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刘国民，郝振宪，张鲁惠．利用非线性模型求储层孔隙度的多因素计算公式．测井技术，１９９９，２３（４）：２７３～２７５孔隙水中的束缚水占的是无效孔隙，它与所测的地层电阻率有关。为此，在用声波时差计算孔隙度的公式中引入了Ｒｔ，得到了声波时差、电阻率和孔隙度的经验关系式。统计的相关系数高达０．９８６，平均孔隙度的绝对误差仅为０．５９％。此多因素公式在储层埋深相差很大，孔隙度变化范围也相当大的文留油田应用，大大提高了所计算的孔隙度值的可信度和准确性。
Liu Guomin, Hao Zhenxian, Zhang Hui. Multi - factor Calculation Formula for Calculating Reservoir Porosity with Nonlinear Model. Logging Technology, 1999,23 (4): 273 ~ 275 The irreducible water in pore water accounts for invalid pores, which is related to the measured resistivity of the formation. For this reason, Rt was introduced into the formula for calculating porosity by acoustic jet lag, and the empirical relationship of acoustic jet lag, resistivity and porosity was obtained. The statistical correlation coefficient is as high as 0.986, and the absolute error of average porosity is only 0.59%. The multi-factor formula has great difference in reservoir depth and the application of Wenliu Oilfield, which also has a wide range of porosity, greatly improves the credibility and accuracy of the calculated porosity values.