吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (1): 61-73.doi: 10.13278/j.cnki.jjuese.201701106

• 地质与资源 • 上一篇    下一篇

麦盖提斜坡奥陶系碳酸盐岩碳氧同位素特征及其意义

牛君1, 黄文辉2, 丁文龙2, 蒋文龙3, 张亚美2, 漆立新4, 云露4, 吕海涛4   

  1. 1. 中国石油大学(北京)克拉玛依校区石油学院, 新疆 克拉玛依 834000;
    2. 中国地质大学(北京)能源学院, 北京 100083;
    3. 中国石油新疆油田公司博士后工作站, 新疆 克拉玛依 834000;
    4. 中国石化西北油田分公司勘探开发研究院, 乌鲁木齐 830011
  • 收稿日期:2016-01-12 出版日期:2017-01-26 发布日期:2017-01-26
  • 通讯作者: 黄文辉(1961),男,教授,主要从事沉积地球化学研究,E-mail:huangwh@cugb.edu.cn E-mail:huangwh@cugb.edu.cn
  • 作者简介:牛君(1986),女,博士研究生,主要从事沉积学方面研究,E-mail:niujunmm@126.com
  • 基金资助:
    国家油气重大专项（2011ZX05009-002-203）；中国石化西北油田分公司勘探开发研究院协作项目（KY2011-S-070）

Carbon and Oxygen Isotope Characteristics and Its Significance of Ordovician Carbonates in Yubei Area of Maigaiti Slope

Niu Jun1, Huang Wenhui2, Ding Wenlong2, Jiang Wenlong3, Zhang Yamei2, Qi Lixin4, Yun Lu4, Lü Haitao4   

  1. 1. Faculty of Petroleum, China University of Petroleum-Beijing, Karamay Campus, Karamay 834000, Xinjiang, China;
    2. School of Energy Resource, China University of Geosciences(Beijing), Beijing 100083, China;
    3. Post-Doctoral Research Center, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
    4. Exploration and Development Research Institute, Northwest Oilfield Company, Sinopec, Urumqi 830011, China
  • Received:2016-01-12 Online:2017-01-26 Published:2017-01-26
  • Supported by:
    Supported byMajor National Oil and Gas Projects (2011ZX05009-002-203) and Exploration and Development Research Institute, Sinopec Northwest Oilfield Branch Company (KY2011-S-070)

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摘要： 依据实测的塔里木盆地麦盖提斜坡玉北地区41个碳酸盐岩碳氧同位素数据,结合岩石学方法,研究了碳氧同位素的组成、演化及其地质意义。数据显示,δ13C值主要分布在-2.6‰~0.7‰,均值为-1.0‰；δ18O值分布在-9.4‰~-3.5‰,均值为-6.9‰。玉北地区古盐度为118.39~126.34,平均为121.94。奥陶系碳酸盐岩淡水改造作用明显。碳氧同位素的组成和演化不但可以指示沉积环境,而且还与生物生产率以及古海平面变化呈正相关性：δ13C的低值对应于局限台地台内滩亚相沉积环境；δ13C的高值对应于开阔台地滩间海、台内滩亚相沉积环境。碳氧同位素组成还对成岩环境有明显响应：鹰山组δ13C与δ18O均向高负值偏移,表明经历过强烈的表生岩溶作用；蓬莱坝组δ13C低-中负值,δ18O表现为高负值,在白云岩储层中可见鞍状白云石及燧石,主要为深埋藏成岩环境；良里塔格组同位素特征为δ18O高负值,δ13C低正值,并且在进入埋藏岩溶阶段之前还经历过风化壳岩溶作用。

关键词: 碳氧同位素, 沉积环境, 碳酸盐岩, 奥陶系, 麦盖提斜坡, 塔里木盆地

Abstract: Based on 41 analyzed results of carbon and oxygen isotope, we have discussed the compositions, evolution and geological significance of δ18O and δ13C recorded in the carbonates of Ordovician in Yubei area of Tarim basin, using petrologic method. The result shows that δ13C values range from -2.6‰ to 0.7‰, with average value of -1.0‰; and δ18O values range from -9.4‰ to -3.5‰, with average value of -6.9‰. The values of paleosalinity range from 118.39 to 126.34, with average value of 121.94. The transformation of freshwater in Early Ordovician is strong. The isotopic composition and evolution not only indicate the sedimentary environment, but also show positive correlation with bioproductivity and palaeo-sea level changes:low value of δ13C corresponding to platform shoal of restricted platform environment, high value of δ13C corresponds to interbank sea and platform shoal of open marine platform. Different carbon and oxygen isotopes composition also indicates different diagenetic environments. The δ13C and δ18O value of Yingshan Formation are high negative, which suggest that carbonates experienced strong epigenic karstification. The values of δ13C are low to medium negative and δ18O are high negative in Penglaiba Formation, and saddle dolomite and flint occur in the dolomitite reservoir, indicating that carbonate experienced buried diagenetic environment. The δ13C values in Lianglitage Formation are low positive and δ18O are high negative, which suggest that carbonate experienced buried diagenetic environment.

Key words: carbon and oxygen isotope, depositional environment, carbonates, Ordovician, Maigaiti slope, Tarim basin

中图分类号: 

  • P597
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