Log Type Log Name Curve Characteristics Interpretation Lithology Logs Gamma Ray & Spontaneous Potential (SP) Deflection to the right Shale Deflection to the left Sand Resistivity Logs Deep Resistivity High Hydrocarbons Tight Streaks Low porosity Low Shale Wet Sand Separation between the resistivities Formation and drilling fluids are different Formation is permeable Porosity Logs Density … Continue reading Short Cut Interpretation
Tag: Gamma Ray
Gamma Ray
Measures the natural resistivity of the formations in the borehole. Good for the identifying lithology and correlation purposes. The GR log usually reflects the shale content of the formations because of the concentrations of radioactive materials in the shales/clay. Shale free sandstones and carbonates have low gamma ray values unless contaminants are present. They are … Continue reading Gamma Ray