摘要
毛管压力曲线表征了储层岩石孔喉大小和分布 ,对于孔隙性储层而言 ,岩石绝对渗透率主要取决于孔喉分布。通过对来自吐哈、辽河、胜利、四川德阳新场气田等油气田不同砂岩储层岩样 393个和陕甘宁中部气田及加拿大等地区的碳酸盐岩储层岩样 2 5 7个的压汞毛管压力数据的研究发现 ,双对数坐标下储层岩石毛管压力曲线呈明显的双曲线特征 ,且可用双曲线的两条渐近线 pd 和Sb 及孔喉几何因子 (Fg)三个参数唯一确定 ,双曲线的顶点代表了非润湿相在岩石系统中完全占据能有效控制流体流动的那部分有效孔隙空间时的状态 ;双曲线的位置形状参数或顶点参数决定了岩石绝对渗透率的大小。文中分别用位置形状参数和顶点参数成功建立了砂岩储层和孔隙性碳酸盐岩储层的岩石绝对渗透率估算模型 。
The pore throat size and distribution of reservoir rock may be characterized by capillary pressure curve.In regard to porous reservoir,rock absolute permeability is mainly depended on the distribution of pore throats.Through analyzing the mercury injection capillary pressure data on 393 sandstone samples collected from Tuha Oil Field,Liaohe Oil Field and Shengli Oil Field as well as the Xinchang gas field in Deyang,Sichuan,and on 257 carbonate rock samples from the Middle gas field in Shaanganning Basin and from Canada,it is found that the capillary pressure curve of reservoir rock shows a distinct hyperbola under log-log coordinate,being only determined by three parameters,i.e. P d, S b and pore throat geometrical factor ( F g);the apex of hyperbola represents such a state while the effective pore volume controlling fluid flow has been completely occupied by non-wetting phase in rock system;and the magnitude of reservoir rock absolute permeability can be determined by the position-shape parameter or apex parameter of the hyperbola.The rock absolute permeability estimating models for sandstone reservoir rock nd porous carbonate reservoir rock are successfully established by use of the position-shape parameter and the apex parameter respectively in the paper,and their reliability is verified by a great number of measured data.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2001年第4期45-48,共4页
Natural Gas Industry
基金
'油气藏地质及开发工程国家重点实验室'开放基金资助项目PLN9730
原地矿部'沉积盆地与流体动力学开放研究实验室'开放基金资助项目
