Showing papers by "China University of Petroleum published in 1996"

2-D acoustic wave equation inversion combining plane‐wave seismograms with well logs

Abstract: Seismic waves can be described approximately by an acoustic wave equation. An inversion procedure for obtaining velocities using well logs and plane-wave reflection seismograms is described. The forward problem is based on the 2-D acoustic wave equation. The inversion is performed by minimizing the difference between the calculated data and the observed data using the least-squares regularization method. The numerical example shows that the stability and the robustness of the algorithm to noisy data is improved by introducing well logs into the inversion process.

A modified Kurihara mixing rule and a comparison of density-independent mixing rules

Abstract: A modified density-independent Kurihara mixing rule is developed by introducing the low density limit condition into the excess Helmholtz free-energy function at infinite pressure. A parallel comparison of the new mixing rule and existing density-independent mixing rules was performed using the same equation of state and excess function and the same experimental data sets. Five existing density-independent mixing rules were examined: Huron and Vidal (1979), Kurihara et al. (1987), Wong and Sandler (1992) and van der Waals mixing rules with one or two binary interaction coefficients. Non-polar, non-polar-polar and polar-polar binary and ternary systems have been tested.