阿尔奇公式与储层孔隙结构的关系

RELATIONS BETWEEN ARCHIE'S FORMULA AND RESERVOIR PORE STRUCTURE

李秋实 周荣安 张金功 吴汉宁 李学森

Li Qiushi Zhou Rongan Zhang Jingong Wu Hannin Li Xuesen

通过对陕141井区上古生界山2储层的毛管压力曲线和岩电实验资料的研究,认为阿尔奇公式中的电阻率因素不但与储层孔隙度、孔隙的曲折度有关,而且与储层的孔喉比有关,当孔隙度一定时,孔喉比越小,值越低;地层电阻率指数n值的大小主要受储层孔喉比的影响,当储层为孔喉比等于 1的管状孔时,等于1,值最小。孔喉比越大,值越大。其原理是当孔隙饱含油时,不仅导电体截面减小,而且导电体长度增加。

It is discovered by the experimental study on Shan-2 Paleozoic reservoir of Shan-141 well area that the resistivity factor F in Archie's Formula is not only related with the porosity and tortuousity of the pore but also related with the throat of the pore as well. When the throat rate =1, the minimum of n is 1, when the throat becomes larger, n becomes larger accordingly. It is concluded that the smaller the ratio of the pore throat,the lower the Value F is. The size of Value n of the reservoir resistivity index is chiefly effected by the ratio of the pore throat.The theory is that when the pore is full of oil, the layer of the conductor decreases and the length of it increases.

10.11743/ogg20020413