马东地区低阻油层成因分析

CAUSE ANALYSIS OF LOW-RESISTIVITY RESERVOIR IN MADONG AREA

马东地区具有优越的成藏背景，近年来针对东二段油层进行老井试油获得成功，但对其形成低电阻的影响因素没有进行整体分析。本次工作在综合分析马东地区地质情况、试油、试采及化验资料的基础上，分析并总结了该区形成低阻油层原因主要是储层岩石颗粒细导致的高束缚水饱和度、薄油层围岩影响、成水泥浆侵入影响。通过多因素分析制定了该区低阻油层电性标准，指导了该区的老井复查，取得明显效果。为研究岩性因素及成水泥浆引起的低电阻油气层的解释方法、提高油气层的解释符合率奠定了良好的基础。

There is an advantageous background of forming hydrocarbon reservoirs in Madong area.In recent years testing for oil has been successful in old wells of Dong 2 section.But the influencing factors of low-resistivity reservoir has nat been analyzed integrately.On the basis of com- prehensive analysis of geological condition,testing for oil,test production and chemical examination data in Madong area,the cause of forming low resistivity reservoir is primarily high bound water saturation resulted from fine rock grains,shoulderbed effect of thin oil layers and saline mud invasion.Through multiple factor analysis,the electrical property standards of low resistivity reservoirs in the area have been worked out to guide resurvey of old wells in the area.It has obtained positive effect.The method has laid a good foundation for the research of interpretation method of low-resistivily reservoirs caused by lithological factors and saline mud and improvment of the interpretation co- incidence rate of hydrocarbon reservoir.