Seismic Amplitude Variations Caused By Tuning In Simple Wedge Models

Seismic modelling is an important exploration tool<br>to analyse the effects of geologic variability on<br>seismic response. This study focuses on the subject<br>of vertical resolution. Tuning curves for a series<br>of simple wedge models were determined by measuring<br>the amplitude of the reflections from the top and<br>base of a sandstone wedge as a function of layer<br>thickness. Modifications to the simple, blocky<br>sandstone model are presented, which simulate<br>reservoir heterogeneities such as shaly interbeds.<br>It is shown that even subtle charqes in the<br>compisition and acoustic impedance relationship<br>between the sandstone and its shale interbeds can<br>significantly alter the tuning curve.