The Kansas Class 2 project was a demonstration project in an Osagian and Meramecian (Mississippian) shallow shelf carbonate reservoir in west central Kansas. Cumulative production from Mississippian carbonate reservoirs located beneath a regional sub-Pennsylvanian unconformity is over 1 billion barrels distributed over a large number of small to medium size reservoirs. Small independent producers operate many of these reservoirs. Extremely high water cuts and low recovery factors place continued operations at or near their economic limits.

Application of cost-effective reservoir description and management strategies can significantly extend the economic life of these mature peritidal carbonate fields and recover incremental reserves. Equally important is innovative dissemination of the data, methodologies, and results to foster wider application of demonstrated technologies by the numerous operators of similar fields throughout the northern Mid-continent and US. Producibility problems in Kansas Meramecian and Osagian dolomite reservoirs include inadequate reservoir characterization, drilling and completion design problems, and non-optimal primary recovery.

The project entailed integration of existing data, drilling and coring of three new wells through the reservoir interval. Descriptive core analysis, petrophysical and petrographic analysis (e.g. capillary pressure and NMR), calibration of logs and core data, and integration of existing well data into a computerized three dimensional visualization/simulation that was used to develop a digital reservoir model and management plan for the Osagian and Meramecian rocks at the Schaben site. Analysis indicates significant potential incremental reserves through targeted infill and horizontal drilling in this major producing trend.

At the Schaben demonstration site, integrated reservoir characterization provided the basis for development of a descriptive reservoir model and the framework for simulation. A publicly accessible and comprehensive digital reservoir database using existing and newly acquired data was distributed through the Internet. New data from the three new wells provided insight into fundamental reservoir parameters (e.g., core plug NMR analysis to determine effective porosity and relationship to facies). As part of the Kansas Class 2 project a number of cost-effective tools and techniques for reservoir description were developed, modified and demonstrated. These include:

  1. a new approach to subsurface visualization using electric logs ("Pseudoseismic")
  2. a low-cost easy-to-use spreadsheet log analysis software (PfEFFER)
  3. an extension of the BOAST-3 computer program for full field reservoir simulation.

The Kansas Digital Petroleum Atlas model was used to provide rapid and flexible dissemination of the project results through the Internet.

The most significant Kansas Class 2 project results are

  1. development of an on-line comprehensive digital reservoir database
  2. acquisition of additional core, electric log and test data.
  3. construction of an integrated geologic reservoir characterization using cost-effective approaches to data analysis
  4. full-field reservoir characterization and simulation using publicly available or low-cost software
  5. identification of potential incremental reserves that can be accessed through targeted infill and possible horizontal drilling
  6. development of a regional database for evaluation of potential for horizontal and targeted infill drilling in similar Mississippian reservoirs of Kansas
  7. new models for innovative technology transfer. An improved understanding of Mississippian subunconformity reservoirs in Kansas has been developed and new cost-effective techniques have been demonstrated for the identification of incremental reserves at the Schaben Field demonstration area and at similar reservoirs throughout Kansas and the Mid-continent.

Updated June 2000
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