Rock Mechanic Experiment Study of Evaluation on Cap Rock Effectiveness
详细信息
- 责任者：Li Shuangjian (Research Institute of Exploration and Production ; SINOPEC ; Beijing 100083 ; China) ; Zhou Yan
- 刊名：Petroleum Geology & Experiment
- 出版年：2013
- 卷期：35(5)
- 关键词：盖层 ; cap rocks ; 岩体力学 ; rock mechanics
- 页码：p.574-578,586
- 图表：7 illus., 4 tables, 31 refs.
- 分类号：1003
- issnNo：ISSN1001-6112
- isbnNo：CN32-1151/TE
摘要
The brittle-ductile transition process is simulated through triaxial compression test,and the breaking process is simulated through triaxial unloading test in this paper. The brittle-ductile transition threshold limit confining pressure of gypsum,mudstone and marlstone are gotten by triaxial compression test of 70 samples.They are 68. 5,81. 35 and 92. 35 MPa,respectively,which amount to buried depth of 4 029,4 782 and 5 429m,respectively. The mathematical relation between break confining pressure and principal compressive pressure is gotten by triaxial unloading test. The mathematical formula is y = 2. 929 6 x + 134. 28( R2= 0. 83). The study results not only prove that mudstone has plastic and sealing capability at certain buried depth,but also provide quantitative evaluation parameters of brittle- ductile transition and break limit condition of cap rock,which lay the foundation for quantitative evaluation on cap rock effectiveness.