海拉尔盆地地层水特征及成因分析  

Analysis on features and origin of stratum water in Hailar Basin

作　　者：霍秋立[1] 申家年[1] 付丽[2] 汪振英[2] 刘剑营[3] 

机构地区：[1]大庆石油学院,黑龙江大庆163318 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [3]吉林大学地球科学学院,吉林长春130061

出　　处：《世界地质》2006年第2期172-176,共5页World Geology

摘　　要：海拉尔盆地地层水矿化度平均为8 600 mg/L,具有微咸水的特点;南屯组和大磨拐河组地层水的矿化度较其他层位高,水型为NaHCO3型。地层水中含有一定量的Br、I和B 3种特征微量元素,且各离子总体上表现出从含油中心部位向四周递减的特点。Na++K+和HCO3-与总矿化度之间具有非常好的正相关关系,Na++K+和HCO3-控制了地层水的矿化度。较高的HCO3-含量是由于深部无机成因CO2上侵,与地层水发生化学反应形成,高浓度的Na+与钠长石的溶解有关。地层水氢、氧同位素分析表明:δ18O为-12.07×10-3^-16.76×10-3(SMOW),δD为-96.45×10-3^-132.44×10-3(SMOW),反映出地层水主要为大气淡水,并可能存在弱的蒸发作用。较高的矿化度反映出储层封闭性较好,水动力较弱,有利于油气藏的保存。The average value of salinity of stratum water in Hailar Basin is 8 600 mg/L and characterized by brackish water. The salinity values of stratum water with NaHCO3-type, in Nantun Formation and Damoguaihe Formation are higher than those of other formations. There are three microelements （Br, I and B） in the stratum water, and each ion decreases from the oil-bearing center to the around. Na^＋ ＋ K^＋ and HCO3^-- controlling the salinity of the stratum water are of better correlation with the total salinity. The higher HCO3 in the basin is considered to be the chemical reaction of stratum water with the inorganic origin CO2 from deep horizons. The high concentration of Na^＋ is due to the solution of albite. The analyses of hydrogen and oxygen isotope indicate that the stratum water is mainly atmospheric fresh water, and probably has feeble evaporation. The higher salinity reflects the reservoir having good closeness and feeble hydrodynamic force, which is propitious to the preservation of the reservoir.

关 键 词：海拉尔盆地 地层水 成因 矿化度 

分 类 号：P641.4[天文地球—地质矿产勘探]