| 鄂尔多斯盆地东部太原组碎屑岩中自生伊利石形成机制及其对储层形成的影响 |
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| 引用本文： | 黄思静,孙伟,黄培培,佟宏鹏,刘丽红.鄂尔多斯盆地东部太原组碎屑岩中自生伊利石形成机制及其对储层形成的影响[J].矿物岩石,2009,29(4). |
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| 作者姓名： | 黄思静 孙伟 黄培培 佟宏鹏 刘丽红 |
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| 作者单位： | 油气藏地质及开发工程国家重点实验室(成都理工大学),四川,成都,610059;成都理工大学沉积地质研究院,四川,成都,610059 |
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| 摘 要： | 鄂尔多斯盆地东部太原组砂岩骨架颗粒中几乎没有碎屑长石,残余的微量长石(在岩石中的平均含量为0.4%.低于X射线衍射检测限)主要为钾长石,同时具有较低的自生高岭石含量(1.02%)、很低的自生石英含量和同期火山物质含量,以及较高的自生伊利石含量(1.22%),这表明太原组的自生伊利石主要是在相对高温的深埋藏封闭条件下,通过钾长石溶解反应:钾长石+H~++H_2O→高岭石+硅质+K~+和高岭石伊利石化反应:高岭石+K~+→伊利石+H~++H_2O或其加和反应:钾长石+高岭石→硅质+伊利石+H_2O形成,后者通过消耗钾离子而克服钾长石溶解的动力学屏障,是前者的重要驱动反应,并向流体输出氢离子,因此对次生孔隙的形成、尤其是在相对深埋藏的成岩过程中与钾长石溶解有关的次生孔隙的形成具有显著的积极作用.
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| 关 键 词： | 鄂尔多斯盆地 太原组 碎屑岩储层 自生伊利石 次生孔隙 |
THE ORIGIN OF AUTHIGENIC ILLITE AND ITS EFFECTS ON RESERVOIR QUALITY: A CASE STUDY FROM TAIYUAN SANDSTONE, EASTERN ORDOS BASIN |
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| HUANG Si-jing,SUN Wei,HUANG Pei-pei,TONG Hong-peng,LIU Li-hong.THE ORIGIN OF AUTHIGENIC ILLITE AND ITS EFFECTS ON RESERVOIR QUALITY: A CASE STUDY FROM TAIYUAN SANDSTONE, EASTERN ORDOS BASIN[J].Journal of Mineralogy and Petrology,2009,29(4). |
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| Authors: | HUANG Si-jing SUN Wei HUANG Pei-pei TONG Hong-peng LIU Li-hong |
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| Abstract: | There is hardly any feldspar in the Taiyuan Formation in the east of Ordos Basin,and the trace remaining (the average level in the sand is 0.4% ,under the XRD detection limit) is pri-marily K-feldspar. Meanwhile, the reservoir is characterized by low authigenic kaolinite,a very low authigenic quartz and large amount of authigenic illite,suggesting that authigenic illite in Taiyuan Formation is formed under a condition of deeply buried,relative high temperature and closed sys-tem, through K-feldspar dissolution reaction: K-feldspar + H~++ H_2 O→kaolinite + SiO_2 + K~+ and illitization of kaolinite:kaolinite +K~+→illite+ H~+ + H_2O, or the plus reaction of the above two: K-feldspar + kaolinite→SiO_2 +illite+ H_2O. Through the consuming of potassium ion,illitization of kaolinite overcomes kinetics barrier of K-feldspar dissolution, then drives the K-feldspar disso-lution reaction,and meanwhile outputs the hydrogen ion to fuild,which plays an important role in the formation of secondary porosity, particularly those secondary porosity with regard to K-feld-spar dissolution in the deeply buried diagenetic process. The entire reservoir space is almost sec-ondary porosity;and its formation mechanism can be attributed to the above-mentioned reactions. |
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| Keywords: | Ordos Basin Taiyuan Formation clastic reservoir authigenic illite secondary poros-ity |
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