CNPC Key Laboratory of Carbonate Reservoirs Petroleum University Division 610500;
Sichuan Province Key Laboratory of Natural Gas Geology 610500;
State Key Laboratory of Oil and Gas Reservoir Geology and Exploration Petroleum University 610500;
PetroChina Southwest Oil and Gas Field Company 610000;
Southwest Geophysical Research Institute 610213;
Sichuan Basin; Lower Permian; Qixia Stage; sequence stratigraphy; three-order sequence; mound-shoal complex; carbonate platform; RESERVOIR; lithofacies paleogeography;