Quantitative Study on Sealing Ability of Ultra－Pressure Caproc
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摘要: 根据低速渗流理论及松辽盆地嫩江组一段超压盖层的实际资料,证实盖层超压形成的本质因素是盖层毛细管孔隙的吸附阻力。在此基础上,论证了盖层超压的封闭能力是该盖层超压值的 2倍,超压盖层的总封闭能力是盖层底部岩石排替压力与 2倍盖层趄压值之和;结合超压盖层的成岩演化史及烃源岩生排烃史研究了超压盖层形成时间及其封烃有效性的评价方法,并以松辽盆地大庆长垣以东地区嫩江组一段区域盖层为例,研究了该盖层超压对其下部青山口组源岩层生排出的油气封盖的有效性。根据超压盖层的特点,论述了超压盖层在油气保存过程中的意义。Abstract: According to theory of low-velocity seepage and the true information of ultra-pressure caprock of the first section in Nenjiang group in Songliao Basin, the essence factor forming ultra-pressure in caprock is discussed in this paper, it is adsorption resistance of capillary for water in caprock. It has been confirmed that the sealing ability of the ultra-pressure of caprock is equal to twice as much as ultra-pressure value of fluid in the pore of caprock, the total sealing ability of ultra-pressure caprock is equal to the sum of displacement pressure and twice ultra-pressure value of caprock. The forming time of ultra-pressure caprock, effectiveness of ultra-pressure caporock for sealing hydrocarbon and evaluating method are researched, and take the regional caprock of the first section in Nenjiang group to the east of Daqing placantiline in Songliao Basin as example, the effectiveness that the ultra-pressure caprock seals the oil and gas coming from the source rock of Qingshankou group is studied, the significance of ultra-pressure caprock for to protect hydrocarbons is generally discussed.
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Key words:
- caprock /
- seal /
- displacement pressure /
- adsorption resistance /
- ultra-pressure caprock
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[1] 葛家理.油气层渗流力学[M] .北京：石油工业出版杜,1982,28～29 [2] 吕延防,付广,高大岭.油气藏封盖研究[M] .北京：石油工业出版社,1996,60～65 [3] 付广.欠压实泥岩是最有利的油气封盖层[J] .小型油气藏,1997,(1)：11～15 -
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