摘要
在对库车坳陷油气钻井进行岩屑观察编录及采样工作过程中,在库车坳陷西段北部KS208井深部发现有古近系古-始新统库姆格列木群(E1-2km)高溴岩盐岩屑。岩盐岩屑表面光洁干净,透明-半透明,可见解理特征;内部可见沿生长环带发育的原生包裹体及呈面状或串珠状分布的次生包裹体,偶见暗色-棕色烃类包裹体;原生包裹体均一温度介于37~75℃之间,保留有一定的古温度信息,次生包裹体均一温度介于87~129.2℃之间,体现的不同深埋条件下岩盐所处的地温条件。以上特征表明盐岩岩屑保留有岩盐沉积-演化的信息,为原生岩屑。通过对岩屑进行基本化学分析及X(射线)衍射分析,基本确定KS208井高溴层位的溴主要赋存在盐岩中,并以类质同象的形式替代了岩盐中NaCl中的Cl。KS208井古近系高溴岩盐的发现意义重大,指示了库车坳陷在古近纪盐类沉积阶段可能存在卤水的南北迁移,导致钾、溴的分异;或是岩盐在重结晶过程中发生了溴的析出与局部富集。此外,高溴岩盐的研究对于开拓我国急缺的溴资源新类型(固体溴)有重要价值。
During the drilling cuttings logging process of oil and gas boreholes in the Kuqa depression,in western sector north part well KS208 deep part has intersected Paleogene Paleocene-Eocene series Kumglem Group（ E1-2 km） and discovered high bromine cuttings. On the rock salt cuttings,bright and clean surfaces; transparent to translucent,cleavage features can be seen. Inner part can see protogenetic inclusions and area or moniliform distributed secondary inclusions developed along the growth annulus,occasionally dark-brown hydrocarbon inclusions. Protogenetic inclusion homogenization temperature is 37 ~ 75℃,had reserved certain paleotemperature information; secondary inclusion homogenization temperature is 87 ~ 129. 2℃,reflected rock salt situated geothermal condition under different buried depths. Above features have shown the rock salt cuttings reserved rock salt sedimentation-evolution information,thus the protogenetic cuttings. Through basic chemical analysis and X-ray diffraction analysis for cuttings,have basically determined well KS208 bromine in high bromine horizon is mainly hosted in rock salt,in isomorphic form substituted chloride（ Cl） in rock salt（ Na Cl）. Thus the discovery of Paleogene high bromine rock salt in well KS208 has great significance. It indicated that during the Paleogene salts sedimentation stage in Kuqa depression may have the south to north migration of brine,resulting in differentiation of potassium and bromine; or during the recrystallization process of rock salt happened bromine precipitation and locally enriched. Besides,the study on high bromine rock salt is of significant value to exploit urgent need new bromine resource（ solid bromine） in China.
作者
王凡
王永明
李晓亚
刘炎东
李波
韦钊
王健
刘星旺
王占文
Wang Fan;Wang Yongming;Li Xiaoya;Liu Yandong;Li Bo;Wei Zhao;Wang Jian;Liu Xingwang;Wang Zhanwen(Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037;Geological Research Institute,China Chemical Geology and Mine Bureau,Zhuozhou,Hebei 072750)
出处
《中国煤炭地质》
2018年第6期75-81,共7页
Coal Geology of China
基金
中国地质调查局西部地区钾盐矿产远景调查评价项目(NO.121201103000150011)
