松辽盆地东南部物性盖层特征

PHYSICAL PROPERTY CHARACTERISTICS OF CAP ROCKS IN THE SOUTHEASTERN PART OF THE SONGLIAO BASIN

陈强路

CHEN Qiang-lu

中国石化新星公司实验地质研究院, 江苏无锡 214151

Research Institute of Experimental Geology, CNSPC, Wuxi, Jiangsu 214151, China

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。

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.

中国新星石油公司科技项目(96-14)

https://doi.org/10.11781/sysydz200002175