SEISMIC SIGNATURES OF PORE CONNECTIVITY
The goal of this dissertation is analyzing medium parameters’ influence on seismic signatures, especially pore connectivity. Firstly, I use the Zoeppritz equation to analyze reflection coefficient's sensitivity to eight medium parameters; results show they all have significantly different sensitivity.
Friability is an empirical parameter introduced in General Singular Approximation (GSA) to measure the extent of pore connectivity that has the numerical range from 0 to 1. In the second part, with other assumed medium parameters, calculation results show friability has observable seismic signatures. Most of them have very large, non-monotonic, and nonlinear variations to friability. Specifically, I observe: 1, as friability increases, most stiffness-tensor components decrease; 2, most extended Thomsen's parameters decrease as friability increases.
Lastly, as a comparison to GSA, poroviscoelasticity is introduced by synthesizing Biot theory and viscoelasticity because Biot theory assumes completely connected pore space. The influence of frame inelasticity on poroviscoelastic wave dispersions, attenuations, and reflection and transmission coefficients are computed and analyzed in detail. Results show frame inelasticity has considerable influence on reflection and transmission coefficients in certain frequencies and incidence angles.