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

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９２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 Y9 and Y10 oil reservoirs in FanjiachuanYuancheng 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 Y9Y2 substratum were the best among the three zones and the three substratums of Y9 reservoirs respectively.The main factors that affecting the displacing efficiency are drive pressure,permeability,the microheterogeneity of pore structure and apparent porethroat volume ratio.\;