FULL-WAVEFORM INVERSION USING ACOUSTIC LOGGING DATA

Abstract

The thesis contains six chapters to illustrate the products of this Ph.D. research of FWI (full-waveform inversion) using acoustic logging data. The first chapter briefly introduces necessary background knowledge, including the importance of the underground velocity model, acoustic logging, and FWI. The second chapter is composed of two parts: a detailed literature review of methods for processing the acoustic logging data; then a thesis road map highlighting the current state of the art of the subject matter and justifying the needs of the current research. The third chapter first elaborates on the derivation of the FWI algorithm in the 2D cylindrical coordinates, then examines the algorithm through synthetic acoustic logging data tests. The fourth chapter illustrates the applicability of the FWI algorithm using field acoustic logging data. In addition, the difficulties of matching the whole waveform of the field and synthetic data are shown in this chapter. The fifth chapter focuses on analyzing the factors that may affect the waveform of the simulated acoustic logging data through the methods of the analytical solution. The sixth chapter concludes the research and proposes future works.