Method for determining longitudinal wave speed and transverse wave speed of coalbed gas
A technology of shear wave velocity and longitudinal wave velocity, applied in the field of exploration data processing, can solve problems such as difficulty in determining the velocity of longitudinal wave and shear wave, failure of parameter regression, and complex relationship
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[0039] 1) Collect seismic exploration and logging data, and obtain L group shear wave velocity y and shear wave velocity x after processing (the same below);
[0040] 2) According to the formula (1), the average value of y and x is zero;
[0041] 3) Normalize y and x according to formula (2);
[0042] 4) Calculate the initial value φ of the optimal transformation of x and y according to formula (3) respectively 0 (x) and θ 0 (y):
[0043] 5) Find the best transformation φ of x and y for the kth iteration according to formula (4) k (x) and θ k (y);
[0044] 6) Calculate the error of two adjacent iterations according to formula (5),
[0045] 7) Repeat steps 5) and 6) until the error of two adjacent iterations satisfies formula (6), then the best transformation function θ(y) of shear wave velocity y and the best transformation function φ(y) of longitudinal wave velocity x are obtained. x)
[0046] 8) Use the linear regression method to regress the function values of the...
specific example
[0049] 1) Obtain pre-stack seismic records and logging records, and obtain shear wave velocity y and shear wave velocity x after processing;
[0050] figure 1 It is a scatter diagram of the shear wave velocity and the longitudinal wave velocity of the experimental well of the present invention, and the present invention is the most experimental example. The straight line in the figure represents the linear fitting relationship, and it can be seen that the correlation coefficient is 0.889.
[0051] 2) According to step (2) - step (3), preprocess y and x to obtain the shear wave and longitudinal wave velocity after the average value is zero and normalized;
[0052] 3) Obtain the optimal transformation of y and x according to step (4)-step (7);
[0053] figure 2 is the scatter diagram of the best transformation of the shear wave velocity and the shear wave velocity of the experimental well of the present invention, image 3 It is the scatter diagram of the optimum transformati...
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