# Explorer Programs

This page links to CREWES interactive software applets. This software is made available to all visitors as examples of CREWES research. Source code is available only to CREWES Sponsors.

Note that you will need to have the Java runtime environment (JRE) installed on your computer in order to use these applets. As of Java Version 7 Update 51, you will also need to add http://www.crewes.org to the Java Exception Site List.

- Verify Java Version
- Where is the Java Control Panel on Windows?
- How can I configure the Exception Site List?

## Quick Links

## CREWES Zoeppritz Explorers

CREWES is pleased to offer Zoeppritz Explorer 2.2, a useful web-based applet that enables the user to visually 'explore' Zoeppritz equation solutions with various parameter inputs.

The Zoeppritz Magnitude Plotter 1.0 and the Zoeppritz Phase Plotter 1.0 are similar to the Zoeppritz Explorer, but render plots in black and white for the creation of easily publishable figures. They trade reduced functionality for increased control over plotting options.

## CREWES Spherical Zoeppritz Explorer

The Spherical Zoeppritz Explorer 3.0 calculates reflectivity from point sources rather than from plane waves.

## CREWES Energy Explorer

The Energy Ratio Explorer 1.0 calculates the fraction of energy transmitted away from the interface as a function of angle for each mode. This provides a useful perspective complementary to that of the Zoeppritz Explorer.

## CREWES Fluid Properties Explorer

The Fluid Properties Explorer produces information on pore fluids of interest in petroleum exploration. Gas Phase calculations may be carried either by using mole fraction input and employing the Peng-Robinson equation of state, or by using the gas density ratio as input employing empirical relations described by Batzle and Wang (1992). Viscosity is calculated only by the empirical equation route. Liquid Phase and Brine Phase calculations also employ empirical relations based on Batzle and Wang (1992). The Multi-Phase calculations employ simple volume fraction averaging for the density and Woods relation for the bulk modulus. The velocity is calculated from the density and bulk modulus. The viscosity is not calculated.

## CREWES Energy Ratio Plotters

The Energy Ratio Plotter 1.0 is similar to the Energy Ratio Explorer, but renders plots in black and white for the creation of easily publishable figures. It trades reduced functionality for increased control over plotting options.

## CREWES Reflectivity Explorer

The Reflectivity Explorer 2.1 enables the user to view a large number of AVO-related approximations to the P-P reflection coefficient for any combination of earth properties. The results can be displayed as functions of either angle, offset, sine-angle, or sine-squared-angle. These are all displays relevant to AVO.

A previous version (1.0) is still available at present.

## CREWES Anisotropic Zoeppritz Explorer

The Anisotropic Zoeppritz Explorer 1.0 utility lends insight into the realm of materials displaying vertical transverse isotropy (VTI) and horizontal transverse isotropy (HTI). For VTI media it can display both the exact and linearized P-wave reflection coefficients. For HTI media one can explore the behaviour of the linearized P-wave reflection coefficient and compare it with values for an isotropic earth. It features interactively adjustable anisotropy parameters (γ, δ, and ε) as well as the azimuthal angle of incidence.

## CREWES TI, HTI, and VTI Explorers

The TI explorers display reflection coefficients for an interface between two VTI media or between two HTI media. Either or both of the layers may be specified as being isotropic. Both exact and linearized reflection coefficients may be displayed. TI Explorer 1.1 and TI Explorer 1.2 call the same applet; they differ only in the symmetry of the media for which they show a display when first called.

The HTI Explorer displays the azimuthal dependence of reflection coefficients for an interface between two HTI media. Either or both of the layers may be specified as being isotropic.

The VTI Explorer 1.0 is similar to the Anisotropic Zoeppritz Explorer except that it is specialized to VTI applications, and is more flexible in how parameters may be specified.

## CREWES Interface Parameter Calculator

The InterfaceParameterCalculator 2.0 provides a convenient tool for converting between various representations of elastic interface data. One can readily convert from densities and velocities to ratios and contrasts, for instance, as is commonly done in AVO studies.

A previous version (1.0) is still available at present.