| 陕西韩城-旬邑地区中奥陶统马家沟组豹斑白云岩研究 |
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| 引用本文： | 陈曦,吕波,黄素,何施雨,杜亚曦,朱讯.陕西韩城-旬邑地区中奥陶统马家沟组豹斑白云岩研究[J].新疆地质,2011,29(2):222-225. |
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| 作者姓名： | 陈曦 吕波 黄素 何施雨 杜亚曦 朱讯 |
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| 作者单位： | 西南石油大学资源与环境学院,四川 成都,610500 |
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| 基金项目： | 西南石油大学课外开放实验校级重点项目资助 |
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| 摘 要： | 鄂尔多斯盆地奥陶系马家沟组白云岩是重要的油气储集层.从野外露头观察,白云岩斑块多呈管状、不规则状,是生物扰动后留下的虫孔遗迹.从镜下观察,斑块主要沿虫孔分布,成分为半自形-自形细粉晶白云石或具雾心亮边,基质为泥晶白云石.对研究区全岩C,O同位素和白云石有序度进行分析,得出白云石δ13C平均值为-0.26‰,δ18O平均-5.06‰;白云石CaCO3摩尔百分含量平均为50.4%,有序度为0.81~1.结合白云岩形成于半局限云质洼地沉积环境,认为豹斑白云岩发生了两期白云石化.一期是通过渗透回流生成泥晶白云岩;二期是在浅埋藏环境下,随着白云石化流体继续供给,虫孔中的泥晶白云石更易继续生长或发生重结晶,形成由细粉晶白云岩构成的斑块.因此,掘穴生物活动形成的潜穴,是造成不均匀白云岩化,形成豹斑的重要原因.
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| 关 键 词： | 豹斑白云岩 碳、氧同位素 有序度 马家沟组 |
STUDY OF LEOPARD FUR DOLOMITE IN MID-ORDOVICIAN MAJIAGOU FORMATION HANCHENG-XUNYI DISTINCT IN SHANXI PROVINCE |
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| CHEN Xi,LV Bo,HUANG Su,HE Shi-yu,DU Ya-xi,ZHU Xun.STUDY OF LEOPARD FUR DOLOMITE IN MID-ORDOVICIAN MAJIAGOU FORMATION HANCHENG-XUNYI DISTINCT IN SHANXI PROVINCE[J].Xinjiang Geology,2011,29(2):222-225. |
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| Authors: | CHEN Xi LV Bo HUANG Su HE Shi-yu DU Ya-xi ZHU Xun |
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| Institution: | CHEN Xi,LV Bo,HUANG Su,HE Shi-yu,DU Ya-xi,ZHU Xun(1.School of Resource and Environment,Chengdu,Sichuan,610500,China) |
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| Abstract: | The dolomite of the Ordovician Majiagou Formation is a significant resevoir in the Ordos Basin.The leopard fur dolomites were selected for detailed field and laboratory study.The shapes of leopard spot are tubal and irregular in the field.These wormhole shapes were caused by biology disturb activity.Microscope study indicated that leopard spots were distributed along wormhole,and composed of subhedral-idiomorphic cryptomere dolomites with nebulous-inner and bright-edge.The matrix is micrite dolomite.The ave... |
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| Keywords: | Leopard fur dolimites Carbon oxygen isotope Order degree Ordos Basin |
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