Program CWELL - Overview

CWELL is a crosswell modeling program for two-and-one-half dimensional layered acoustic media. Traveltime, amplitude and phase of acoustic waves are calculated using ray theory. The program uses the shooting method of ray tracing and interpolates to find the above quantities at the precise receiver locations. In this respect it is different from CSHOT1, which uses a two-point ray tracing approach.

In CWELL, the receivers are located inside a well. (In CSHOT1 the receivers are confined to the uppermost layer.) The sources may also be located in a well, or they may be given general locations anywhere within the model. Both source and receiver wells may be curved (they are splined by the program).

Direct waves, reflections, head waves and multiples can be calculated.

In order to produce wiggle traces, CWELL must be run in conjunction with CSHOT2 (see the CSHOT documentation).

CWELL accesses a number of input parameter files:

  1. file PARAM1
  2. a model file
  3. a plot colors file
  4. a receiver well file
  5. a source well file (downhole shooting)
  6. a source locations file (general shooting)

The precise format of the input parameter files is developed in the demos.

The output generated by CWELL may be any or all of the following:

  2. model/ray plot
  3. listing
  4. time data (input to CSHOT2 to produce wiggle traces)
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