Patent ID: 6243650
Filing Date: 2001-06-05
Classification: G01V

Abstract:
A method of determining the net thickness of a reservoir bed, comprising the following steps:a) filtering a set of seismic data with a plurality of band pass filters, wherein the set is selected from the group consisting of normal moveout corrected and offset stacked seismic traces, or angle stacked seismic traces, with each filter designed to have a common lower frequency f.sub.L, and progressively increasing upper frequency f.sub.Ui to generate filtered seismic traces;b) extracting amplitudes from the group consisting of the filtered seismic traces or the energy envelope of the filtered seismic traces, using a method selected from the group consisting of either a sample-by-sample method or a lobe method, wherein the extracted amplitudes and their corresponding frequencies are A.sub.i and the f.sub.Ui ;c) determining the gross reservoir thickness .DELTA.t and the thickness of the non-reservoir material .SIGMA..delta..sub.1, using the extracted amplitude frequency pairs A.sub.i and the f.sub.Ui ; andd) determining the net thickness of the reservoir by ##EQU64##