| 辽河盆地东部凹陷天然气盖层评价 |
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| 引用本文： | 张占文,陈永成.辽河盆地东部凹陷天然气盖层评价[J].沉积学报,1996,14(4):102-107. |
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| 作者姓名： | 张占文 陈永成 |
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| 作者单位： | 辽河石油勘探局勘探开发研究院 辽宁盘锦兴隆台 124010 |
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| 摘 要： | 辽河盆地东部凹陷为辽河盆地三大凹陷之一，位于辽宁省境内的下辽河平原。本文通过东部凹陷盖层类型，岩石学特征与盖层品质的关系，压实作用对盖层封盖性能的影响及火山岩盖层封盖性能分析，指出东部凹陷虽缺乏区域性盖层，但局部盖层十分发育，其中火山岩是最好的盖层，不同层次的泥岩盖层变化较大，主要形成期为中深层的突变压实阶段和紧密压实阶段，浅层火山岩的发育弥补了泥岩的不足，并根据泥岩盖层与储层的匹配关系研究指出:“东部凹陷浅层是差的盖层匹配好储层，深层则相反”。从泥岩盖层角度出发认为中深层应是大中型气藏形成的有利场所，浅层则是小型气藏发育的有利部位，但本区封盖性能很好的火山岩发育，使其为主的盖层，增加了浅层形成较大型气藏的可能，从而打破了以泥岩盖层为主的纵向天然气分布格局，同时通过东部凹陷不同层位、不同深度层次泥岩盖层突破压力分布特点，结合火山岩分布特征，指出了本区下部勘探方向。
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| 关 键 词： | 辽河 东部凹陷 盖层 勘探 |
| 收稿时间： | 1995-11-01 |
Caprock Evaluation of Natural Gas Reservoir within the Eastern Depression, Liaohe Rift |
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| Zhang Zhanwen and Chen Yongcheng.Caprock Evaluation of Natural Gas Reservoir within the Eastern Depression, Liaohe Rift[J].Acta Sedimentologica Sinica,1996,14(4):102-107. |
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| Authors: | Zhang Zhanwen and Chen Yongcheng |
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| Institution: | Liaohe Petroleum Exploration Bureau,LianNing 124010 |
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| Abstract: | The Eastern depression is one of the three depressions of Liaohe Rift and located in the lower Liaohe plain in Liaoning Province. This paper indicates by means of the analysis of caprock types, effect of compaction on seal ability of caprocks and the seal ability of volcanic caprocks that local caprocks are very developed, of which the best caprock is the volcanic rock, although the depression lacks the regional caprock. The variation of shale caprocks in different beds is great. The mudstone caprock was formed in the periods of saltatory and tight compactions in the middle-deep horizons, but the volcanic caprock complemented the lack of mudstone caprock in shallow horizons. Based on the relationship between mudstone caprock and reservoir, it is known that there is a poor caprock but good reservoir in shallow horizons, but it is contrary in deep horizons. In view of mudstone caprock, the medium-large gas reservoirs should be formed in middle-deep horizons, and small gas reservoirs should be formed in shallow horizons. However, in the depression well-developed volcanic caprocks increased the probability of formation of large gas reservoirs in shallow horizons, which broke the regularity of vertical distribution of natural gas on the condition of mudstone caprock. According to the distribution of breakthrough pressure of mudstone caprock in different horizons and depths as well as the distribution of volcanic rocks, the exploration potential of gas reservoirs in deep horizons was proposed. |
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| Keywords: | caprook evaluation\ eastern depression\ caprock\ exploration |
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