Ozkan and Raghavan Solution for Constant-Head Tests in Fractured Aquifers

Well-aquifer configuration for Ozkan and Raghavan (1991) constant-head test solution for vertical fracture

A mathematical solution by Ozkan and Raghavan (1991) is useful for determining the hydraulic properties (hydraulic conductivity, specific storage, hydraulic conductivity anisotropy and fracture length) of fractured aquifers with a single vertical fracture intersecting the test well. Analysis involves matching the Ozkan and Raghavan solution to discharge data collected during a constant-head test.

AQTESOLV provides visual and automatic methods for matching the Ozkan and Raghavan solution to constant-head test and recovery test data. This easy-to-use and intuitive software promotes rapid and accurate determination of aquifer properties.

Assumptions

The following assumptions apply to the use of the Jacob and Lohman solution:

  • aquifer has infinite areal extent
  • aquifer has uniform thickness
  • aquifer potentiometric surface is initially horizontal
  • fractured aquifer represented by anisotropic system with a single plane vertical fracture that fully penetrates aquifer
  • flow is unsteady
  • water is released instantaneously from storage with decline of hydraulic head
  • diameter of control well is very small so that storage in the well can be neglected

Solution
Options

provides the following options for the Ozkan and Raghavan constant-head test solution for a vertical fracture:

  • recovery

References

Ozkan, E. and R. Raghavan, 1991. New solutions for well-test analysis problems: Part I-analytical considerations, SPE Formation Evaluation, Sept. 1991, pp. 359-368.