BHP SU Cross-Section Trace Structure

Seismic Data

Seismic data format is same as Seismic UNIX trace data.

Horizon Data

Each sample is an event value or horizon time or depth.

Trace Headers:

Sampling Interval (dt) is always 1000

Number of Samples (ns) is number of horizons

Model Data

Sample data is a combination of model properties and times or depths.

The number of model layers is the same for each property.

Each trace contains all the property values, stored layer-by-layer, followed by all the depth/time values, followed by a bottom-model time or depth.

Trace Headers:

Sampling Interval (dt) is always 1000.

Number of Samples (ns) is number-of-layers

times number-of-properties + number-of-depths + 1.

Start Time (delrt) is the time or depth of first layer

Model Data Example

Assume model contains porosity, permeability, and seismic facies, and that there are 22 layers in the model.

Each model trace would contain:

22 samples of porosity values

22 samples of permeability values

22 samples of facies values

22 times or depths

1 bottom-of-model time or depth