series;
• and
• inverting said summed first and second coefficient series to generate second modified well log data of the type from which said reflection coefficient series was calculated.