新疆库车坳陷西段古近系高溴岩盐的发现及意义
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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.
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.
引文
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[19]汪新,王招明,谢会文,等.塔里木库车坳陷新生代盐构造解析及其变形模拟[J].中国科学:地球科学,2010.12:1655-1668.
[20]尹宏伟,王哲,汪新,等.库车前陆盆地新生代盐构造特征及形成机制:物理模拟和讨论[J].高校地质学报,2011.17(2):308-317.
[21]郭如新,死海溴镁资源开发利用现状[J].盐湖研究,2005.13(04):61-66.
[22]林耀庭,我国卤水溴资源及其开发前景展望[J].盐湖研究,2000.8(2):59-66.
[23]陈向锋,曹春燕,中国工业溴现状及前景展望[J].化工科技市场,2010.33(07):5-8.
[24]余疆江,郑绵平,伍倩,乜贞,卜令忠,卤水溴资源开发利用进展[J].现代化工,2013.33(04):47-51.
[25]赵桂兰,孙录科,陈时磊,张勇,邢立亭,潍坊市沿海地区卤水资源的开发利用与管理[J].济南大学学报(自然科学版),2012.26(03):311-314.
[2]Mc Caffrey,M.A.,Lazar,B.,Holland,H.D.,The Evaporation Path of Seawater and the Coprecipitation of Br-and K+with Halite[J].1987.
[3]谭红兵,马万栋,马海州,等.塔里木盆地西部古盐矿点卤水水化学特征与找钾研究[J].地球化学,2004.33(2):152-158.
[4]程怀德,马海州,谭红兵,等.钾盐矿床中Br的地球化学特征及研究进展.矿物岩石地球化学通报,2008.27(04):399-408.
[5]Wang,S.L.,Zheng,M.P.,Liu,X.F.,et al.,Distribution of Cambrian Salt-Bearing Basins in China and Its Significance for Halite and Potash Finding.Journal of Earth Science,2013,24(02):212-233.
[6]胡鹏,闫秋实,赖万昌,库车盆地岩盐及卤水地球化学特征及成矿远景分析[J].四川有色金属,2012.4:38-42.
[7]刘群,陈郁华,李银彩,中国中、新生代陆源碎屑-化学盐型盐类沉积[M].北京:科学技术出版社.1987.
[8]曲懿华,试论盐系中泥砾岩成因[J].化工矿产地质,1997.19(3):162-166.
[9]谭红兵,塔里木盆地西部古盐岩地球化学与成钾预测研究[D].中国科学院研究生院(青海盐湖研究所).2005.
[10]马万栋,马海州,谭红兵,等,2003.塔里木盆地西部含盐系地层成盐元素的地球化学初步研究[J].盐湖研究,11(2):35-41.
[11]郑绵平,袁鹤然,张永生,等.中国钾盐区域分布与找钾远景[J].地质学报,2010.84(11):1523-1553.
[12]郑绵平,张震,张永生,等.我国钾盐找矿规律新认识和进展[J].地球学报,2012.33(3):280-294.
[13]郑绵平,侯献华,,于常青,等.成盐理论引领我国找钾取得重要进展[J].地球学报,2015.36(02):129-139.
[14]Deng Xiaolin,Wei Zhao,Zhao Yuhai,et al.,Formation Mechanism of Potash Deposits in the Kuqa Depression and Their Prediction[J].Acta Geologica Sinica(English Edition),88(1):208-210.Journal of Sedimentary Petrology,2014.57:928-937.
[15]邓小林,韦钊,赵玉海,等.塔里木盆地古近纪钾盐矿层的发现及其意义[J].矿物学报,2013.33(S2):755-756.
[16]Wei Zhao,Deng Xiaolin,Zhao Yuhai,et al.,Discovery of Potassium-bearing Cutting from the Well Yangta 4 in the Kuqa Depression and Seam Division[J].Acta Geologica Sinica(English Edition),2014.88(1):265-266.
[17]刘英俊,曹励明,李兆麟,等.元素地球化学[M],科学出版社,北京:1984.490-496.
[18]汤良杰,余一欣,杨文静,等.库车坳陷古隆起与盐构造特征及控油气作用[J].地质学报,2007.81(2):145-150.
[19]汪新,王招明,谢会文,等.塔里木库车坳陷新生代盐构造解析及其变形模拟[J].中国科学:地球科学,2010.12:1655-1668.
[20]尹宏伟,王哲,汪新,等.库车前陆盆地新生代盐构造特征及形成机制:物理模拟和讨论[J].高校地质学报,2011.17(2):308-317.
[21]郭如新,死海溴镁资源开发利用现状[J].盐湖研究,2005.13(04):61-66.
[22]林耀庭,我国卤水溴资源及其开发前景展望[J].盐湖研究,2000.8(2):59-66.
[23]陈向锋,曹春燕,中国工业溴现状及前景展望[J].化工科技市场,2010.33(07):5-8.
[24]余疆江,郑绵平,伍倩,乜贞,卜令忠,卤水溴资源开发利用进展[J].现代化工,2013.33(04):47-51.
[25]赵桂兰,孙录科,陈时磊,张勇,邢立亭,潍坊市沿海地区卤水资源的开发利用与管理[J].济南大学学报(自然科学版),2012.26(03):311-314.