盖层封闭性研究中的几个问题

Several discussions of sealing capacity studies of caprock

对高演化泥岩的封闭性、盖层厚度与封闭能力的关系、盖层的微观封闭机制以及盖层封闭性动态演化定量评价等方面进行了论述。高演化泥岩只要在后期构造改造过程中没有遭受破坏,同样可以具有优质的封闭性能。盖层封闭天然气的气柱高度与盖层厚度密切相关。物性封闭是盖层最普遍的封闭机理,烃浓度封闭不具普遍性。泥质盖层封闭性动态演化可以分建造阶段和改造阶段分别进行定量恢复,建造阶段采用孔隙度—排替压力史法,抬升剥蚀改造阶段采用渗透率—排替压力史法和/或超固结比史法。

It is discussed in this paper the sealing capacity of highly mature mudstone, the relationship between caprock thickness and sealing capacity, the microcosmic sealing mechanism of caprock and the quantitative evaluation of sealing capacity evolution. Highly mature mudstones may have good sealing capacity if they were not destroyed during tectonic deformation. The height of sealed natural gas column is closely related to caprock thickness. Capillary sealing is the most common sealing mechanism, while hydrocarbon concentration sealing is not very common. The dynamic evolution of sealing capacity of mudstone may be divi carried out according to is introduced. Permea reformation stage. into 2 stages, formation and reformation. Quantitative reconstruction 2 stages. As to the formation stage, porosity--displacement pressure ty--displacement pressure and/or OCR method are used in studies t can be method of the reformation stage.