a novel experimental approach for fracability evaluation in tight-gas reservoirs论文.pdf

Journal of Natural Gas Science and Engineering 23 (2015) 239 e249 Contents lists available at ScienceDirect Journal of Natural Gas Science and Engineering journal homepage: /locate/jngse A novel experimental approach for fracability evaluation in tight-gas reservoirs Daobing Wang a, b, *, Hongkui Ge a, b, Xiaoqiong Wang a, b, Jianbo Wang a, b, Fanbao Meng a, b, Yu Suo a, b, Peng Han a, b a Unconventional Natural Gas Research Institute, China University of Petroleum, Beijing 102249, Peoples Republic of China b State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, Peoples Republic of China a r t i c l e i n f o a b s t r a c t Article history: Hydraulic fracturing is an effective stimulation method for the economic development of tight-gas Received 14 November 2014 reservoirs in which extremely low matrix permeability requires complex fracture networks. Petro- Received in revised form physical/mechanical experiments and XRD/SEM analyses demonstrate that volcanic sedimentary rock is 26 January 2015 characterized by developed natural fracture, strong brittleness, stress sensitivity, AE activity, weak Accepted 28 January 2015 anisotropy, and fluid sensitivity. Fracability index is often utilized as a key parameter to evaluate the Available online 4 February 2015 ability to generate fracture networks. In this study, a new systemat