冲洗带

径向侵入剖面模型由冲洗带、原状地层和从冲洗带到原状地层的过渡带3部分组成。

The radial invasion profile model is made of flushed zone , undisturbed zone and transition zone .

该侵入剖面模型较传统的仅由冲洗带和原状地层构成的台阶状侵入剖面模型更加接近地层径向侵入剖面的真实情况。

Comparing to the traditional step model which only comprises flushed zone and undisturbed zone , this new model is more closer to the real situation .

这将有助于用阿尔奇公式准确地评价低孔隙度低渗透率地层的含油气饱和度和冲洗带残余油气饱和度。

These results are conducive to evaluation of the oil saturation in low porous and permeable formation and residual oil saturation in the flushed zones with Archie equation .

应用所得理论结果，对裸眼井井壁的面电荷分布和地层冲洗带内的体电荷分布情况作了初步的探讨。

A preliminary discussion is made on surface charge distribution on the borehole wall and volume charge distribution in the flushed zone in a borehole by using the theoretical results .

侵入作用将会改变储集层电阻率的径向特征，同时在井壁处形成环状的泥饼，使地层沿径向形成了冲洗带、侵入带和原始地层带。

The invading effect will alter the radial direction of the reservoir resistivity , in the meanwhile it forms a circular mud cake in the wall of hole and flush zone 、 invaded zone and original layer along the radial of the layer .

建立了侵入过渡带地层模型，该模型把径向地层分为井眼、冲洗带、过渡带和原状地层，其中过渡带的电阻率线性变化，可以较好地描述真实侵入过程的特性。

A four-parameter invaded transitional zone model is established , and in the model , formation is radially divided into four parts of borehole , flushed zone , transitional zone and original formation . The linear variation of the resistivity of the transitional zone realistically describes invasion process .

用修正阻尼最小二乘法对模型中的冲洗带电阻率、原状地层电阻率、冲洗带半径和过渡带半径4个参数进行了反演计算。

Four parameters ( the resistivity of original formation , resistivity of transitional zone , the radius of flushed zone and the radius of transitional zone ) are inverted by using modified damped least square method .