安塞油田王窑区储层压力敏感性研究

描述了安塞油田王窑区特低渗储层孔隙结构特征,在对25块岩心作了渗透率与有效压力实验的基 础上,分别对渗透率对有效压力的敏感性,渗透率的滞后和渗透率的大小与有效压力的敏感性关系进行了 研究。研究认为,存在层理缝或微裂缝时,渗透率在低有效压力下变化特别明显,岩心在净围压的重复变 化过程中均具有一定的塑性;对储层进行评价时,应考虑有效压力和气体滑脱效应的影响;注水开发时,应 考虑微裂缝的影响。

A study on pressure sensitivity of reservoirs in Wangyao block of Ansai oilfield

This paper describes the characteristics of pore structures of the ultra - low permeability reservoirs in Wan-gyao block, Ansai oilfield. It studies sensitivity of permeability to effective pressure and sensitivity of permeability hysteresis and value to effective pressure based on permeability and effective pressure experiments of 25 cores. Study shows that permeability changes greatly at low effective pressure and all cores have certain plasticity during repeated change when bedding fissures or microfissures exist Influences of effective pressure and gas slippage effect should be taken into consideration when evaluating reservoirs. Influences of microfissures should be taken into consideration during waterflooding.