单井岩电资料在含水饱和度模型研究中的应用

Use of litho-electric data of single well in water saturation model

阿尔奇公式中岩电参数的准确性决定了储集层含水饱和度模型的精度。岩电参数一般通过常压条件下的岩电实验分析求取.而理论上覆压条件下岩电实验得到的参数更准确。为了分析两种实验条件对饱和度模型的影响.研究了大港地区风化店油田单井岩心两种实验条件的岩电数据.结果表明压力对岩性系数b、饱和度指数n值影响较大,对岩性系数a、胶结指数m值影响不明显。结合多井试油结果分析得出,两种实验条件所确定的饱和度模型误差均在储量规范合理范围内.且均能准确进行储集层流体识别,进一步验证了该区经验含水饱和度模型的准确性。研究认为在油田开发中.采用常压岩电实验足以满足油田开发中油气层识别的需要;在油藏量化规模研究中.更宜采用覆压岩电实验.以确保饱和度值的高精度。

In Archie equation,the accuracy of litho-electric parameters determines the accuracy of reservoir water saturation model.Litho-electric parameters are generally obtained by litho-electric experimental analysis under atmospheric pressure,while theoretical parameters of litho-electric experiments in net confining stress are more accurate.To analyze the effects of two experimental conditions on saturation model,litho-electronic data under two experimental conditions for single well core from Fenghuadian oilfield in Dagang area was studied,the results showed that the pressure had a greater impact on lithology coefficient b,n saturation index value and made no obvious impact on lithology factor and cementation exponent m.Combined with the analysis on multi-well oil test results,the author concluded that the saturation model errors determined by the two experimental conditions were within a reasonable range of the reserves,could accurately perform reservoir fluid identification,and validated the accuracy of emperical water saturation model of the area.Studies showed that using litho-electric experiments with atmospheric pressure is enough to meet the needs of identifying oil and gas layers in oil field development,in the studies on reservoir quantization scale,litho-electric experiment in net confining stress should be adopted to ensure the precision of the saturation value.