| 新疆三塘湖盆地马朗凹陷中二叠统芦草沟组泥页岩层系SiO2赋存状态与成因 |
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| 引用本文： | 刘国恒,黄志龙,郭小波,刘再振,高潇玉,陈常超,张成林,王昕.新疆三塘湖盆地马朗凹陷中二叠统芦草沟组泥页岩层系SiO2赋存状态与成因[J].地质学报,2016,90(6):1220-1235. |
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| 作者姓名： | 刘国恒 黄志龙 郭小波 刘再振 高潇玉 陈常超 张成林 王昕 |
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| 作者单位： | 中国石油大学（北京）,中国石油大学（北京）,西安石油大学,中国石油大学（北京）,中国石油大学（北京）,中国石油大学（北京）,中国石油大学（北京） |
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| 基金项目： | 国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 摘 要： | 为了弄清新疆三塘湖盆地马朗凹陷芦草沟组泥页岩层系中SiO_2对储集层物性、脆性等特性的影响,通过全岩和黏土矿物X衍射、岩石力学性质、阴极发光、扫描电镜及电子能谱等实验手段对其中SiO_2的赋存状态进行了研究,初步探讨了SiO_2不同形态赋存的机理,并在此基础上探究了石英含量对储层的影响。研究表明:凝灰岩、泥页岩和粉砂质泥岩中二氧化硅多以非晶态形式存在。二氧化硅在凝灰岩中多呈不规则球粒状,而在泥页岩和粉砂质页岩中无固定形态。凝灰质泥岩、凝灰质白云岩和白云岩中二氧化硅呈现一定的晶体形态。在凝灰质泥岩中,二氧化硅以自生石英形态聚集呈条带状,在凝灰质白云岩中则以自生石英形态发育于孤立的孔、洞之中,而白云岩中二氧化硅只能生长成Opal-A/Opal-CT阶段。凝灰质成分及其脱玻化作用为自生石英的生长提供了二氧化硅和生长空间,是控制SiO_2赋存状态的根本因素。此外,储集层孔隙度、渗透率和抗压强度都与石英含量呈一定正相关性,泊松比则与其呈负相关性。
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| 关 键 词： | 关键词：非晶态二氧化硅 自生石英 脱玻化作用 扫描电镜 三塘湖盆地 马朗凹陷 |
| 收稿时间： | 2014/11/24 0:00:00 |
| 修稿时间： | 2/6/2015 12:00:00 AM |
The SiO2 Occurrence and Origin in the Shale System of Middle PermianSeries Lucaogou Formation in Malang Sag, Santanghu Basin, Xinjiang |
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| LIU Guoheng,HUANG Zhilong,GUO Xiaobo,LIU Zaizhen,GAO Xiaoyu,CHEN Changchao,ZHANG Chenglin and WANG Xin.The SiO2 Occurrence and Origin in the Shale System of Middle PermianSeries Lucaogou Formation in Malang Sag, Santanghu Basin, Xinjiang[J].Acta Geologica Sinica,2016,90(6):1220-1235. |
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| Authors: | LIU Guoheng HUANG Zhilong GUO Xiaobo LIU Zaizhen GAO Xiaoyu CHEN Changchao ZHANG Chenglin and WANG Xin |
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| Institution: | China University of Petroleum,China University of Petroleum,XI`AN University of Petroleum,China University of Petroleum,China University of Petroleum,China University of Petroleum,China University of Petroleum |
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| Abstract: | Abstract: SiO2 occurrence in the shale system of Lucaogou formation in Malang sag, Santanghu basin was studied by a series method of cathode luminescence, SEM and EDS. Silica in tuff, mud shale and silty mudstone is mainly amorphous with irregularity in tuff and any geometry in others. However, Silica in tuffaceous mudstone and tuffaceous dolomite shows crystal morphology with ribbonlike gathered authigenic quartz in tuffaceous mudstone and separate settlement in tuffaceous dolomite, while silica in dolomite is the stage of Opal-A/Opal-CT. Tuffaceous matter is the main source of silica. Devitrification and space are the key factors for SiO2 occurrence. |
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| Keywords: | Keywords: amorphous silica authigenic quartz devitrification SEM Santanghu basin Malang Sag |
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