利用测井资料确定粘土矿物的方法对比

Comparison of determination methods for clay minerals using log data

为了准确计算粘土矿物的含量,在缺少自然伽马能谱资料的情况下,利用自然伽马、中子、密度、声波组合参数,通过多元回归建立了计算粘土矿物的三孔隙度模型,同时利用三孔隙度模型、阳离子交换能力与含氢指数比值(CEC/IH)和自然伽马能谱资料3种计算粘土矿物含量的方法对A油田3口井的资料进行了处理,并对处理结果作了对比分析。结果表明,在缺少自然伽马能谱资料的情况下,可以利用自然伽马、中子、密度、声波测井资料,通过多元回归计算粘土矿物含量;与岩心资料相比,CEC/IH处理结果较差,三孔隙度模型的计算精度略高于自然伽马能谱资料的分析结果;相对于CEC/IH交会分析和自然伽马能谱分析,三孔隙度方法简单、可靠,且适用范围较广。

In order to accurately calculate the clay minerals contents, a three-porosity calculation model of clay minerals contents without gamma spectrum data was presented based on the multiple regression of natural gamma, neutron, density, acoustic well log data. Well log data from three wells in A Oilfield were processed by the three-porosity model and other two traditional methods proposed respectively based on ratio of cation exchange capability and hydrogen index （CEC/ⅠH ） and gamma spectrum data, and the results were compared. The results indicate that under the condition of lacking gamma spectrum data, the clay minerals contents can be calculated based on the multiple regression of the natural gamma, neutron, density, acoustic well log data. Compared with the core analysis results, the error based on CEC/ⅠH is the greatest, and the reliability based on three-poroslty model is a litte higher than that of the method based on gamma spectrum. The three-porosity method is easy to apply and its applicability is wider than that of the CEC/ⅠH and natural gamma spectrum analysis.