剥蚀减压过程中的砂体回弹作用及其成藏效应研究综述  

Summarization of Sandstone Rebounding Due to Unload and Its Effects on Oil/Gas Migration and Accumulation

作　　者：田丰华[1] 姜振学[1] 

机构地区：[1]中国石油大学盆地与油藏研究中心

出　　处：《地质科技情报》2008年第1期64-68,共5页Geological Science and Technology Information

基　　金：国家自然科学基金项目(40372071;40472078)

摘　　要：众多的实例研究表明,地层抬升剥蚀与地层低压的发育存在明显的正相关关系。地层抬升剥蚀过程中发生的物理变化,如流体向下倾方向泄漏、流体因温度降低而收缩,下伏砂体因卸载而回弹都倾向于形成地层低压。物理模拟实验结果表明砂体回弹量最大可超过1%,它对地层低压形成的贡献远远大于其他因素,砂体回弹泵吸抽拉成藏是一种新的成藏机理。要深入探讨砂体回弹对油气成藏的贡献,还必须开展以下工作:①弄清砂岩和泥岩回弹量的差异性;②建立岩石回弹和地层压力变化的直接定量关系;③研究低压形成过程中的油水运移状态;④定量评价砂体回弹对油气成藏的贡献。物理模拟实验将是开展这些工作不可或缺的手段。Many studies indicate that the lifting and erosion of strata has a positive relationship with the underpressure in the strata. The physical changes during the lifting and erosion, such as fluid downward leaking, fluid contraction with the declining temperature and sandstone rebound due to unloading, tend to form underpressure. The physical simulation experiment proves that the maximum rebound of the sandstone over 1% is more responsible for the formation of the underpressure than other factors. Hence, ＂pumping hydrocarbon by sandstone rebound＂ is taken as a new hydrocarbon accumulation mechanism by many scholars. It is suggested by the authors of this paper that some more researches should be done to identify the contribution of the sandstone rebound to the hydrocarbon accumulation： 1） the different rebound of the sandstone and the mudstone; （2） the direct and quantitative relationship between the sandstone rebound and the strata pressure; （3）different flow of oil and water during the process of the underpressure accumulation; （4）quantitative estimate of the contribution of sandstone rebound to hydrocarbon accumulation.

关 键 词：砂体回弹 油气成藏机理 低压油气藏 地层剥蚀 

分 类 号：TE122.3[石油与天然气工程—油气勘探]