Analysis of Devonian Shale Gas-Production Mechanisms

摘要

Work was concentrated on the Devonian shales in 3 Ohio counties: Licking, Lawrence, and Meigs. The Devonian shale was determined to be a multi-porosity system, with a 1% matrix porosity and 10 exp -5 to 10 exp -6 md. There is a qualitative relation between the stress-ratio ang the intensity of fracture spacing. Five well stimulation techniques were evaluated: conventional well-bore shooting (r/sub w/ = 1.8 ft), an extensive radial stimulation (k/sub w/ = 30 ft), a small hydraulic fracture of 300 ft half-length, a large hydraulic fracture of 1000 ft half-length, and a combined radial stimulation and hydraulic fracture. Three of the six partitioned areas could contain up to 3.6 TcF of Devonian shale gas reserves. 43 figures, 11 tables. (ERA citation 08:004192)