Geological characteristics and exploration potential of the coal measure gas from Shan 2 of the Shanxi formation in the eastern Ordos Basin oleh Wei-Bo Zhao, Wei-Bo Zhao, Hui Zhang, Hui Zhang, Yun-He Shi, Yun-He Shi, Xun-Xun Fu, Xun-Xun Fu, Jie Hui, Jie Hui, Xue-Yuan Jing, Xue-Yuan Jing