| 鄂尔多斯盆地中东部米脂地区奥陶系马五5亚段叠层石白云岩特征及其地质意义 |
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| 引用本文： | 罗振锋,苏中堂,廖慧鸿,黄文明,马慧,佘伟. 鄂尔多斯盆地中东部米脂地区奥陶系马五5亚段叠层石白云岩特征及其地质意义[J]. 岩性油气藏, 2022, 34(2): 86-94. DOI: 10.12108/yxyqc.20220208 |
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| 作者姓名： | 罗振锋 苏中堂 廖慧鸿 黄文明 马慧 佘伟 |
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| 作者单位： | 1. 成都理工大学 沉积地质研究院, 成都 610059;2. 油气藏地质及开发工程国家重点实验室, 成都 610059;3. 中国石油川庆钻探工程有限公司 苏里格项目经理部, 成都 610051 |
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| 基金项目： | 国家自然科学青年基金项目“鄂尔多斯盆地天环地区下奥陶统白云岩成因机制分析”(编号:41302087)资助。 |
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| 摘 要： | 鄂尔多斯盆地中东部米脂地区马五5亚段底部发育一套叠层石白云岩,是研究微生物岩及微生物白云岩化作用的良好素材.通过岩石学、矿物学、阴极发光、扫描电镜、碳氧锶同位素及地球化学等分析,对米脂地区奥陶系马五5亚段叠层石白云岩进行了研究,确定了马五5亚段沉积环境,并探讨了该套叠层石白云岩的成因及其地质意义.研究结果表明:①研究区...
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| 关 键 词： | 叠层石白云岩 渗透回流白云岩化 潮坪 马五5亚段 奥陶系 米脂地区 鄂尔多斯盆地 |
| 收稿时间： | 2021-05-24 |
Characteristics and geological significance of stromatolite dolomite of Ma 55 submember of Ordovician Majiagou Formation in Mizhi area,central-eastern Ordos Basin |
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| LUO Zhenfeng,SU Zhongtang,LIAO Huihong,HUANG Wenming,MA Hui,SHE Wei. Characteristics and geological significance of stromatolite dolomite of Ma 55 submember of Ordovician Majiagou Formation in Mizhi area,central-eastern Ordos Basin[J]. Northwest Oil & Gas Exploration, 2022, 34(2): 86-94. DOI: 10.12108/yxyqc.20220208 |
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| Authors: | LUO Zhenfeng SU Zhongtang LIAO Huihong HUANG Wenming MA Hui SHE Wei |
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| Affiliation: | 1. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China;2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610059, China;3. Sulige Project Management Department, Chuanqing Drilling Engineering Co., Ltd., CNPC, Chengdu 610051, China |
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| Abstract: | A set of stromatolite dolomite developed at the bottom of Ma 55 submember of Majiagou Formation in Mizhi area,central-eastern Ordos Basin,which is a good material for studying microbial rocks and microbial dolomitization.The stromatolite dolomite was studied through the analysis of petrology,mineralogy,cathodoluminescence,scanning electron microscope,carbon,oxygen and strontium isotopes,geochemistry,the sedimentary environment of Ma 55 submember was determined,and the genesis and geological significance of this set of stromatolite dolomite were discussed.The research results show that:(1)The stromatolites in the study area can be divided into columnar and dendritic according to the morphological characteristics,the dolomite crystal is microcrystalline,and it is dark red in the cathodoluminescence,and the dolomite is granular under the scanning electron microscope.(2)Theδ13C value of stromatolite dolomite(-4.15‰--0.80‰)is generally within the range of seawater value in the same period,and theδ18O value(-13.19‰--6.62‰)is obviously negative compared with the seawater value in the same period.The 87Sr/86Sr value(0.7089-0.7098)is higher than that of seawater in the same period.The contents of Fe,Mn,Na of the stromatolite dolomite are relatively high,and the Sr content is relatively low.The dolomitization fluid of the stromatolite dolomite of Ma 55 submember in the study area is mainly marine-derived fluid,mixed with atmospheric fresh water,which is the product of shallow buried infiltration and reflux in the intertidal-subtidal zone.(3)The intertidal zone with seawater salinity conversion in the early stage of transgression is a favorable area for oil and gas exploration of stromatolite dolomite. |
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| Keywords: | stromatolite dolomite seepage reflux dolomitization tidal flat Ma 55 submember Ordovician Mizhi area Ordos Basin |
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