* *液(或“孔隙”)的压力并不仅仅取决于静水压力——它还取决于地层学,流体内容和岩石的地质历史。* *液体“堆栈”可以被认为是一个(大部分)连接的流体、盐水和碳氢化合物。岩石“堆栈”同样是一个相互联系的身体。流体栈定义了一个典型的软孔隙压力下限;岩石栈定义了艰难的上界。在实践中,我们不经历静岩压力毛孔因为在某种程度上的压力低于静岩压力,我们找到了_fracture pressure_。如果孔隙压力达到这个水平,岩石断裂和压力平衡。这是背后的机制(诱导水力压裂、水力压裂)(https://en.wikipedia.org/wiki/Hydraulic_fracturing)。* *但孔隙压力没有静水。* *(“高压”或“过压”)(https://en.wikipedia.org/wiki/Geologic_overpressure)或(抽空)(http://www.glossary.oilfield.slb.com/Terms/u/underpressure.aspx)可能发生如果一层地层异常紧张,例如盐,和多孔形成经历快速隆起或埋葬。我们也可能离开静水压力,孔隙流体的密度变化,与盐度或气体饱和度为例。 [![enter image description here][1]][1] This cartoon shows pressure measurements (green) in a gas well. The other trends can be computed from models or data (for example the bulk density log). The shallow part of the well is hydrostatic; the deeper section shows overpressure. Natural gas is low density, so the gas zone shows a different trend. Clearly there will be a potentially dangerous pressure kick as the drill penetrates the top of the reservoir. If the gas trend were to hit fracture pressure, the trap would leak and the hydrocarbons would escape — a common natural phenomenon. 
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