Well Log Interpretation

Program Objectives

General principles of physics are developed to explain the function of modern logging tools. Log interpretation methods are described along with extensive examples. A large number of real log examples are used to show basic methods and principles in the interpretation of reservoir properties such as porosity, lithology, permeability, formation factor, saturation, and hydrocarbon type. Cross-plot and reconnaissance techniques and quick-look methods that discriminate between water, oil, and gas quickly and efficiently are also covered.

The physics of modern logging tools and their constraints and limitations of operating in the borehole environment are addressed. Electrical, radioactive, and sonic properties of rocks are also covered. Determination of porosity and mineralogy using density, neutron, and sonic logs and the applications of matrix-sensitive logs, SP, GR, SGR, and Pe are put in context of what information is critical to the professional to determine the presence of hydrocarbons and rock properties. This course is designed to provide the fundamentals of structural methodology at all scales, from regional to prospect, that are critical to exploration and development geologists and geophysicists on a daily basis. The objective is to teach the application of structural framework concepts to predict and understand trap geometry.
Course Outline
  • Invasion profile 
  • Electrical properties of rock materials 
  • Resistivity measurement tools, normal, induction, laterolog 
  • Shale-permeable zone discrimination 
  • Shale Indicator logs, SP, GR, SGR, Pe 
  • Depth measurements and control 
  • Borehole calipers 
  • Porosity-mineralogy logs, density, neutron, sonic 
  • Porosity determination in clean formations 
  • Formation resistivity factor 
  • Conductivity of different types of shales 
  • Cross-plots and mineralogy identification 
  • Partially saturated rock properties and Archie Equation 
  • Linear movable oil plot 
  • Quick-look techniques 
  • Logarithmic MOP by shallow/deep resistivities 
  • Porosity-resistivity cross-plots 
  • Permeability correlations 
  • Nuclear magnetic resonance (NMR) 
  • Use of pressure measurements 
  • Composite log evaluation using computers