摘要
在原始地层条件下,储层要承受上覆岩层压力和侧限压力、孔隙压力等的共同影响,这些压力等效成初始有效压力(应力)。在考虑初始有效压力情况下对岩石的应力敏感性的分析表明,储层的物性参数(如孔隙度和渗透率等)仍然随着有效压力的增加而逐渐降低,并满足负指数衰减规律。与不考虑初始有效应力相比,渗透率的降低幅度要小一些,即岩石的应力敏感性要弱一些,但更符合实际地层情况下渗透率的变化规律,因此对指导实际生产更具现实意义。
Reservoirs are influenced by incumbency rock pressure, sideways pressure and porosity pressure at primitive stratum. This stress state is called primitive effective-stress. After the primitive effective-stress be considered, the law of stress sensitivity still follow the negative exponential attenuation. Compare to no consideration of primitive effective-stress, the descend degree of permeability is more little, so the stress sensitivity is weaker. But the law can suit to the fact, and have practical meaning for actual production.
出处
《天然气地球科学》
EI
CAS
CSCD
2004年第6期601-603,共3页
Natural Gas Geoscience
基金
国家重点基础研究发展规划项目子课题"气藏变形介质渗流规律研究"(编号:2001CB209108)资助.
关键词
有效应力
应力敏感性
储层
渗透率
孔隙度
Effective-stress
Stress sensitivity
Reservoir
Permeability
Porosity.