姬塬延安组储层水驱油效率及影响因素

DISPLACING EFFICIENCY AND AFFECTING FACTORS OF RESERVOIRS IN YAN'AN FORMATION, JIYUAN REGION

孙卫 何娟

Sun Wei He Juan

应用真实砂岩微观模型对樊家川、元城油田侏罗系延9、延10油层两相驱替过程进行了观察、研究。实验结果表明：研究区微观砂岩模型无水期驱油效率低;驱油效率与注入水入口压力成反比,而与渗透率成正比;樊中区驱油效率为三个区块中最高的,延9-2为延9油层组三个小层中驱油效率最高的;影响驱油效率的主要因素是驱替压力、渗透率、孔隙结构非均质性和视孔喉体积比。

Based on the true micromodels of sandstone,the twophase displacing process of oil by water of the Jurassic Y-9 and Y-10 oil reservoirs in Fanjiachuan-Yuancheng oilfields was observed.The results show that the displacing efficiency was in inverse proportion to the entering pressure and direct proportion to permeability.The displacing efficiency of Fanzhong area and Y-9～Y-2 substratum were the best among the three zones and the three substratums of Y-9 reservoirs respectively.The main factors that affecting the displacing efficiency are drive pressure,permeability,the microheterogeneity of pore structure and apparent porethroat volume ratio.

10.11743/ogg19990106