Abstract and Introduction This paper is the second half and an integral part of a previous presentation entitled: " Interpretation, Averaging and Use of the Basic Geological-Engineering Data, STATIC RESERVOIR DATA (Part I)," presented at the 17th Annual Technical Meeting of The Petroleum Society of CIM, in Edmonton, Alberta, in May 1966; published in JCPT, October-December, 1966 and republished by SPE of AIME as Paper SPE 1974 (1967). The purpose of these two complemental papers is to emphasize that taking, assembling and averaging of the basic data for further use in an analysis of a reservoir requires a profound knowledge of many of the specialized disciplines of modern geology and petroleum engineering. " DYNAMIC RESERVOIR DATA (Part II)," presented in this particular paper, investigates the level of energy, the potential and also the forces contained or induced into the reservoir. These aspects are specifically discussed under the following major subheadings:Pressures to be Used in Analysis of a Reservoir:datum,depth of measurements,original reservoir pressure,bubble point pressure,pressures taken during the production life-averaging,superposition theorem,variable pressures-stepwise curve, and,incremental vs partial pressure drops.PVT Data: (a) sampling, (b) laboratory results, and (e) adjustment to different pb.Resume on Dynamic DataBibliographic References