Abstract: Acoustic measurements are obtained and combined with some identification of regions that are expected or believed to be cemented. Based at least in part on this information, a processing unit derives an annular material classifier that can identify those measurements characteristic of the cemented regions (including regions cemented with a resin cement formulation), and that further applies the classifier to the measurements to generate a cement log that can be displayed to a user. Cross-plots of waveform amplitude, acoustic impedance, and the derivative of acoustic impedance, have revealed that resin cement, for example, has characteristic acoustic properties that form a small cluster within the range of expected measurements. For improved identification reliability, such clusters can be identified adaptively.