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Interpretation of Well Logs

Competency Statement:

Use resistivity, radioactive, acoustic, other wireline well logs, and well samples and cores to interpret stratigraphic and petrophysical characteristics of subsurface formations. Determine basic petrophysical properties and extent of potential petroleum reservoirs.

Learning Objective:

  • Describe common log responses for source, reservoir and seal units
  • Describe common log patterns that define reservoir fluid content
  • Calculate clay volume, porosity and water saturation from well logs in appraisal wells Gama 2, 3, and 4
  • Apply log interpretation methods and core information to determine porosity, permeability, and boundaries of the petroleum reservoir on the Gama Structure
  • Validate log response using core and well cuttings.

Assignment Instruction:

Beta Petroleum has drilled the exploration well Gama 1 on the Gama structure in the New Basin. As the Operations Geologist, you have carried out the initial Quick Look evaluation of the well logs at the wellsite.

Based on the log interpretation results of Gama 1, you will make recommendations to company management regarding production testing of Gama 1 and the appraisal strategy for the Gama structure. Base your recommendations on the geology, depositional environment and uncertainties associated with the Gama structure.

You will be on the well site for the drilling and logging of each appraisal/development well. You will make the initial interpretation regarding the fluid distribution in each well and calculate clay volume, porosity and water saturation. Based on the results of each well, you will make recommendations to management on further drilling to determine the extent of hydrocarbons in the Gama Structure.

Gama Structure with well locations