Abstract:

Based on elastic impedance（EI） inversion, we focused on the study of joint EI inversion of PP and PS waves using both PP and PS wave seismic data information. First, we analyzed the precision of different equations, choosing appropriate PS wave EI approximate equation, and normalized the selected PS wave EI approximate equation. Then, the study presented method of joint EI inversion of PP and PS waves, proposing the workflow of this method. Finally, for 2D model and a well of a real project, it tested the method by adding random noise to angle gathers. The result showed that the estimated value of  inverted P wave velocity, S wave velocity and density consisted with the real data. Meanwhile, in comparison with single P wave EI inversion, the estimated density of joint EI inversion of PP and PS waves is more robust. It can provide reliable basis for reservoir identification and fluid detection.

Key words: elastic impedance, converted wave, joint inversion, reflection coefficient, angle gathers