超压对泥岩盖层封闭各种相态天然气的作用研究Effect of overpressure on mudstone caprock sealing gas in each phase
杨殿军
YANG Dian-jun(Daqing Petroleum Institute
摘要(Abstract)：
研究超压对泥岩盖层封闭各种相态天然气的作用结果表明,超压使泥岩盖层致密层孔渗性降低、排替压力增大、封闭游离相天然气能力增强,超压值越大,封闭游离相天然气能力越强,反之则越弱。超压使泥岩盖层致密层压实成岩程度增强,吸附阻力增大,封闭水溶相天然气能力增强,超压值越大,封闭水溶相天然气能力越强,反之则越弱。超压使具生烃能力的泥岩盖层中含气浓度增大,对扩散相天然气形成了更强的浓度封闭作用,超压值越大,对扩散相天然气的浓度封闭能力越强,反之则越弱。
Based on the study on formation mechanism and conditions of overpressure,the effect of overpressure on mudstone caprock sealing gas in each phase is studied.The research results indicate,overpressure makes the porosity and permeability of tight layer reduce,the displacement pressure increase, the ability sealing gas in free phase increase.The bigger value of overpressure is,the stronger the ability to seal gas in separate phase enhances,and vice versa.Overpressure makes compaction diagenetic grade of tight mudstone caprock increase,the adsorption force increase,and the ability to seal gas in water-dissolving phase increase.The higher overpressure value is,the stronger the ability to seal gas in water-dissolved phase is,and vice versa.Overpressure makes gas-bearing concentration in overpressured mudstone caprock that has hydrocarbon generation ability increase,and forms stronger concentration sealing for gas in aqueous fusion phase.The higher overpressure value is,the stronger the concentration seal ability for gas in diffuse phase is,and vice versa.
关键词(KeyWords)：
超压;泥岩盖层;相态;天然气;封闭能力
overpressure;mudstone caprock;phase;natural gas;sealing ability
基金项目(Foundation): 国家“973”重点基础研究项目(2001CB209104)资助
作者(Author):
杨殿军
YANG Dian-jun(Daqing Petroleum Institute
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