1. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
2. National Engineering Laboratory of Low Permeability Oil and Gas Field Exploration and Development, Xi’an 710018, China
3. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi’an 710018, China
4. Exploration Department, PetroChina Changqing Oilfield Company, Xi’an 710018, China