This service commonly uses a radioactive source to measure the percentage of the formation occupied by pore spaces. The log indicates if the hydrocarbon in an area is oil or gas. Almost all oil and gas produced today comes from pore spaces. The production value of a reservoir is dependent on the percentage of hydrocarbon saturation in those pore spaces, i.e., the percentage of the pore space that is occupied by hydrocarbon rather than water.
LWD Service Logs