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天然气地球科学

• 天然气地质学 • 上一篇    下一篇

柴北缘九龙山地区侏罗系砂岩中碳酸盐胶结物特征及意义

孙国强,王海峰，邹开真，王文卓，周刚，马进业，陈章群   

  1. 1.甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室,甘肃 兰州 730000；2.中国石油青海油田公司勘探开发研究院，甘肃 敦煌 736202；
    3.中国石油测井青海事业部地质评价中心，甘肃 敦煌736202；
  • 收稿日期:2013-10-27 修回日期:2013-12-17 出版日期:2014-09-10 发布日期:2014-09-10
  • 作者简介:孙国强(1977-)，男，河南洛阳人，副研究员，博士，主要从事含油气盆地石油地质学及沉积构造研究. E-mail:sguoqiang@lzb.ac.cn.
  • 基金资助:
    中国科学院2012年度“西部之光”人才计划支持项目；甘肃省自然科学基金项目(编号:1308RJZA310)；甘肃省重点实验室专项（编号：1309RTSA041）联合资助.
     

Characteristics and Significance of Carbon and Oxygen Isotopic Compositionsof Carbonate Cements in Jiulongshan Region,North Edge of Qaidam Basin

SUN Guo-qiang,WANG Hai-feng，ZOU Kai-zhen，WANG Wen-zhuo，ZHOU Gang，MA Jin-ye，CHEN Zhang-qun   


  1. (1.Key Laboratory of Petroleum Resources,Gansu Province/Key Laboratory of Petroleum Resources Research,
    Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China;
    2.Exploratory Development Institute of Qinghai Petroleum Administration,Dunhuang 736202,China；
    3.Qinghai Division,China Petroleum Logging Co.Ltd.,Dunhuang 736202,China)
  • Received:2013-10-27 Revised:2013-12-17 Online:2014-09-10 Published:2014-09-10

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摘要：

综合运用岩石学、矿物学和地球化学等方法，对柴达木盆地北缘中段九龙山地区侏罗系砂岩中碳酸盐胶结物的成岩温度、形成环境和物质来源等进行了系统研究。结果表明，九龙山地区侏罗系砂岩中存在4种自生的碳酸盐胶结物类型:方解石、含铁方解石、白云石和铁白云石。测定其碳同位素(δ13C)值分布范围在-15.1‰～-1.3‰之间，平均值为-6.01‰；氧同位素(δ18O)值分布范围在-17.8‰～-11.2‰之间，平均值为-15.06‰，推算古盐度(Z)值分布范围为87.71～117.77，平均值为107.5。说明九龙山地区侏罗系砂岩在成岩阶段早期有少量有机碳的加入，且成岩流体主要是来自碎屑析水和大气中的淋滤淡水。碳酸盐胶结物的形成温度在78.5～126.55℃之间，平均值为105.86℃。根据成岩特征及形成温度说明侏罗系砂岩的埋藏深度应该大于2 500m，结合目前侏罗系的埋藏深度在1 600m左右，说明九龙山地区侏罗系砂岩在成岩过程中早期被深埋藏后，又经历了后期构造运动的强烈改造，被抬升1 000m左右。

关键词: 碳酸盐胶结物, 同位素, 侏罗系砂岩, 九龙山地区

Abstract:

Based on the analyses of petrology,mineralogy and geochemistry,the depositional environment and origin of carbonate cements of Jurassic sandstones in Jiulongshan Region on the northern margin of the Qaidam Basin are studied.The experimental results demonstrate that there were four kinds of autogenic carbonate cements: calcite,iron-bearing calcite,dolomite and ankerite,whose carbon isotope (δ13C) ranged from -15.1‰ to -1.3‰ with an average value of -6.01‰,and oxygen isotope (δ18O) ranged from -17.8‰ to -11.2‰ with an average value of -15.06‰,and Z-value of paleosalinity ranged from 87.71 to 117.77 with an average value of 107.5.The above results showed that small amount of organic carbon involved in the early diagenesis of Jurassic sandstones in Jiulongshan Region,and diagenetic fluids were mainly leaching freshwater from clast and atmosphere.The temperature to form carbonate cements was 78.5-126.55℃ with an average value of 105.86℃.According to paleo-goethermal gradient,the burial depth of Jurassic sandstones should be about 2.5km,but the actual burial depth was less than 1.6km,so it was concluded that the Jurassic Formation in Jiulongshan region had experienced strong tectonic movement and were uplifted about 1.0km after deeply buried.
 

Key words:

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  • TE122.2

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