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. Department of Geosciences, Seismic Anisotropy Group, University of Tulsa, Tulsa, OK, USA
4. School of Science, Southwest Petroleum University, Chengdu, China
5. Shale Gas Research Institute, Petro China Southwest Oil and Gasfield Company, Chengdu, China