下扬子北部地区电性参数分析

The analysis of the electric parameters in the Northern Xiayangzi

华东石油地质局第六物探大队, 南京210009

The 6th Geophysical Exploration Party, MGMR, Nanjian 210009

本文对下扬子北部地区直流电测井、露头大地电磁测深资料和大地电磁井旁测深、露头测定等资料进行了统计与分析,并对苏北盆地具有代表性的钻井,进行了系统分析,特别是对所做的井旁测深成果作了对比。根据这些资料所显示的各电性层的岩性特征及电阻率数值的变化情况,对下扬子北部地区电性特征做了归纳分层,从新生界到太古界划分出十大电性层,阐述了印支侵蚀面电性变化特征,以及浅变质基底、壳内高导层等的电性结构特征。

The statistics and analysis is made of the data of dc-log, outcrop telluric electromagneticsounding, telluric electromagnetic near-well sounding and outcrop surveying in the NouthernXiayangzi. Drillings representative of Subei Basin are systematically analyzed and the results of thenear-well sounding are especially compared. According to the lithological features and variations ofresistivity displayed from the data, the electrical properties of the Northern Xiayangzi isstratigraphically generalized into 10 major electric stratum from Genozoic group to Archaeangruop, and the varintions of electric property on the Indo-China erosion surface, electricallystructural features of the epizonal basement,the high conductivity formation et al are all describedin this paper.