The west grade block of Liaohe oilfield is characterized by complex lithology,tectonics fracture and petroleum geological condition and small sedimentary coverage.

• 辽河油田辽河裂谷西部凹陷西斜坡地层岩性复杂,构造断裂破碎情况复杂,沉积范围小,石油地质条件复杂。