Evaluation of Devonian shale gas reservoirs
The evaluation of predominantly shale reservoirs presents a problem for engineers traditionally educated either to correct for or to ignore such lithologic zones. Currently accepted evaluation techniques and their applicability are discussed to determine the best way to forecast remaining recoverable gas reserves from the Devonian shales of the Appalachian basin. This study indicates that rate/time decline-curve analysis is the most reliable technique and presents typical decline curves based on production data gathered from 508 shale wells in a three-state study area. The resultant type curves illustrate a dual- (or multiple-) porosity mechanism that violates standard decline-curve analysis guidelines. The results, however, are typical not only for the Devonian shales but for all naturally fractured, multilayered, or similar shale reservoirs.
- OSTI ID:
- 6775289
- Journal Information:
- SPE (Society of Petroleum Engineers) Reserv. Eng.; (United States), Vol. 2:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
04 OIL SHALES AND TAR SANDS
29 ENERGY PLANNING
POLICY AND ECONOMY
APPALACHIA
NATURAL GAS DEPOSITS
OIL SHALE DEPOSITS
BLACK SHALES
GAS YIELDS
NATURAL GAS WELLS
PRODUCTION
SHALE GAS
CALCULATION METHODS
FORECASTING
RESERVES
DATA ANALYSIS
DEVONIAN PERIOD
FRACTURED RESERVOIRS
GRAPHS
LITHOLOGY
POROSITY
RECOMMENDATIONS
RELIABILITY
TIME DEPENDENCE
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
CHATTANOOGA FORMATION
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
GASES
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
MATERIALS
MINERAL RESOURCES
NORTH AMERICA
OIL SHALES
PALEOZOIC ERA
RESOURCES
USA
WELLS
YIELDS
030100* - Natural Gas- Reserves- (-1989)
040100 - Oil Shales & Tar Sands- Reserves & Exploration- (-1989)
294003 - Energy Planning & Policy- Natural Gas
294004 - Energy Planning & Policy- Oil Shales & Tar Sands