Several Discussions of Sealing Capacity Studies of Caprock
详细信息
- 责任者：Yuan Yusong (SINOPEC Exploration & Production Research Institute ; Beijing 100083 ; China) ; Fan Ming
- 刊名：Petroleum Geology & Experiment
- 出版年：2011
- 卷期：33(4)
- 关键词：盖层 ; cap rocks ; 泥岩 ; mudstone
- 页码：p.336-340,347
- 图表：illus., 44 refs.
- 分类号：1003
- issnNo：ISSN1001-6112
- isbnNo：CN32-1151/TE
摘要
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 divided into 2 stages: formation and reformation.Quantitative reconstruction can be carried out according to the 2 stages.As to the formation stage,porosity-displacement pressure method is introduced.Permeability-displacement pressure and/or OCR method are used in studies of the reformation stage.