库车坳陷古近纪石盐岩空间展布及找钾意义？

SPATIAL DISTRIBUTION ON HALITE IN THE KUQA DEPRESSION IN PALEOGENE AND SIGNIFICATION OF POTASH SURVEY

新疆库车坳陷古近纪发育巨厚的蒸发岩沉积,厚度从几十米至上千米不等。主要蒸发岩沉积(特别是石盐岩沉积)发生在古新世-始新世的库姆格列木群沉积期。依据3Dmine矿业工程软件、库车坳陷地形点三维坐标统计数据、部分钻井数据(包括孔位、孔深、孔斜)、石盐岩层在钻井中的沉积厚度及蒸发岩沉积旋回,对坳陷库姆格列木群蒸发岩沉积期石盐岩空间展布进行研究,绘制库车坳陷古新统-始新统石盐岩空间分布模型,探讨盆地找钾意义。通过石盐岩空间模型展布特征分析,石盐岩体与库车坳陷的地形特征和构造特征紧密相关,石盐岩受构造挤压并于与地形的总体起伏基本一致。从石盐岩体空间模型南北向剖面变化规律分析,古新世-始新世,库车坳陷西部出现2个蒸发岩沉积中心,分别位于西盐山口盐场一带和拜城凹陷。为库车次级古盐湖发育区,而钾盐的富集一般产于大的坳陷当中的次级构造单元,为有利的找钾区域。

Evaporites with gigantic thickness had been developed in Kuqa Depression from Paleocene to early Mioce ne, and the sediment thickness changed from tens to thousands of meters, most of the sediment of evaporite （especially the halite） appeared from Paleocene to early Miocene. We can search the spatial distribution model of halite in Kuqa depression and draw its model from Paleocene to Miocene, according to the 3D mine mineral software, statistical data of , China coordinate in Kuqa Depression, partial drilling data （including hole site, hole depth, hole deviation）, the sedimentary thickness of halite layer in the drilling and evaporite sedimentary cycle. It is closely interrelated on salt body, terrain and structure of Kuqa Depression by spatial distribution model of evaporates, and the halite is consistent with topographic relief by tectonic compression. Two deposition centers of evaporates appeared in the west of Kuqa Depression by section cut north to south of spatial distribution model , and they are located in the area of Xi yan ditch and Baicheng sag. They are usually ancient salt lake concentration center, Such as Kuqa Depression which developed deposition centers of evaporates, however, the little tectonic units are good place for potash exploration, and are also the places which potassium enrichment in.