| abstract |
A parameter of a reservoir, such as an oil, gas, or water reservoir, is determined by measuring a magnetic susceptibility of magnetic particles added to the reservoir, and then correlating the measured magnetic susceptibility to at least one value associated with a parameter of the reservoir. The correlating process compares predetermined parameter information that is a function of magnetic susceptibility to the measured magnetic susceptibility to determine at least one value that is associated with the at least one parameter of the reservoir. The reservoir parameters may include fluid permeability, permeability anisotropy, fracture location, and fracture anisotropy. In some embodiments, the magnetic particles contain manganese or zinc doped iron-oxide particles. |