Reservoirs and Estimation of Carboniferous-Triassic in Southern Lichuan Synclinorium,West Sichuan Province

The Lichuan synclinorium is located on the border between Chongqing city and Sichuan Province,it in carboniferous Triassic exists main carboniferous reservoir of Sichuan Chongqing gas area,and thick reef cap dolomite with good reservoir conditions has been found in Changxing formation of Permian at Qiyue Mountain. Reservoir conditions of main reservoirs in the Fuchengzhai member,Huanglong formation,Carboniferous,and Maokou formation limestone,Permian and oolitic limestone of Dasan member,Daye formation,Triassic turns well from east to west.Thus the west flank of the synclinorium,and both sides of the anticline of the Qiyue Mountain are good areas for gas reservoir exploration,moreover,should trap exists in the central base,it would be the most hopeful for obtaining gas.