GEOL 4320/6320 Exercise 7: Evaluation of possible petroleum in Crowistan|
We previously examined the Bulldawg Petroleum Company's Concession #1 in Crowistan from a geological perspective, using logs from twelve boreholes. Those twelve boreholes had been drilled just before a revolution that terminated all activities by petroleum companies in Crowistan. We have also learned that all records of previous activity and all plans for further development were destroyed in the revolution, so that there is presently no knowledge of accumulations or potential targets for further exploration. However, our sources have given us higher-quality logs than those previously available, and we now have a thirteenth log from a borehole outside our concession area.
Your assignment is the following:
1) Make a NW-SE cross-section of four logs from newly-available Borehole 3356 to Borehone 2169. Your cross-section should have a vertical exaggeration of no more than 5.0.
2) Write a statement of no more than 300 words reporting on the petroleum potential of the Bulldawg Petroleum Company's Concession #1 in Crowistan. If you conclude that there is conventional petroleum evident from the information presently available, your statement should indicate an estimate of recoverable oil and the nature of the reservoir(s) and trap(s) in which it is located, and it should be accompanied by a map showing the geographic extent of the accumulation. If you calculate volumes of recoverable oil, report them in barrels and show your work in a separate document. For purposes of consistency, let's assume a water saturation of 25%, a recovery factor of 26%, and a gas-oil ratio of 500. If you conclude that there are possible conventional accumulations that might exist but remain unproven, indicate the nature of the reservoir(s) and trap(s), and indicate a location for a proposed well, with the location precise to tenths of units in the Crowistan Geodetic System. If you conclude that there are possible unconventional hydrocarbons that might exist but remain unproven, indicate their nature and distribution in your report, and show their distribution on your map.
The assignment thus requires at least a cross-section and written statement, and may additionally require a map, and may additionally require volume calculations.
The logs now available from the Emirate are the following: