Case Study: US Land Well Drilling Company differentiates gas and tight zones with SLB Pulsar multifunction spectroscopy logging

Pulsar Multifunction Spectroscopy Logging Differentiates Gas and Tight Zones in Cased Well

SLB helped a US Land Well Drilling Company address the challenge of differentiating alternating gas-bearing low-porosity zones and tight shaly sand zones in a cased well with more than 2 in. of cement. The company wanted a fuller petrophysical interpretation even though openhole logs were already available, and SLB recommended its Pulsar multifunction spectroscopy service for a standalone cased-hole analysis.

SLB used the Pulsar multifunction spectroscopy service, including the fast neutron cross section (FNXS) measurement, to correct for the thick light cement and distinguish gas-filled porosity from tight zones. The run identified and quantified gas-bearing zones at X,270 to X,330 ft while separating them from a very low porosity interval at X,160 to X,180 ft, providing a reliable one-run interpretation that streamlined logging operations in the cased well.