• 责任者：Shi Wanzhong (Faculty of Earth Resources ; China University of Geosciences ; Wuhan 430074 ; China) ; Xu Huilong
• 刊名：Journal of China University of Geosciences
• 出版年：2007
• 卷期：18(3)
• 关键词：overpressure ; rock frame ; grain structure ; experimental measurement ; overpressure evolution
• 页码：p.
• 图表：8 illus., 1 table, 29 refs.
• issnNo：ISSN1002-0705
• isbnNo：CN42-1279/P

Overpressure    is  a  hot  topic  in  the  study  of  sedimentary   basins.  It  is  important  in generation, maturation migration, and accumulation of hydrocarbon, but the effects of overpressure on rock frame have not been investigated. In this study, experiments were carried out to study the effects of overpressure on rock frame structures using five core samples from the Junggar basin, Northwest China. The deformations and velocities for the samples were measured at different effective pressures related to non-equilibrium compaction and fluid expansion overpressure mechanisms. The results show that   the   effect  of   overpressure   on   rock   frames   gradually   increases   when   the   effective   pressure   drops down to a certain value (called critical pressure). Moreover, non-equilibrium compaction mechanism has   more   effects   on   rock   frames   than   fluid   expansion   mechanism   under  the   same   effective   pressure. Furthermore      to  study  rock   frame   structural  changes,   we   use  Kuster   and  Toksoz’s   expressions   to the effective aspect ratios of inclusions α(penny shapes) for different effective pressures. The results show that the αdecreases dramatically when the effective pressure decreases from the critical pressure.