We developed a method that uses diffracted wave data to address the issue of precisely characterizing small geological structures in a reservoir and demonstrated its effectiveness using model calculations. The method was implemented to characterize a fractured reservoir and igneous rock intruded in a carbonate reservoir. Two diffraction attributes were analyzed to precisely characterize the fine, small-scale geological structures therein. Principal component analysis was performed to extract diffraction data from seismic wave fields, and the reflection and diffraction wave fields were separated based on the kinematics and dynamics of the diffracted waves. The resulting diffracted wave fields provided an excellent basis upon which to assess the distribution of small geological structures in the study area. This proved, experimentally, that our diffraction-based method has the potential to characterize the distribution of small geological structures precisely and holistically.

Abstract:NBCO bars were textured using zone melting method under low oxygen partial pressure. By means of electron backscattered diffraction (EBSD) method, quantitative texture analysis of zone-melted NBCO samples was studied. High-quality Kikuchi patterns were obtained, allowing the automated mapping on samples. The EBSD results are presented in the form of local orientation maps, phase maps and pole figures, revealing the crystal growth characteristics of the zone melted sample and the distribution of misorientations for the NBCO phase.