非稳定井流解析法评价深层地下富钾卤水可采资源量

摘要

In a sedimentary basin, sometimes there is only one well tapping subsurface brines in a deep-seated brine-bearing aquifer. If reasonable generalization of hydrogeological conditions is carried out and hydrogeological parameters of the aquifer are obtained, the extractable brine resources of the well can be evaluated using the analytical methods of unsteady-state flow of a pumping well by attaining the time when the hydraulic head of the well drops to the upper confining bed of the aquifer. The extractable K-rich brine resources of the You 1 well in the Youguanding brine-bearing structure and the Chuan 25 well in the Luojiaping brine-bearing structure in the Sichuan Basin are estimated as 7. 495 × 106 m3 and 8. 951 × 106 m3, respectively, which are regarded as the preliminary data of the brine resources.%在沉积盆地内有时只有一个钻井揭露深层储卤层地下卤水。如果能合理地进行水文地质条件的概化并了解储卤层的有关水文地质参数,可以利用非稳定井流解析法通过求得钻井卤水水头降低至储卤层顶板所需的时间来估算钻井的卤水可采资源量。据此求得四川盆地油罐顶储卤构造油1井和罗家坪储卤构造川25井的富钾地下卤水可采量分别约为7.495×106 m3和8.951×106 m3,作为初步的卤水资源量数据。