低渗透油藏中微电极曲线的应用

Application of Micro-electrode Log Curves in the Low Permeability Reservoirs

针对微电极曲线的负差异现象在低渗透油藏中的普遍情况 ,从微电极测量原理入手 ,结合低渗透油藏的其它曲线特征与孔隙结构差异 ,对微电极曲线的负差异现象进行了解释 ,认为原因是储层的渗透性差、泥浆的侵入非常弱以及没有形成泥饼等现象造成的 ;结合岩心实验资料和试油资料 ,将微电极负差异现象应用于低渗透油藏的物性下限研究和油干层的判别中 ,取得了良好的效果。

Abnormal negative separations of micro-electrode log curves are very vommon in the low permeability reservoir. According to micro-electrode log principle and separations between other log curves and pore structures in the reservoirs, explained are the separations of the micro-electrode curves, from which we saw that causes resulting in the separations are poor reservoir permeability, weak mud invasion and no mudcake formation. Combining with core test data and oil test data, the separations are used for studging lower limits of physical properties of the reservoirs as well as for identifying dry oil beds, which shows a better log result.