density log的意思|示意

Density logs are widely used in the oil and gas industry to determine the porosity of rock and soil formations. They measure the speed at which a sound wave travels through a formation and its porosity.

Density logs use a gamma-ray source to measure the density of the formation. In this process, the gamma-ray source, which is mounted on the side of the logging tool, will emit gamma rays into the formation. As the gamma rays travel down the borehole and then through the formation, they interact with the material in the formation and eventually they will reach the detector. This interaction will cause the gamma rays to lose energy, and the amount of energy lost will be proportional to the density of the formation.

The detector then measures this energy loss and calculates the density of the formation. The higher the density, the slower the sound wave travels, and the lower the porosity. The density log is then used to create a porosity log, which shows the porosity of various depths within the formation.

Density logs are important for determining the production potential of an oil and gas field. By understanding the porosity of a formation, engineers can better understand how a formation can hold fluids and gases and where the production potential of an oil and gas field may lie.