含油气沉积盆地深部地下水水化学场分布特征研究

RE5EARCH ON HYDROCHEMCAL FIELD DISTRIBUTION OF THE DEEP GRoUNDWATER IN THE SEDIMENTARY BASIN WTHOIL ANDGAS

根据含油气沉积盆地深部地下水水化学特征，利用Ｐｉｔｚｅｒ模型、质量平衡模型及溶度积计算的数学模型，对我国东部沉积盆地深部地下水的化学场进行了定量研究。克服了传统水文地球化学模型在研究中一高盐度地下水中化学组分分布及其存在形式方面的限制，对盆地深部（１１００～２０００ｍ）中、高盐度地下水中的主要指示性矿物苏打（ＮａＨＣＯ＿３）和石膏（ＣａＳＯ＿４．２Ｈ＿２Ｏ）的饱和程度进行了定量评价，以此研究沉积盆地中与石油运移聚集有关的地下水水动力场的分布特征，并为研究含油气盆地中石油运移聚集条件提供了有效研究方法。

On the basis of the hydrochpmical characteristics of the deep groundwaterin the sedimentary basins,this paper researches the hydrochemical field distribution thedeep groundwater in the sedimentary basins of east China with Pitzer models and massbalance models,as well as mathematical for calculating mineral· salubility ingroundwater. These models make up the defects of those traditional hydrogeochemcialmodels in researching the distribulioions and forms of the chemical components ofgroundwater with medium and high salinity. The saturated degrees of soda (NaHCO_3)and gypsum(CaSO_4.2H_2O),the main indicative minerals in the groundwater,arequantitavely evaluaed.The resuIts are used to sttidy the hydrodynamical fields of deepgroundwater related to the oil migration and cumulation in sedimentary basins,which willprovide effective methods for researching the migration and cumulation condition of oil insedimentarv basins.