State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology Chengdu 610059 ChinaInstitute of Sedimentary Geology Chengdu University of Technology Chengdu 610059 China;
Institute of Sedimentary Geology Chengdu University of Technology Chengdu 610059 China;
School of Mines Inner Mongolia University of Technology Hohhot 010051 China;
Ordos Basin; Ordovician Majiagou Formation; dolomite; evaporites; dolomitization; dissolution;