Geochemical features and environmental significances of deposits in Ordovician karstic fractures and caves, Lunnan area, Tarim Basin
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摘要: 通过对塔里木盆地轮南地区奥陶系风化壳缝洞充填物的观察与分析,识别出3类不同的充填物:流水机械充填物、化学淀积物及重力垮塌堆积物。对其与基岩化学组分、微量元素对比研究,表明不同充填物形成时流体性质和古水文环境不同,其元素的迁移、富集和分馏效应也不同。因此可以利用充填物化学组分和微量元素的迁移、富集特征,来判别轮南地区古风化壳缝洞充填过程中流体性质和古水文环境。经分析,发现3类充填环境:渗流—活跃潜流带的氧化性活跃淡水环境、静滞潜流淡水环境及浅埋藏压释水热水环境,为古岩溶储层预测和评价提供依据。Abstract: In the Ordovician karstic fractures and caves in Lunnan area of the Tarim Basin,three types of depo-sits have been identified including water mechanical fillings,chemical deposits and gravity collapse debris.The comparisons of chemical and trace element compositions between deposits and bedrocks have indicated that when different deposits were formed,fluid properties and hydrological environment were different,and the migration,enrichment and fractionation of elements were also different.As a result,the chemical and trace element compositions can be used to judge the fluid properties and hydrological environment when the Ordovician karstic fractures and caves were filled.Three kinds of filling environment have been found including oxidizing active freshwater environment in seepage-active undercurrent zone,freshwater environment in stagnant undercurrent zone as well as pressure-released and hot water environment in shallow-buried zone.The study is helpful for karstic re-servoir prediction and evaluation.
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Key words:
- paleokarst /
- chemical deposit /
- trace element /
- cluster analysis /
- undercurrent zone
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[1] 郭建华.塔里木盆地古岩溶发育特征[J].中国岩溶,1993,12(2):60. [2] 顾乔元,韩剑发,张耀堂.轮南地区奥陶系断裂及储集层裂缝分形特征[J].新疆石油地质,1998,19(4):287-290. [3] 杨宁,吕修祥,陈梅涛.塔里木盆地轮南、塔河油田碳酸盐岩储层特征研究:以沙107井和轮古40井为例[J].石油实验地质,2008,30(3):247-251. [4] 夏日元,唐建生,邹胜章,等.塔里木盆地北缘古岩溶充填物包裹体特征[J].中国岩溶,2006,25(3):246-249. [5] 陈利新,潘文庆,梁彬,等.轮南奥陶系潜山表层岩溶储层的分布特征[J].中国岩溶,2011,30(3):327-332. [6] 范小林,邱蕴玉,鲍新毅.塔里木盆地轮南—阿克库勒地区地质结构及油气成藏与勘探目标关系[J].石油实验地质,1999,21(2):132-136. [7] 龚福华,刘小平.塔里木盆地轮古西地区断裂对奥陶系古岩溶的控制作用[J].中国岩溶,2003,22(4):313-317. [8] 杨栓荣,潘文庆,韩剑发,等.轮南奥陶系碳酸盐岩储集体控油机理探讨[J].天然气地球科学,2006,17(1):84-88. [9] 张美良,冉景丞.贵州荔波岩溶洞穴发育特征[J].中国岩溶,2000,19(1):13-20. [10] 肖玉茹,何峰煜.古洞穴型碳酸盐岩储层特征研究:以塔河油田奥陶系古洞穴为例[J].石油与天然气地质,2003,24(1):75-80. [11] 徐微,蔡忠贤,贾振远,等.塔河油田奥陶系碳酸盐岩油藏溶洞充填物特征[J].现代地质,2010,24(2):287-293. [12] 王恕一,陈强路,马红强.塔里木盆地塔河油田下奥陶统碳酸盐岩的深埋溶蚀作用及其对储集体的影响[J].石油实验地质,2003,25(增刊):557-561. [13] 成艾颖,余俊清,张丽莎,等.托素湖岩心XRF元素扫描分析及多元统计方法的应用[J].盐湖研究,2011,19(1):20-25. [14] 郑荣才,陈洪德.川东黄龙组古岩溶储层微量和稀土元素地球化学特征[J].成都理工学院学报,1997,24(1):1-7. [15] 成都地质学院沉积研究所.微量元素在沉积学研究中的应用(1)[J].岩相古地理,1988(3/4):108-116. [16] 成都地质学院沉积研究所.微量元素在沉积学研究中的应用(2)[J].岩相古地理,1988(5):51-58. [17] 黄思静.碳酸盐岩的成岩作用[M].北京:地质出版社,2010.(编辑 韩 彧) -
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