Understanding NMR logs in shales

摘要

Scientists are attempting to explain the fast relaxation times in unconventionals. In shale plays, on the opposite spectrum from the "factory drilling" approach is the "engineered well," where science plays a role in determining the best spots to land the lateral and perforate the well. Range Resources has perfected this technique in the Marcellus and Utica shales, first using focused ion-beam scanning electron microscope technology but later relying on nuclear magnetic resonance (NMR) logs to correctly land its laterals.