METHOD AND SYSTEM FOR ANALYZING A LAMINATED SAND/SHALE FORMATION

摘要

A method for analyzing a formation, that includes plotting resistivity data points (318, 320) on a resistivity graph (300) to obtain plotted resistivity data points, and selecting a first shale point (306) on the resistivity graph (300) based on the plotted resistivity data points. The first shale point (306) represents a resistivity anisotropy of shale in the formation. The method further includes generating, for each of a plurality of shale fraction values, a first shale fraction curve (314) on the resistivity graph (300) based on the shale fraction value and the first shale point (306), and generating, for each of a plurality of sand resistivity values, a first sand resistivity curve (312) on the resistivity graph (300) based on the sand resistivity value and the first shale point (306). A hydrocarbon yielding region in the formation is identified based on the first sand resistivity curves (312) and the first shale fraction curves (314).