| 鄂尔多斯盆地东南缘延长组石油充注对砂岩储层成岩演化的影响 |
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| 引用本文： | 袁珍,李文厚,郭艳琴.鄂尔多斯盆地东南缘延长组石油充注对砂岩储层成岩演化的影响[J].高校地质学报,2011,17(4):594-604. |
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| 作者姓名： | 袁珍 李文厚 郭艳琴 |
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| 作者单位： | 1. 西北大学 地质系 西安 710069；2. 西安石油大学 油气资源学院 西安 710065 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)基金资助项目，陕西省教育厅自然科学专项科研计划项目 |
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| 摘 要： | 综合运用岩石学、矿物学和地球化学方法，对石油充注鄂尔多斯盆地东南缘三叠系延长组砂岩储层后的成岩反应系
统进行了研究，揭示了石油充注对储层成岩环境的改变在一定程度上影响了本区储层成岩作用的演化。研究表明，该区延
长组长石砂岩储层在石油充注后有机酸和CO2大量出现，pH值降低，促进了岩石骨架颗粒长石的溶解，导致了次生孔隙的发
育，增强了储层的储集性能，但未能增加石英的溶解度；但是由于含油饱和度偏低，石油的充注使成岩环境的变化仅在很
小程度上抑制伊利石的生长，并没有完全阻止伊利石的生长，伊利石“搭桥”胶结孔隙，一定程度上降低了储层的储集性
能；同时石油的充注也使成岩早期形成的碳酸盐胶结物出现溶解，当成岩温度>100℃时，有机质热演化产生较高的CO2分
压，缓冲了pH值使含铁碳酸盐大量沉淀从而使储层致密化。石油充注对储层的这些影响对下一步的储层评价提供了重要依
据。
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| 关 键 词： | 石油充注 鄂尔多斯盆地东南缘 延长组 长石砂岩 成岩反应系统 成岩演化 |
| 收稿时间： | 2010-04-23 |
| 修稿时间： | 2010-11-29 |
Effects of Oil Emplacement on Diagenetic Evolution of Sandstone Reservoir in Yanchang Formation, Southeastern Ordos Basin |
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| YUAN Zhen,LI Wen-hou,GUO Yan-qin.Effects of Oil Emplacement on Diagenetic Evolution of Sandstone Reservoir in Yanchang Formation, Southeastern Ordos Basin[J].Geological Journal of China Universities,2011,17(4):594-604. |
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| Authors: | YUAN Zhen LI Wen-hou GUO Yan-qin |
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| Institution: | 1. Department of Geology, Northwest University, Xi,an 710069, China;
2. School of Petroleum Resources, Xi,an Shiyou University, Xi,an 710065, China |
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| Abstract: | Using comprehensive lithological, mineralogical, and geochemical methods, this paper studies the diagenetic
interaction system after oil injection into the sandstone reservoir of Triassic Yanchang formation in southeastern Ordos basin. Wedemonstrate that the change of diagenetic environment after oil emplacement in certain degree affected the diagenetic evolution of the reservoir. In the arkose reservoir of this area, organic acid and carbon dioxide appeared in a large amount after oil injection and the pH value decreased, which promoted dissolution as the rock matrix of feldspar particles, resulted in the development of secondary pores, and enhanced the property of reservoir. However, due to low oil saturation, the change of diagenetic environment restrained illite growth slightly. To certain extent, the pore“ bridging” cement of illite reduced the property of reservoir.Meanwhile, the oil emplacement resulted in dissolution of carbonate cement formed in the early diagenetic stage. While the diagenetic temperature was higher than 100℃, the thermal evolution of organic matter would produce higher carbon dioxide partial pressure, which buffered pH value, precipitated a large amount of iron carbonate cements, and compacted the reservoir sediments. |
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| Keywords: | oil emplacement southeastern Ordos basin Yangchang Formation diagenetic interaction system diagenetic evolution |
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