shale indicator

例句：

1. 1. The shale indicators in the drilling fluid can help us determine the depth of the oil and gas reservoir.
   钻井液中的页岩指示剂可以帮助我们确定油气藏的深度。
2. 2. The shale indicators are used to identify the presence of oil and gas in the shale formation.
   页岩指示剂用于识别页岩层中是否存在油气。
3. 3. The shale indicators have a significant impact on the development of oil and gas resources in the shale formation.
   页岩指示剂对页岩层油气资源的开发具有重要影响。