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====Method====
====Method====
The method of estimating porosity from the density requires determining the matrix density (ρ<sub>ma</sub>), the [[density log]] reading (ρ<sub>b</sub>), and the fluid density (ρ<sub>fl</sub> at the depth of interest. The matrix density is determined by the lithology. Normally, sandstone is 2.65 g/cm<sup>3</sup>, limestone is 2.71 g/cm<sup>3</sup>, and [[dolomite]] is 2.87 g/cm<sup>3</sup>. The fluid density is dependent upon the salinity of water and the density of hydrocarbon. Freshwater has a density of 1.0 g/cm<sup>3</sup> and saltwater approximately 1.1 g/cm<sup>3</sup>. Hydrocarbon density can vary widely from 0.05 g/cm<sup>3</sup> for gas at low pressures to nearly 1.0 g/cm<sup>3</sup> for certain oils. A typical value for oil is 0.8 g/cm<sup>3</sup>.
The method of estimating porosity from the density requires determining the matrix density (ρ<sub>ma</sub>), the [[density log]] reading (ρ<sub>b</sub>), and the fluid density (ρ<sub>fl</sub> at the depth of interest. The matrix density is determined by the lithology. Normally, sandstone is 2.65 g/cm<sup>3</sup>, [[limestone]] is 2.71 g/cm<sup>3</sup>, and [[dolomite]] is 2.87 g/cm<sup>3</sup>. The fluid density is dependent upon the salinity of water and the density of hydrocarbon. Freshwater has a density of 1.0 g/cm<sup>3</sup> and saltwater approximately 1.1 g/cm<sup>3</sup>. Hydrocarbon density can vary widely from 0.05 g/cm<sup>3</sup> for gas at low pressures to nearly 1.0 g/cm<sup>3</sup> for certain oils. A typical value for oil is 0.8 g/cm<sup>3</sup>.
The density response equation is
The density response equation is