Analysis of Stratigraphic and Production Relationships of Devonian Shale Gas Reservoirs in Ohio. Annual Report October 1985-September 1986

摘要

The Devonian shales in Lawrence County, Ohio, have been analyzed to determine the relationships between natural gas production, geologic factors, and well-completion techniques. The study was initiated by compiling a comprehensive computerized Devonian shale database for Lawrence County. A cross-section network, eight isopach maps, and two structure maps were constructed to determine stratigraphic and structural controls on the Devonian shales. Gas shows, completion intervals, stimulation techniques, and production data were analyzed to characterize Devonian shale reservoirs in Lawrence County. Several structural features identified by the mapping indicate areas of increased fracturing where higher Devonian shale gas production may be expected. Comparison of isopotential maps and cumulative-production maps showed little or no correlation between initial production rates and long-term performance of Devonian shale wells.