density log

n, = gamma-gamma log
measures electron density within lithologic units which is related to their bulk density. The wireline tool records the intensity of gamma radiation (in counts per second) from a nuclear source within the tool after it has been attenuated and backscattered by lithologies within the borehole. Due to the distinctly low density of coals, the density log is essential in coal exploration for identifying coal seams and coal-seam partings. The bias/ resolution of density logs can be affected by source-detector spacing (closer spacing increases resolution), borehole size, and irregularities (see caves or washouts), and the presence of casing and logging speed.

ASTM D121-09a Standard Terminology of Coal and Coke. 2014.

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