oil gradient line 石油梯度线
The impact of starting pressure gradient must be considered due to existence of starting pressure gradient and recovery difficulty during the development of low permeability oil reservoirs.
低渗透油田由于存在启动压力梯度，开采难度很大，因此，在低渗透油田开发时必须考虑启动压力梯度的影响。
Terrestrial stress is a main control on hydrostatic head of reservoir, and its gradient powers oil, gas and water migration.
地应力是影响储层沉积水水头的主要因素，地应力梯度是油气水运移的主要驱动力。
Multiple tests can be performed to measure formation pressure, and the formation pressure gradient can be established, accordingly, interface between oil, gas and water can be identified.
可以进行多次压力测试以建立地层压力梯度，从而判断油、气、水界面。
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