1) The document discusses evaluating well logs in high density cesium formate drilling mud. Cesium formate mud poses challenges for log evaluation due to its high density, electrical conductivity, and nuclear properties. 2) A novel method is presented to correct density logs measured in cesium formate mud. It uses the linear relationship between measured density and photoelectric effect to calculate the invaded zone saturation and true formation density. 3) The method involves using photoelectric measurements to correct the measured density log and calculate saturation of the invaded zone, then applying density-porosity relationships to obtain the final porosity measurement.