老挝万象盆地萨塔尼钾盐矿的构造变形与深部矿预测  

Structural Deformation and Deep Ore Prediction for Satani Potash Deposit in Vientiane Basin, Laos

作　　者：梁光河[1,2,3] 徐兴旺 刘兴江[4] 李德华 高超 LIANG Guanghe;XU Xingwang;LIU Xingjiang;LI Dehua;GAO Chao(Key Laboratory of Mineral Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Institutions of Earth Sciences,Chinese Academy of Sciences,Beijing 100029,China;University of Chinese Academy of Sciences,Beijing 100029,China;Beijing Puyue Lao Mining Co.,Ltd.,Vientiane,Laos;Nanjing Coal Geological Survey Team of Jiangsu Province,Nanjing 210046,Jiangsu,China;Beijing Tian'an Ruida Petroleum Technology Co.,Ltd.,Beijing 101149,China)

机构地区：[1]中国科学院地质与地球物理研究所矿产资源研究重点实验室,北京100029 [2]中国科学院地球科学研究院,北京100029 [3]中国科学院大学,北京100029 [4]北京普悦老挝矿业有限公司,老挝万象 [5]江苏省南京煤炭地质物测队,江苏南京210046 [6]北京天安瑞达石油科技有限公司,北京101149

出　　处：《大地构造与成矿学》2019年第5期934-942,共9页Geotectonica et Metallogenia

基　　金：第二次青藏高原综合科学考察研究项目(2019QZKK0806);国家重点研究计划“深地资源勘查开采”重点专项项目“北方增生造山成矿系统的深部结构与成矿过程”(2017YFC0601204)联合资助

摘　　要：老挝万象盆地蕴藏有丰富钾盐矿,钾盐成矿后受到了后期构造运动的强烈改造。后期构造运动对万象盆地的钾盐矿产生了怎样的改变?一直缺乏深入研究。本次研究表明,在挤压走滑背景下,后期的构造运动对钾盐进行改造,并使得钾盐矿体发生了塑性柔流和脆性滑移。万象盆地萨塔尼钾盐矿区的三维地震勘探结果表明,无论水平切片还是垂直剖面上,都清晰地显示了构造运动对钾盐矿和地层的后期改造。钻探岩心也显示与构造运动有关的柔流变形。通过钻孔测井资料对三维地震勘探进行标定,可以准确外推钾盐矿体的横向变化并预测定位钾盐矿的空间位置。最终在老挝万象盆地萨塔尼一个很小的矿区详勘发现了一个超大型钾盐矿床,因此三维地震在万象盆地钾盐矿后期改造和勘探方面发挥显著作用。The Vientiane Basin in Laos is rich in potash ores that experienced strongly post-ore reformation. Few studies have been conducted on the impacts of tectonic movement on the potash ore deposits in the Vientiane Basin. Analyses of the tectonic evolution of the Indosinian block and the boundary faults of the Vientiane Basin show that the potash ore bodies experienced plastic flexible flow and brittle slip during the post-ore extrusion and strike-slip. Our 3D seismic exploration in a small area showed that the tectonic movement clearly affected the transformation of potash ores and strata both horizontally and vertically. Soft flow deformation associated with tectonic movement was also found in drilling cores. By calibrating 3D seismic exploration with borehole logging data, the lateral variation of potash ore body can be extrapolated and the position of potash ore can be predicted. Finally, we found a super large potash deposit in a very small working area after detailed exploration. This shows that the 3D seismic exploration is useful in the exploration of potash ore deposits experienced post –ore transformation in the Vientiane Basin.

关 键 词：构造变形 万象盆地 钾盐矿 印支地块 隐伏矿预测 

分 类 号：P612[天文地球—矿床学] P613[天文地球—地质学]