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Gravitational Stability of the Interface in Water Over Steam Geothermal Reservoirs

机译：蒸汽地热储层中水界面的重力稳定性

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摘要

Stability of a geothermal system is considered in a case when the water layer lies over the layer of superheated vapor in a stratum having relatively low permeability. This stratum locates between two parallel high permeable layers. Under the assumption of smallness of advective energy transfer as compared with the conductive one, the stationary distribution of the characteristics in the stratum with an interface of phase transition is obtained. The interface separates the domains occupied by water and vapor. Investigation of normal stability of the interface shows, that stable configurations in the geothermal system under consideration exist within the range of permeability values bounded by k ～ 0.6 x 10~(-15) m~2 from above. The most unstable configurations occur to be the quiescent states when the permeability exceeds a certain threshold. A sufficiently high value of permeability, satisfying the criterion of smallness of the advective energy transfer as compared with the conductive one makes it possible to explain the existence of a wide class of stable natural geothermal reservoirs, where the vapor layer underlies the water one.
机译：在水层位于渗透率相对较低的地层中，水层位于过热蒸汽层上方的情况下，可以考虑地热系统的稳定性。该地层位于两个平行的高渗透层之间。在假设对流能量转移比传导能量小的情况下，获得了具有相变界面的地层中特征的平稳分布。界面将水和蒸气所占据的区域分开。对界面正常稳定性的研究表明，所考虑的地热系统中的稳定构型存在于从上方以k〜0.6 x 10〜（-15）m〜2为界的渗透率值范围内。当磁导率超过特定阈值时，最不稳定的配置出现为静态。与传导性相比，足够高的渗透率值满足对流能量转移的小标准，这使得可以解释存在一类稳定的天然地热储层，其中蒸汽层是水的基础。

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