| 大气水在碎屑岩次生孔隙形成中的作用--以鄂尔多斯盆地三叠系延长组为例 |
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| 引用本文： | 黄思静,武文慧,刘洁,沈立成,黄成刚.大气水在碎屑岩次生孔隙形成中的作用--以鄂尔多斯盆地三叠系延长组为例[J].地球科学,2003,28(4):419-424. |
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| 作者姓名： | 黄思静 武文慧 刘洁 沈立成 黄成刚 |
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| 作者单位： | 成都理工大学油气藏地质及开发工程国家重点实验室，四川成都610059 |
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| 基金项目： | 西南石油学院校科研和教改项目，， |
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| 摘 要： | 鄂尔多斯盆地三叠系延长组砂岩储层分布于印支期不整合面之下，次生孔隙是最主要的石油储集空间，在大量薄片研究及资料统计的基础上，从岩石物性、长石溶蚀形成的次生孔隙、高岭石和长石含量纵向变化等证据出发，认为延长组砂岩储层次生孔隙的形成机制与印支期暴露时间间隔中大气水的溶解作用有关，而不是埋藏成岩过程中有机酸溶解作用的结果，同时人们也应对鄂尔多斯盆地延长组碎屑岩储层质量预测模式作必要更改。
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| 关 键 词： | 鄂尔多斯盆地 三叠系延长组 碎屑岩储层 次生孔隙 大气淡水 |
| 文章编号： | 1000-2383(2003)04-0419-06 |
Generation of Secondary Porosity by Meteoric Water during Time of Subaerial Exposure:An Example from Yanchang Formation Sandstone of Triassic of Ordos Basin |
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| HUANG Si-jing,WU Wen-hui,LIU Jie,SHEN Li-cheng,HUANG Cheng-gang.Generation of Secondary Porosity by Meteoric Water during Time of Subaerial Exposure:An Example from Yanchang Formation Sandstone of Triassic of Ordos Basin[J].Earth Science-Journal of China University of Geosciences,2003,28(4):419-424. |
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| Authors: | HUANG Si-jing WU Wen-hui LIU Jie SHEN Li-cheng HUANG Cheng-gang |
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| Abstract: | Secondary porosity is the most important reservoir space in the sandstone. The authors present an example of leaching by meteoric water in the Yanchang Formation sandstone of Triassic of Ordos basin. The interpretation is based on the information of detailed research of thin sections and a lot of statistical data. Yanchang Formation sandstone lies beneath the unconformity at the base of the Jurassic section. Subsequent detailed petrographic study has confirmed that the potassium depletion has brought about potassium feldspar dissolution, resulting in precipitation of kaolinite and creation of secondary porosity. The evidence strongly suggests the subaerial exposure of the Yanchang Formation sandstone in Early Jurassic and consequent freshwater leaching of the Yanchang Formation sandstone and generation of the secondary porosity. So secondary porosity of Yanchang Formation sandstone is not formed by the dissolution of organic acid during the time of burying diagenesis. The prediction model of reservoir quality should be modified by means of the new mechanisms of generation of secondary porosity. |
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| Keywords: | Ordos basin Yanchang Formation of Triassic clastic reservoir secondary porosity meteoric water |
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