深部水文地球化学垂直分带的倒转

REVERSAL OF VERTICAL ZONING IN DEEP HYDROGEOCHEMISTRY

近期石油勘探揭示出含油气地层中,其油田水的水文地球化学垂直分带发生倒转现象。主要表现为矿化度随深度增加降低,水化学类型为富钠贫钙的Na-HCO_3型水,Ca_(2+)与HCO_3呈明显的负相关性。这些特征在靠近油气聚集区表现更明显。因此,对其深入研究将 为油气勘探提供有利信息。

Recent petroleum exploration has revealed that the vertical zoning in the hydrogen chemistry of oil field water in petroleum bearing formations may appear reversed. The main manifestations are that the degree of mineralization reduces when the depth increas es, the type of hydrochemistry is a Na HCO4 type water with rich sodium ions and poor calcium ions,and there is clearly a negatyve correlation between the contents of Ca2- and HCO3 ions. These characteristics are more obviously near petroleum gathering areas. So a thorough study on them will provide beneficial information for petroleum exploration.