Departure Curves : Graphs that show influence of a variable on the basic measurement; e.g., temperature, hole diameter, mud resistivity, bed thickness, adjacent bed resistivity, etc
George E. King Engineering, 5000 Oilfield Terms: A Glossary of Petroleum Engineering Terms, Abbreviations and Acronyms, US 2010. http://gekengineering.com/Downloads/Free_Downloads /Glossary_of_Petroleum_Engineering_Terms_25_August _2010.pdf, (Oil - Amer) {593}