天然气地球化学

塔里木盆地中下奥陶统碳酸盐岩地球化学特征及其对成岩环境的指示——以巴楚大板塔格剖面和阿克苏蓬莱坝剖面为例

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  • 1.中国地质大学(北京)能源学院, 北京 100083;
    2.中国地质大学(北京)海相储层演化与油气富集机理教育部重点实验室, 北京 100083
杜洋(1990-),男,辽宁盘锦人,博士研究生,主要从事碳酸盐岩沉积储层研究. E-mail:duyang9012@163.com.

收稿日期: 2015-11-25

  修回日期: 2016-01-17

  网络出版日期: 2019-09-12

基金资助

国家自然科学基金(编号:41102087);国家重点基础研究发展规划(“973”)项目(编号:2012CB214802)联合资助.

Geochemical characteristics and their implications to diagenetic environment of Lower-Middle Ordovician carbonate rocks,Tarim Basin,China:A case study of Bachu Dabantage outcrop and Aksu Penglaiba outcrop

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  • 1.School of Energy Resources,China University of Geosciences,Beijing 100083,China;
    2.Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism,
    Ministry of Education,China University of Geosciences,Beijing 100083,China

Received date: 2015-11-25

  Revised date: 2016-01-17

  Online published: 2019-09-12

摘要

利用薄片、碳氧稳定同位素、微量元素等测试资料,以巴楚大板塔格与阿克苏蓬莱坝剖面中下奥陶统碳酸盐岩为研究对象,系统报道了岩石学与地球化学的各种特征,分析了不同特征所表征的成岩环境。研究表明:(1)碳、氧同位素垂向上整体表现为埋藏成岩环境,鹰山组顶部、蓬莱坝组中部以及顶部呈现出淡水成岩环境特征,鹰山组中部与蓬莱坝组底部显示为海水成岩环境,鹰山组下部和上部表现为海水成岩环境背景下短期受到淡水影响,白云岩δ18O值、δ13C值高于灰岩,鹰山组白云岩δ13C值低于蓬莱坝组白云岩;(2)不同类型白云岩Sr含量呈现规律性。还原环境敏感元素富集在鹰山组中—粗晶白云岩与蓬莱坝组顶部粉—细晶白云岩,氧化环境敏感元素富集在鹰山组藻砂屑云质灰岩、蓬莱坝组细晶夹自形中晶白云岩和砂屑幻影白云岩;(3)白云岩化的过程是LREE亏损的过程。一间房组生屑灰岩具较高的∑REE,MREE略富集,Ce负异常程度高,蓬莱坝组下部残余结构云岩REE配分继承颗粒灰岩。鹰山组下部藻泥晶砂屑灰岩与云质砂屑灰岩REE配分相似,∑REE具有随水体深度增加而减小的趋势,LREE富集,HREE亏损,Gd正异常。鹰山组中—粗晶白云岩与蓬莱坝组顶部粉_细晶白云岩REE配分相似,MREE富集。鹰山组与蓬莱坝组细晶—中晶白云岩具明显Eu负异常。

本文引用格式

杜洋, 樊太亮, 高志前 . 塔里木盆地中下奥陶统碳酸盐岩地球化学特征及其对成岩环境的指示——以巴楚大板塔格剖面和阿克苏蓬莱坝剖面为例[J]. 天然气地球科学, 2016 , 27(8) : 1509 -1523 . DOI: 10.11764/j.issn.1672-1926.2016.08.1509

Abstract

Based on the analytical data of thin section,carbon and oxygen stable isotopes and trace elements,this study reported various characteristics of petrology and geochemistry and the analysis of the different features to characterize the diagenetic environment,taking Lower-Middle Ordovician carbonate rocks of Bachu Dabantage outcrop and Aksu Penglaiba outcrop as objects.Research shows:(1)Overall,carbon and oxygen isotopes perform as the burial diagenetic environment vertically.Meteoric diagenetic environment was shown at the top of Yingshan Formation,the top and the middle part of Penglaiba Formation.Marine diagenetic environment was shown at the middle of Yingshan Formation and the bottom of Penglaiba Formation.Mixed diagenetic environment occurred at the upper and lower parts of Yingshan Formation.δ18O and δ13C values are higher in dolomite than that in limestone.δ13C value in dolomite is higher of Yingshan Formation than that of Penglaiba Formation.(2)Sr content in various dolomites shows regularity.Reductive environment sensitive element concentrate in the medium-coarse grain dolomite and powder-fine grain dolomite.Oxidation environment sensitive elements enrich in algal calcarenite,fine crystal-the microtek dolomite and the phantom dolomite.(3)The process of dolomization is LREE loss process.Raw crumbs limestone shows high ∑REE,MREE enrichment and its Ce negative anomaly degree is high.REE partition of phantom dolomite inherits that of granular limestone.REE partition of algal micritic calcarenite and algal dolomitic calcarenite are the same,with enrichment of LREE,HREE loss and Gd positive anomaly.Their ∑REE increases with the decreace of water depth.REE partition of medium-coarse grain dolomite and powder-fine grain dolomite are the same,with enrichment of MREE.Fine-microtek dolomite has Eu negative anomaly.

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