蒙古某凹陷水文地质特征与油藏的关系研究

The Relationship between Hydrogeologic Characteristics and Reservoir in a Depression in Mongolia

沉积盆地内地下水是油气运移的重要载体,水文地质特征是控制或影响油气藏的边界条件。采用水动力场与水化学场结合的方法,对蒙古某凹陷主要含水岩系的水文地质条件进行了研究。该凹陷地下水属于低矿化度的NaHCO3型水,水化学组分随着地下水的运动方向呈现有规律的变化。已发现的油田,有明显的水化学异常存在,从已知推未知,预测凹陷的含油气远景,为油气勘探开发提供了水文地球化学依据。

Groundwater is the important carrier of the hydrocarbon migration in sedimentary basins,hydro-geological characteristics can control or influence the boundary of the reservoir.By the combination of hydrodynamic field and hydrochemical field,the hydro-geological conditions of main water—bearing rock series have been researched in a depression in mongolia.The underwater type is NaHCO3 with the low salinity in this depression.The elements change regularly with the direction of movement of the groundwater.The characteristics of water chemistry are obvious abnormal in discovered oilfields.They provide the hydro-geochemical basis for the exploration and development of reservoirs by predicting hydrocarbon potential in the depression.