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.
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