This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 202420, “Sourceless Method Case Study: Integrated LWD NMR and LWD Azimuthal-Resistivity Application in Low-Resistivity, Low-Contrast Reservoir in Bohai Bay,” by Meng Zhu, Yunjiang Cui, and Jinxiu Xu, CNOOC, et al. The paper has not been peer reviewed. The use of radioactive-source porosity measurements is strictly prohibited in Bohai Bay, China. As an alternative, logging-while-drilling nuclear magnetic resonance (LWD-NMR) has been applied. In one block of the Bohai Bay field, identifying and quantifying hydrocarbon reservoir sections is a major challenge because of little resistivity contrast between reservoirs and water zones. LWD-NMR technology, and an azimuthal resistivity tool, is able to solve this challenge. Introduction The Caofeidian (CFD) district is in the western portion of Bohai Bay, with an average water depth of 25 m. The formation sequence from top to bottom is Minghuazhen (MHZ), Neogene Guantao (NG), Dongying (DY), and Proterozoic. The CFD-S structure is a low-amplitude anticline developed on the background of the basement uplift. It is controlled by the ancient geomorphology of buried hills. The main oil-bearing strata are MHZ, NG, and DY (the E3d formation). A comprehensive analysis indicates that the DY is a delta deposit with a lithology of fine- to very-fine-grained sandstone, well sorted and mainly muddy cemented. The E3d formation includes two oil layer groups (E3dI and E3dII). The E3dII layer is the developing reservoir studied. The physical properties of the E3dII layer reservoirs are mainly medium and low permeability and are detailed in the complete paper.