TNIS测井资料解释中参数敏感性研究

Research on sensitivity of parameters in logging data interpretation of TNIS

TNIS测井技术作为一种新型的脉冲中子测井技术,以探测未被地层俘获的热中子的方式,可在低矿化度条件下有效识别油水层。TNIS定量计算依附于体积模型公式。针对体积模型中泥质、烃俘获截面参数变化范围较大,不利于在解释中确定准确参数和在解释过程中对实际资料微调参数的问题,采用参数敏感性的方法,进行对各参数的偏导数分析和在实际井当中的应用,取得了不同深度下各参数对含水饱和度的敏感性大小。在理论计算中结合实际数据,分析不同深度下的参数敏感性对确定解释参数和提高解释精度具有指导意义。

As a new type of pulsed neutron logging technology,TNIS logging technology is used to detect the thermal neutron captured by the formation. TNIS to cling to the volume model of quantitative calculation formula for the volume change of argillaceous hydrocarbon capture cross section parameters in the model range is bigger,is not conducive to accurate parameters in the explanation,and the explanation to the actual data in the process of tuning parameters. Using the method of parameter sensitivity analysis of the partial derivative of the various parameters and in practical application of well,the different parameters under different depth of the size of the sensitivity of water saturation. Combined with the actual data in the theoretical calculation,the analysis of the parameters sensitivity at different depths is of guiding significance in determining the parameters and improving the accuracy of interpretation.