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南八仙油气田为轻质油气层 ,泥浆侵入影响很大。泥浆侵入深度与泥饼形成过程中泥浆滤液渗入地层的数量有关 ;泥浆滤液的渗入量与泥浆特性有关 ,也与泥浆柱压力和地层压力之差及钻井后至测井时的时间间隔有关。当泥浆矿化度低于地层水矿化度时 ,油气层与水层的径向侵入剖面电性有明显差别 ,各种测井响应都有相应的特征。利用时间推移测井找出泥浆浸泡时间对油气层双感应、双侧向测井浸入规律 ,为准确确定含油饱和度、减小泥浆侵入的影响有着很重要的作用。
Nanbaixian oil and gas field is a light oil and gas layer, mud invasion has a great impact. The depth of mud invasion is related to the amount of mud filtrate infiltrating into the formation in the process of mud cake formation. The amount of mud filtrate infiltration is related to the mud characteristics and the difference between mud column pressure and formation pressure and the time interval from drilling to well logging. When the mud salinity is lower than the salinity of formation water, there is a significant difference in the electrical properties of the radial intrusive profiles between the hydrocarbon and water layers, and all log responses have corresponding characteristics. The use of time-lapse logging to find out the double-induction and double-lateral logging infiltration rules of mud immersion time in oil and gas reservoir plays an important role in accurately determining the oil saturation and reducing the influence of mud invasion.