Method of characterizing hydrocarbon reservoir fractures in situ with artificially enhanced magnetic anisotropy

摘要

Reservoir fractures are characterized directly in situ without need to acquire and analyze formation sample cores. A magnetic fluid is injected into an isolated section of the reservoir. The magnitude and directional properties of the enhanced magnetic susceptibility in the section where magnetic fluid injection occurs is measured with a down hole magnetometer. Logs obtained of the enhanced magnetic susceptibility are analyzed to characterize fractures, and petrophysical properties of interest, such as porosity, permeability, and permeability anisotropy of the formation in the vicinity of the fluid injection.