潜江凹陷潜江组深层卤水矿产特征与资源评价

利用潜江凹陷大量井筒及试水资料,研究古盐湖深层卤水赋存方式及成矿规律,开展卤水资源评价,为深层卤水开发利用提供建议。研究表明潜江凹陷潜江组卤水赋存于砂岩孔隙中,纵向上划分为5个卤水组,平面上受砂岩物源影响由北向南矿体厚度逐渐变薄直至尖灭;卤水总矿化度垂向分带平面分异明显,垂向上随着深度增加而增加,平面上凹陷中心矿化度高,向四周逐渐降低;卤水中的钾、锂、硼、溴、碘、铷、铯等元素含量与总矿化度呈正比,平面上与总矿化度规律一致,均呈环带状分布。通过对该区资源量进行测算和评价,得出潜江凹陷潜江组砂岩卤水为中孔、中渗、中产能、中深层、氯化钠型,含锂、溴、硼、钾大型工业卤水矿床;由此提出利用油田钻井和油田伴生卤水采卤并进行综合利用,提取食盐、碘、溴、氨水、氯化钾、硼砂、碳酸锂、氯化铷、氯化铯等产品,具有良好的开发前景。

Mineral Characteristics and Resources Assessment of the Deep Brine in Qianjiang Formation,Jianghan Depression

:Based on a great quantity of borehole and water production data of Qianjiang depression, the occurrence and accumulation of deep brine in the palaeo-salt lake were studied, the brine resource extent was evaluated, and proposals on the development and utilization of deep brine were put forward. The results indicate that the brine of Qianjiang formation, Qianjiang depression exists in the pores of sandstone, is divided into 5 brine beds vertically, and gradually thins from north to south and pinchs out at last laterally due to the effect of sandstone provenance. The total salinity is compartmented vertically in zones and differentiated in layers. More specifically, the salinity increases with the depth vertically and decreases gradually from the center of depression to the periphery laterally. The element contents of potassium, lithium, bromine, rubidium and cesium are proportional to the total salinity, and distributed consistently to the salinity in the shape of annular zones. The estimation and comprehensive evaluation of the brine resource extent show that the brine in the sandstone of Qianjiang formation, Qianjiang depression is a large scale, sodium chloride-type, lithium, bromine, boron, and potassium brine-deposit with moderate porosity and permeability, moderate productivity, and medium-deep burial depth. Based on the evaluation, it is proposed that the recovery and comprehensive utilization of brine by drilling or by use of associated brine water to extract such products as table salt, iodium, bromium, ammonia water, potassium chloride, sodium borate, lithium carbonate, rubidium chloride, and cesium chloride, etc. will produce a good economic benefit.