倾子在地下介质横向边界识别中的数值模拟研究

Modeling study on the tipper for the identification of transverse boundary

倾子资料能够反映地下介质的横向不均匀特征,但是长期以来在实际应用方面研究程度不高.笔者将倾子作为一个单独可直接应用分析的参数进行研究,建立了岩性分界面、断裂和不同电阻率比值的典型模型,并进行二维正演模拟.通过分析倾子响应曲线,借鉴重磁数据处理的思想,对倾子响应曲线求取一阶导数和二阶导数,并分析其结果.通过研究认为将倾子资料求导处理后,能够作为独立参数直观展示地下介质的电阻率横向变化情况和分界面的位置.结合砂岩型铀矿勘查的工作实际,利用二连盆地钻孔数据建立正演模型,并进行了电阻率反演和倾子数值模拟,从理论上证明能够将倾子作为单独的分析参数实际应用于确定目标层砂体的横向边界,同时也为后续对倾子资料投入实际应用方面提供了研究思路.

The tipper data can be utilized to reflect the lateral inhomogeneity of the underground medium,but it remains poorly studied in terms of practical applications.The author studies the tipper as a separate parameter that can be directly applied for analysis,and establishes a typical model of lithology interface,fracture and different resistivity ratios,and performance the twodimensional forward simulation.Reference to gravity and magnetic data processing approach to analyze the tipper response curve,the first and second derivative results are calculated and further analyzed.By studying the lateral change in the resistivity of the underground medium and the position of the interface,it proved that the derivated tripper data could be used as an independent parameter for the measurement of the resistance of the underground medium.Utilizing the acquired borehole log from sandstone-type uranium exploration to setup the model,integrating the resistivity inversion and tripper modelling,theoretically proves the tripper data could be applied as a independent parameter for practical applications to determine the horizontal boundary of the target layer sand body.In the meantime,it also provides a research approach for further deploy tripper data into the practical.