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

有圈闭为岩性、构造岩性、断块及断层类型。

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

四盆地统中次生白云岩及古岩溶是统主要的非构造圈闭储层之一。