1. Changqing Branch of Geophysical Research Institute BGP, CNPC Xi'an China
2. Oil and Gas Technology Institute of Changqing Oilfield Branch Campany PetroChina Xi'an China
3. National Engineering Laboratory of Low Permeability Oil & Gas Fields Exploration and Development Xi'an China
4. School of Earth Science and Engineering Xi'an Shiyou University Xi'an China
5. College of Civil Engineering Guizhou University Guiyang China