PHYSICAL PROPERTY CHARACTERISTICS OF CAP ROCKS IN THE SOUTHEASTERN PART OF THE SONGLIAO BASIN
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摘要: 松辽盆地东南部盖层以泥质岩为主,下白垩统青山口组及其上部湖相泥岩为本区北部良好的地区性盖层。泉三、二段(K1q2、K1q3)上部泥岩段既是本区的地区性盖层,又是其下伏气层的临界盖层。盖层突破压力大于气藏剩余压力和储层岩石排替压力,封气高度大于气藏高度,可以形成有效封闭。盖层封闭机理与微孔结构的关系表明,盖层类型以微裂缝与微孔混合型为主。Abstract: The cap rocks in the southeastern part of the Songliao Basin are dominated by argillite. The Lower Cretaceous Qingshankou Formation and its upper lacustrine-facies mudstone are good regional cap rocks in the northern part of the area. The upper mudstine of the Quansan(K1g3) and Quaner(K1g2) Members is not only the regional cover of the area, but also the critical cover of its underlying gas reservoirs. The breakthrough pressure of the cover is greater than the residual pressure of gas pools and the displacement pressure of reservoir rocks, and the gas-sealing height is greater than the height of gas pools. So, effective sealing is formed. The relationship between the sealing mechanism of cap rocks and the texture of micropores shows that the styles of the cap rocks are dominated by the compound style of microfissures and micropores.
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Key words:
- styles of cap rocks /
- effectiveness of sealing /
- physical cap rocks
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[1] 张义纲.天然气的生成聚集和保存[M].南京:河海大学出版社,1991.148-158. [2] 郝石生,等.天然气藏的形成和保存[M].北京:石油工业出版社,1995.91-101. [3] 刘树根,等.川东石炭系气藏的封盖条件研究[J].成都理工学院学报,1996,23(3):69-78. [4] 陈荣书.天然气地质学[M].武汉:中国地质大学出版社,1989. [5] 郑朝阳,等.盖层类型及其对油气运移聚集的控制作用[J].石油与天然气地质,1996,17(2):96-101.
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