Wedge Models for Resolution Investigations

Greg Partyka [USP Team, BP]

April, 2007

Background

This work builds on the previous wedge modeling that was performed in 2001.

Those previous wedge-models were built to facilitate examination of the spectral characteristics or layer-stacking combinations that are more complex than the simple "one-layer embedded inside a background of different impedance". They were however, limited to symmetric and binary layer-stacking.

The model set built here, yields layer-stacking combinations that are symmetric, asymmetric, binary, and non-binary.

2001 Model Specifications

Impedance of background = 20,000; impedance of reservoir = 18,000 (10% contrast)
Gross wedge geometry remains the same for all models.
Number of layers ranges from 1 to 10, by 1.
Net-to-gross ranges from 10% to 100% by 10%.
Layers are evenly distributed (vertically) within the gross package.
Sample interval = 0.5 ms.

Image of model-set

2007 Model Specifications

Impedance of background = 0; impedance of reflective material = 1
Gross wedge geometry remains the same for all models.
Number of layers ranges from 1 to 10.
Net-to-gross ranges from 10% to 100%.
Layers are distributed both evenly and unevenly (symmetrically and asymetrically) within the gross package.
There are 820, 200 trace Records in this model-set. Records 1-to-410 contain binary layering (i.e. background impedance=0, reflective material impedance=1). Records 411-to-820 contain a non-binary (gradational) version of the binary layering present in Records 1-to-410.
Sample interval = 1 ms.

Images of model-set:

Download USP Scripts

To build an impedance and reflectivity version of this model-set, you will need to copy the contents of the scripts directory, and run "job1".

The resulting impedance and reflectivity models sets together are 740 MBytes in size.