滇西南思茅盆地盐构造研究及找钾初探

摘要

滇西南思茅盆地是我国重要的含钾盐盆地,勐野井钾盐矿也是我国目前发现唯一的固体氯化钾盐矿床.本文通过综合分析滇西南成盐成钾的地质背景、古环境和构造演变、含盐(钾)地层的沉积建造特征、矿区勘探剖面的盐构造的形态、重力剖面和EH4测量电性断面,参照2500m、3000m的MK-1和MK-2基准井,推测了研究区的断裂构造、底辟构造,认为勐野井钾盐矿体是沿断裂由深部在挤压构造作用下底辟浅部揉扭流动至浅部地层中,并采用3D建模及可视化技术,建立了岩盐体在地下3D结构.利用“平衡剖面技术”的原理,示意深部岩盐体在拉张和挤压构造作用下,岩盐体沿断层塑流的过程,分析了形成各种底辟构造的动力机制.该研究拓展了滇西南思茅盆地的找盐(钾)思路,为思茅盆地未来找钾和勐野井钾盐矿的后期开发具有参考意义.%The Simao basin is an important potassium salt basin in our country and the Mengyejing potash deposit is the only halide solid potash deposit in China.In this article,we comprehensive analysis of the geological background,the ancient environment,tectonic evolution,the characteristics of sedimentary and potassium salt layers.Using two geophysics methods to explore in studying area,for example:gravity and AMT.By studying the gravity profile map and the resistivity cross-section,and then compared with two drillings,which named MK-1 and MK-2,and their depths are up to 2500m and 3000m.We can infer the fracture structure,diapirs,and then speculated that Mengyejing potash ore body was knead twist flows to shallow along the fracture from deep in extrusion structure.Analyzing two geological exploration profiles from the Mengyejing mineral deposit,researching the distribution characteristics of salt rock and the formation process under the background of tectonic movement,applied 3D nodel and visualization technology,to recover the 3D the salt body.By using the principle of " balanced section technique" to simulate the process of salt extruding along the fault under Spin and extrusion force.Through these research,expand the through of finding potassium sah in Simao basin,and provide better foundation for the next phase work.