1. Extra-low Permeability Oil Reservoir Research Institute Changqing Oilfield Company, Petro China Xi-an,
2. Research Institute of Exploration and Development Southwest Oil and Gas field Company,
3. Extra-low Permeability Oil Reservoir Research Institute Changqing Oilfield Company,
4. Extra-low Permeability Oil Reservoir Research Institute Changqing Oilfield Company, Petro China Xi-an, Shaanxi