柴达木盆地别勒滩地区深部卤水储层空间分布特征研究

我国柴达木盆地蕴藏着丰富且极具开发潜力的卤水钾锂资源，但随着产能的不断扩大和持续开发，浅部易开采的优质资源不断减少，走向深部开采成为必然选择。与浅部相比，盐湖深部卤水储层质量相对较差，富水性弱且不稳定，开采难度极大。本文以查明察尔汗盐湖别勒滩区段深部卤水储层特征为目的，通过分析钻孔岩性和物性数据，研究了别勒滩区段深部卤水储层的平面分布特征和厚度变化规律，结果表明研究区以东南部储层厚度最大且石盐岩储层质量最优。卤水储层三维建模研究显示，富锂卤水主要分布在研究区中北部，南部锂含量相对较低；平面上第Ⅱ含矿层在中部石盐厚度大且粉砂和黏土夹层少，有利于卤水的开采。

Spatial distribution characteristics of deep brine reservoir in Beletan area, Qaidam Basin

Qaidam Basin contains abundant and highly prospective brine potassium-lithium resources. However, with the continuous expansion of production capacity and ongoing development, the easily accessible high-quality resources in the shallow part are decreasing, so it is inevitable to go deep mining. Compared to the shallow section, the brine reservoir in the deep part of the salt lake is relatively poor in quality, with weaker and more unstable water enrichment, so it is very difficult to exploit. In order to find out the characteristics of deep brine reservoir in Beletan section of Qarhan Salt Lake, the planar distribution and thickness variation of deep brine reservoir in Beletan section were studied by analyzing the lithology and physical property data of borehole. The results show that the southeastern part of the study area has the thickest reservoir and the highest quality of rock salt reservoir. Three-dimensional modeling of the brine reservoir shows that lithium-rich brine is mainly distributed in the middle and northern part of the study area, and the lithium content in the southern part is relatively low. The second ore-bearing layer on the plane has a large thickness of rock salt and fewer interbedded silt and clay layers in the central part, which is beneficial to the extraction of brine.