INVERTRACEPLUS

InverTracePlus transforms seismic stacks to P-impedances, otherwise known as acoustic impedance. P-impedance can be converted to porosity and / or lithology, based on available petrophysical information. When the inputs are angle or offset stacks, the outcome is angle dependent or elastic impedance, although these inputs are usually handled by RockTrace® Simultaneous AVO Inversion.

Constrained Sparse Spike Inversion

In many geological environments acoustic impedance has a strong relationship to petrophysical properties such as porosity, lithology, and fluid saturation. Moreover, the acoustic impedance models are more readily understood (versus seismic attributes) by all members of the asset team, and can enable better overall communication within the team.

The Constrained Sparse Spike Inversion (CSSI) algorithm is the centerpiece of InverTracePlus and is the state of the art implementation of non-linear sparse spike technology. InverTracePlus produces high quality acoustic impedance volumes from full or post-stack seismic data. The four output volumes are:

• Full Bandwidth Impedance
• Band-Limited Impedance
• Reflectivity model
• Low frequency component

These volumes are used in unique workflows to design better drilling programs, resulting in higher productivity well.

A key test of any seismic inversion algorithm is its ability to solve the wedge model. InverTracePlus clearly is able to solve the wedge model as shown in these images.

InverTracePlus Benefits

Inversion of seismic data to impedance improves exploration and reservoir management success, producing more hydrocarbons with fewer, more highly productive wells. InverTracePlus results can deliver significant advantages to interpreters:

• P-impedance is a layer property, whereas seismic data is an interface property
• Higher resolution through reduction of the wavelet effects, tuning and side lobes
• P-impedance is a physical property of the rock, and can therefore be directly referred to well log data
• P-impedance can often be directly related to Porosity through petrophysical cross-plots
• Seismic Inversions can make determinations of stratigraphy easier due to the reduction of tuning effects

InverTracePlus Advantage

• The non-model-based approach uniquely determines the degree of sparsity at the time of inversion for optimal results from the given seismic data.
• The inversion algorithm is blind to any input well log information in the seismic band. All wells are blind wells and ready to be used for QC.
• Wavelet estimation automatically QCs all estimates for their ability to invert the seismic data from which they were determined. Low Frequency Models used to place the inversion in a geologic context are the most reliable available.