Formation evaluation

Integrated Sourceless Method Effective in Reservoir Characterization and Navigation

The authors describe a logging-while-drilling nuclear-magnetic-resonance method applied in Bohai Bay, China, as an alternative to radioactive source-porosity measurements.

LWD-NMR tool design.
Fig. 1—LWD-NMR tool design.

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.


The Caofeidian (CFD) district is in the western portion of Bohai Bay, with an average water depth of 25 m.

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