Patent ID: 6950748
Filing Date: 2005-09-27
Classification: G01V

Abstract:
1. A method for determining a surface formation property, comprising: determining a volume fraction of a layer in a multi-electrical-layer model for an anisotropic region of the formation, wherein the multi-electrical-layer model includes a relative-lower-resistivity layer and a relative-higher-resistivity layer and the determining is based on a resistivity measurement; determining a resistivity for the relative-lower-resistivity layer and a resistivity for the relative-higher-resistivity layer based on the volume fraction and bulk resistivity measurements of the anisotropic region, wherein the bulk resistivity measurements include a horizontal resistivity measurement or a vertical resistivity measurement; and determining the formation property based on the volume fraction, the resistivity of the relative-lower-resistivity layer, the resistivity of the relative-higher-resistivity layer, a porosity measurement of the anisotropic region, and the bulk resistivity measurements.