1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu, China
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation and the School of Geoscience and Technology, Southwest Petroleum University, Chengdu, China
3. Seismic Anisotropy Group, Department of Geosciences, The University of Tulsa, Tulsa, OK, USA
4. Shale Gas Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, China
5. School of Science, Southwest Petroleum University, Chengdu, China