| 松辽盆地三肇凹陷青山口组泥岩盖层封闭能力形成时期 |
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| 引用本文： | 付广,陈章明.松辽盆地三肇凹陷青山口组泥岩盖层封闭能力形成时期[J].地质论评,1998,44(3):295-301. |
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| 作者姓名： | 付广 陈章明 |
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| 作者单位： | 大庆石油学院勘探系，大庆石油学院勘探系，大庆石油学院勘探系，大庆石油学院勘探系 黑龙江安达，151400，黑龙江安达，151400，黑龙江安达，151400，黑龙江安达，151400 |
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| 摘 要： | 泥质岩盖层并非沉积开始就具有封闭油气能力的，而是随其埋深增加，压实成岩程度增强、粘土矿物转化脱水及有机质向烃类演化到一定阶段才开始具封闭油气能力的。本文在对盖层各种封闭能力进行地史恢复的基础上，确定出三肇凹陷青山口组泥岩盖层的毛细管、压力和烃浓度封闭能力开始形成时期分别为青山口组沉积末期、青山口组沉积末期和嫩江组四段沉积末期，都远远晚于上侏罗统气源岩的排气期（侏罗系沉积末期），因此，造成上侏罗统天
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| 关 键 词： | 泥质岩盖层 封闭能力 松辽盆地 青山口组 油气田 |
The Formation Period of the Sealing Ability of Mudstone Caprocks of the Qingshankou Formation in the Sanzhao Depression of the Songliao Basin |
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| Fu Guang,Chen Zhangming,Wang Pengyan and Lu Yanfang.The Formation Period of the Sealing Ability of Mudstone Caprocks of the Qingshankou Formation in the Sanzhao Depression of the Songliao Basin[J].Geological Review,1998,44(3):295-301. |
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| Authors: | Fu Guang Chen Zhangming Wang Pengyan and Lu Yanfang |
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| Abstract: | Argillaceous caprocks do not have the sealing ability when they begin deposition. This ability is obtained when their burial depth increases, the degree of compaction and diagenesis increases , clay minerals are transformed and dehydrated and the evolution of organic material to hydrocarbon preceeds to a certain stage. On the basis of the geohistorical reconstruction of various kinds of sealing ability of caprocks, the authors have distinguished three periods of initiation of the sealing ability of the capillaries, fluid pressure and hydrocarbon concentration of the mudstone caprocks of the Qingshankou Formation in the Sanzhao depression, i. e. : the terminal period of deposition of the Qingshankou Formation, the terminal period of deposition of the Qingshankou Formation and the terminal period of deposition of the fourth member of the Nengjiang Formation, which are all far later than the gas expulsion period of the Upper Jurassic gas source rocks (the terminal period of Jurassic deposition. Therefore, the loss of substantial natural gas in the Upper Jurassic might be the important cause for the fact that only some medium- and small -sized gas fields have been found in the study area, while large gas fields cannot be found. |
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| Keywords: | argillaceous caprock sealing ability formation period of sealing ability Songliao basin Sanzhao depression Qingshankou Formation |
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