Determination of gravity by observation of density variations in gases

摘要

Apparatus to measure gravity comprising means to measure density variations in a material. Apparatus to measure gravity comprising means to measure the distribution of masses in a material. The material may be a gas comprised of one molecular species, a gaseous mixture having at least two gaseous species, liquids, or other material. Laser light is absorbed by the materials, and the re-emmitted light is measured to determine gravity in one method of measurement. Other optical processes to measure gravity are described. Other physical parameters are measured to determine gravity. Density variations measured by microwave processes and nuclear processes are also described. Apparatus are described to provide sufficiently accurate measurements of gravity to be useful for routine measurements of gravity from within a borehole in the earth to locate and quantitatively identify the amount of gas present in a hydrocarbon reservoir.