| 煤系地层中砂岩火山尘填隙物的成岩作用特征——以鄂尔多斯盆地天然气储层为例 |
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| 引用本文： | 李向博,王建伟.煤系地层中砂岩火山尘填隙物的成岩作用特征——以鄂尔多斯盆地天然气储层为例[J].岩石矿物学杂志,2007,26(1):42-48. |
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| 作者姓名： | 李向博 王建伟 |
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| 作者单位： | 1. 中国科学院,地球化学研究所,矿床地球化学国家重点实验室,贵州,贵阳,550002;胜利油田,现河采油厂,地质所,山东,东营,257062
2. 胜利油田,现河采油厂,地质所,山东,东营,257062 |
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| 基金项目： | 国家重点基础研究发展计划(973计划);教育部石油天然气成藏机理重点实验室基金 |
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| 摘 要： | 在晚石炭世—早二叠世,鄂尔多斯盆地泥炭沼泽环境下发育的富含火山尘填隙物砂岩是煤成气的主要储集层。研究表明,该类砂岩的原杂基主要由同沉积期初步水化作用的火山尘构成;在煤系地层水环境下,火山尘经过初步水化作用后并不能形成沸石族矿物,主要形成了铝硅酸盐和硅酸盐的微细混合物;在埋藏过程中,砂岩火山尘填隙物的水岩反应受到煤系地层水介质性质及其活动性影响,主要发生脱水收缩作用、溶解作用、蚀变作用、碳酸盐交代作用和重结晶作用;火山尘填隙物的成岩作用在局部范围内可改善天然气储层,但也增强了储层的非均质性。
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| 关 键 词： | 火山尘填隙物 成岩作用 煤系地层 天然气储层 鄂尔多斯 |
| 文章编号： | 1000-6524（2007）01-0042-07 |
| 修稿时间： | 2006-01-13 |
The formation and evolution of volcanic dust fillings of sandstone in coal measures strata of Ordos Basin |
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| LI Xiang-bo,WANG Jian-wei.The formation and evolution of volcanic dust fillings of sandstone in coal measures strata of Ordos Basin[J].Acta Petrologica Et Mineralogica,2007,26(1):42-48. |
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| Authors: | LI Xiang-bo WANG Jian-wei |
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| Institution: | 1. State Key Laboratory of Ore Deposits Geochemistry, Chinese Academy of Sciences, Guizhu 550002, China; 2. Oil Production Plant, Shengli Oilfield, Dongying 257062, China |
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| Abstract: | During the period of Late Carboniferous and Early Permian, the sandstone with abundant volcanic dust fillings was mainly deposited in a peat marsh environment, which constituted a favorable reservoir of coal-formed gas in Ordos Basin. Studies show that the original fillings of sandstone are mainly superficially hydrolyzed volcanic dust, which is a superfine mixture of aluminosilicate and silicate. It is difficult for volcanic dust to form zeolite during hydrolyzing under the condition of acidic syngenetic water in a peat marsh environment. The tuff fillings of sandstone are susceptible to the property and activity of the formation water, and have mainly experienced synaeresis, dissolution, alteration, carbonate metasomatism and recrystallization in a burial environment. The evolution of tuff fillings of sandstone can improve the quality of reservoir locally, but enhance the heterogeneity of reservoir regionally. |
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| Keywords: | volcanic dust fillings diagenesis coal-bearing formation gas reservoir Ordos Basin |
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