油田开发过程中的动电现象研究

Electrokinetic phenomena in oilfield development

动电现象是油气田注水开发过程中因油藏环境变化而引起的一种特殊的地球物理现象.本文依据多孔介质中的双电层模型及动电理论,对油气田开发过程中的动电现象进行研究,提出陆相非均质复杂构造油气藏开发过程中压力异常、地层水淡化及多相流动是动电现象产生的主要原因,流动电流的形成不仅使老区新钻井的自然电位曲线发生畸变,表现为平直及正异常现象,还导致水淹层的电阻率升高,严重干扰已动用层的评价工作.

Flowing through micro-channel, the fluid streaming potential is strongly influenced by the pressure imposed on the two ends of micro-channel and electrolyte concentration. Theory-based of electric double layer and electrokinetic, this paper states the main factors causing electrokinetic phenomenon are abnormal pressure and salinity decrease and multiphase flow in oil field development, and investigates the positive and negative changes of self-potential which is the expression of the streaming potential, and high resistivity of waterflooded zone.