The secondary dolomite and paleokarst of the Lower Permian Series in Sichuan Basin is one of the important atectonic reserviors in the basin.

四川盆地二叠统中次岩及古岩溶是二叠统主要的圈闭储层之一。

Rich hydrocarbon accumulation area is usually associated with structure-lithology trap, fault trap and lentoid sand trap.

有利圈闭为岩性、岩性、断块及断层类型。