稠油油藏水淹层实例研究

Case Study of Watered-out Layer in Heavy Oil Reservoir

弱胶结储层在开发后,其孔隙结构与岩性发生变化,用于计算饱和度的Archie公式已不适用。为了识别注水稠油油藏的水淹层,对N油田2010年以后完钻的320口采油井的测井曲线开展测井响应研究:综合使用自然电位(SP)泥岩基线偏移、强水淹段储层的SP幅度变小,新井的深电阻率比老井的明显降低,以及2次脉冲中子-中子(PNN)测井的热中子衰减时间(TNDT)的明显幅度差等识别水淹层;利用老井/新井的深电阻率比值,结合周边注入水/边水供应情况定性判别水淹程度。

After the development of weak cementation reservoir,its pore structure and lithology will change,and the Archie formula for calculating saturation is no longer applicable.In order to identify the water-flooded layer of water-injected heavy reservoir,the logging response research of logging curve of 320 production Wells drilled after 2010 in N Oilfield is carried out.The methods including Self-potential(SP)mudstone baseline migration,SP amplitude of strong water-flooded Reservoir decrease,significant decrease of new well's deep resistivity compared with the old one,and thermal neutron decay time(TNDT)amplitude difference of 2 pulsed neutron-neutron(PNN)logging are used to identify water-flooded layer.The depth resistivity ratio of the old well and the new well is used to qualitatively determine the flooding degree in combination with the peripheral injected water/edge water supply.