METHOD FOR IDENTIFICATION OF HYDROCARBON RESERVOIRS

摘要

Method for geophysical prospecting for thin hydrocarbon-filled reservoirs based on analysis of anisotropy in electrical resistivity of the target formation. A remote resistivity mapping survey preferably optimized for anisotropic mapping is performed. High values in electrical anisotropy along with high vertical resistivity of a formation correspond to presence of thin resistive layers. In addition, the presence of conductive layers such as shales will decrease horizontal resistivity and further increase the value of anisotropy. In contrast, thick resistive rock bodies such as salt diapirs and volcanic rocks will have high values of both horizontal and vertical resistivity, but low anisotropy values.