Factors that predict fracture orientation in a gas storage reservoir.
Komar-CA; Overbey-WK Jr.; Rough-RL; Lambert-WG
Pres at 45th Annual Fall Meeting SPE AIME Houston, Texas 1970 Oct; :1-6
Exploratory research was conducted in a gas-storage reservoir in Hocking County, Ohio, to determine why hydraulically induced vertical fractures tend to follow a preferred direction. Surface measurements of joints, aerial photograph lineaments, and residual stress orientations were compared to directional property measurements on oriented surface and subsurface cores. These data were compared to hydraulically induced vertical fracture orientations obtained by impression packers and borehole photographs in the reservoir. Observations showed that macroscopic and microscopic features of reservoir rocks can be correlated to the preferred orientation of hydraulically induced fractures. Considering that existing theory advocates tectonic stress as the controlling factor in vertical fracture orientation, it becomes apparent that both macroscopic and microscopic features are indicators of the direction of this maximum horizontal stress as well. Using this information, the petroleum engineer can locate wells to be fractured in a pattern which will optimize reservoir performance whether for production or storage of natural gas.
Mining-industry; Gas-mixtures; Petroleum; Hydraulic-equipment; Natural-gas
OP; Conference/Symposia Proceedings
Pres at 45th Annual Fall Meeting, SPE, AIME, Houston, Texas, Oct. 4- 7, 1970, Preprint SPE 2968