petrographic variation

• 岩相变化

petrographic variation的用法和样例：

例句

1. The fracture density and their opening status controll the permeability and throughput of volcanic reservoirs and change along with the variation in lithology and lightfaces.
   裂缝的密度和开启程度是渗流性和产能主控因素，其密度和充填程度随岩性岩相变化而变化。