天然气地球科学

• 天然气地球化学 • 上一篇    下一篇

四川盆地东部寒武系龙王庙组地球化学特征及其古环境意义

孟昊1,2,任影1,2,钟大康1,2,高崇龙1,2,高宙1,2,王点1,2,姜杨锦丰1,2,李谨杰3   

  1. 1.中国石油大学(北京)地球科学学院,北京 102249;
    2.中国石油大学(北京)油气资源与探测国家重点实验室,北京 102249;
    3.中国石油大庆钻探工程公司测井公司,黑龙江 大庆 163412
  • 收稿日期:2015-10-09 修回日期:2016-04-23 出版日期:2016-07-10 发布日期:2016-07-10
  • 通讯作者: 钟大康(1961-),男,四川资中人,教授,博士,主要从事沉积学及储层地质学研究. E-mail:zhongdakong@263.net.
  • 作者简介:孟昊(1985-),男,山东东营人,博士研究生,主要从事沉积学及储层地质学研究. E-mail:pare3000@hotmoail.com.
  • 基金资助:
    国家自然科学基金项目(编号:41472094;4302108)资助.

Geochemical characteristic and its paleoenvironmental implication of Cambrian Longwangmiao Formaiton in eastern Sichuan Basin,China

Meng Hao1,2,Ren Ying1,2,Zhong Da-kang1,2,Gao Chong-long1,2,Gao Zhou1,2,Wang Dian1,2,Jiang Yang-jin-feng1,2,Li Jin-jie3   

  1. 1.College of Geosciences,China University of Petroleum (Beijing),Beijing 102249,China;
    2.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum (Beijing),Beijing 102249,China;
    3.Well Logging Company,Daqing Oil Drilling Engineering Company,Daqing 163412,China
  • Received:2015-10-09 Revised:2016-04-23 Online:2016-07-10 Published:2016-07-10

摘要: 在野外露头和镜下薄片研究的基础上,对四川盆地东部龙王庙组碳酸盐岩样品的主、微量元素和碳、氧同位素的组分含量、比值特征等地球化学指标进行系统分析,结果表明:龙王庙组19个碳酸盐岩样品的CaO含量高,集中在47.6%~68.3%之间,平均为59.09%;MgO含量变化大,分布在0.65%~12.8%之间,平均为6.17%;Na2O 含量高,集中在0.89%~3.14%之间,平均为1.15%;K2O含量较高,分布在0.03%~2.06%之间,平均为0.43%;相较于同期海水,δ13C值明显偏正,分布在-1.533‰~0.908‰之间,δ18O值明显偏负,分布在-4.957‰~-9.916‰之间,且两者不具相关性。进一步分析MgO/CaO、Sr/Ba、1 000×(Sr/Ca)、V/(V+Ni)等特征元素的比值及古盐度“Z”值、古温度“t”,发现龙王庙组为干热气候、贫氧_缺氧环境下形成的亚热带陆棚(离岸一定距离)沉积;沉积过程中,古气候、古水深、古盐度等表征参数均呈多段式变化,沉积晚期大气淡水作用显著,中期气候最为干热、水深最低、盐度最高,是四川盆地东部白云岩油气储集层最有利的发育时期。

关键词: 四川盆地, 寒武系, 龙王庙组, 地球化学, 沉积环境

Abstract: In order to reveal the paleoenvironment of Early Cambrian in eastern Sichuan Basin,we conducted the analyses on petrography,major elements and trace elements,carbon and oxygen isotope composition in carbonate rock samples from four outcrops of Lower Cambrian Longwangmiao Formation.Our data show high CaO concentrations,great variation in MgO concentrations,low rations of MgO/CaO,high Na and K concentrations,low ratios of Sr/Ba and V/(V+Ni),high ratios of 1 000×(Sr/Ca),high δ13C values,low δ18O values and the absence of correlation between δ13C and δ18O values in Longwangmiao Formation.From the bottom to the top of Longwangmiao Formation,1 000×(Sr/Ca) and V/(V+Ni) values decrease on the whole,while rations of MgO/CaO increase systematically and rations of Sr/Ba have lower values in the middle.These evidences indicte a xerothermic continental shelf (offshore) environment under dysaerobic -anaerobic condition in the subtropical zone,with an influx of meteoric fresh water at the later period of Longwangmiao Formation.Therefore,we surmised that the middle sedimentation stage of Longwangmiao Formation has the most xerothermic climate,highest salinity water and most shallow water,which is most favorable for the development of dolomite.

Key words: Sichuan Basin, Cambrian, Longwangmiao Formation, Geochemistry, Paleoenvironment

中图分类号: 

  • TE122.1+13

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