CAJ | 학술논문

位于陕北奥陶纪盐盆东二盐凹东部的钾盐科学勘查井——绥钾1井,揭示了奥陶系马家沟组马五6亚段厚度为118.17 m,其中岩盐厚度累计100.38 m。本次工作将该井马五6亚段划分为4个成盐韵律,并利用示钾微化反应和岩盐样品溴、氯、钾元素分析为主要分析手段对绥钾1井岩盐段的含钾性进行评价,结果表明：该井马五6亚段发育累计厚度达64.7 m的厚层钾石盐高矿化段,发育4套成盐韵律,含钾石盐分布在相对完整的韵律II和韵律III中大部分的褐红色和褐色石盐中,以韵律II含钾性最好,石盐顶部的泥质夹层起到了保护作用；本井整体 K＋含量在0.08%~1.24%之间,一般在0.1%以上,平均为0.23%,局部井段钾含量接近边界工业品位； Br-含量在90×10-6~400×10-6之间,平均为242×10-6； Br-×103/Cl-(溴氯系数)在0.17~0.98之间,平均为0.45。溴值和溴氯系数绝大部分达到钾石盐-光卤石沉积阶段。利用绥钾1井和盐盆内其他地区9口盐探井的平均钾含量数据编制了陕北奥陶纪盐盆马五6亚段 K+含量(%)变化趋势图,该图指示东南部的东二盐凹是研究区较有利的含钾盐凹。绥钾1井马五6亚段厚层钾石盐高矿化段的发现,不仅揭示了该盐盆巨大的找钾前景,也为今后钾盐勘查工作部署指明了方向。
위우협북오도기염분동이염요동부적갑염과학감사정——수갑1정,게시료오도계마가구조마오6아단후도위118.17 m,기중암염후도루계100.38 m。본차공작장해정마오6아단화분위4개성염운률,병이용시갑미화반응화암염양품추、록、갑원소분석위주요분석수단대수갑1정암염단적함갑성진행평개,결과표명：해정마오6아단발육루계후도체64.7 m적후층갑석염고광화단,발육4투성염운률,함갑석염분포재상대완정적운률II화운률III중대부분적갈홍색화갈색석염중,이운률II함갑성최호,석염정부적니질협층기도료보호작용；본정정체 K＋함량재0.08%~1.24%지간,일반재0.1%이상,평균위0.23%,국부정단갑함량접근변계공업품위； Br-함량재90×10-6~400×10-6지간,평균위242×10-6； Br-×103/Cl-(추록계수)재0.17~0.98지간,평균위0.45。추치화추록계수절대부분체도갑석염-광서석침적계단。이용수갑1정화염분내기타지구9구염탐정적평균갑함량수거편제료협북오도기염분마오6아단 K+함량(%)변화추세도,해도지시동남부적동이염요시연구구교유리적함갑염요。수갑1정마오6아단후층갑석염고광화단적발현,불부게시료해염분거대적조갑전경,야위금후갑염감사공작부서지명료방향。
Located on the east side of the Suide salt depression in Northern Shaanxi salt basin, the scientific potash prospecting well of SJ1 encountered 118.17 m of theM56 member of the Ordovician Majiagou Formation. The cumulative thickness of the salt series in the member is 100.38 m. In this study, theM56 member of well SJ1 was divided into 4 salt rhythms, and the potassium content in the salinastone section was evaluated by in-situ micro-chemical reaction testing and quantitative analysis in the laboratory. The data obtained indicate that the cumulative thickness of mineralized potash in theM56 member is 64.7 m, comprising 3 salt rhythms. Potash salt monolayer is brownish red or brown in color in the relatively complete rhythm II and rhythm III, and potash salt in rhythm II has the highest content of potassium, with the argillaceous interlayer at the top playing the protective role. The potassium content for part of the section is close to industrial grade, with potassium ion content ranging from 0.08% to 1.24%, mostly in excess of 0.1% and averagely 0.23%. The Br- content is from 90×10-6 to 400×10-6, averaging 242×10-6; the Br-×103/Cl- ratio ranges from 0.17 to 0.98, averaging 0.45. The content of Br- and the Br-×103/Cl- ratio indicate that most of the samples have reached the precipitation stage for potash and carnallite. Using the average K+ (%) content values for well SJ1 and the other eight boreholes in the salt depression, the authors drew a trend map for the change in the K+ (%) content, which shows that the better potash depression is the second east salt depression. The discovery of the thick highly mineralized sylvite layer in the well not only supports the potential for potash prospecting in the area but also provides clear indications for the exploration of potash salt.