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大地电磁测深数据包含TE和TM极化模式信息。在二维地层结构条件下,这两种极化模式获得的ρ_(xy)、ρ_(yx)视电阻率曲线特征及相互关系与地下电性结构有关。当低阻体或断裂等地质构造存在时,两种曲线存在明显的组合规律。在探测深大断裂工作中,综合利用两种模式的视电阻率曲线及其组合规律信息,可以排除浅部低阻体的影响,确定隐伏断裂的位置。本文研究了浅部低阻体和断裂地层结构模型的ρ_(xy)、ρ_(yx)视电阻率曲线特征及变化规律,并将其用于深大断裂处的实测大地电磁测深资料的解释,地质效果较好。理论研究和实例验证说明利用ρ_(xy)、ρ_(yx)视电阻率曲线的特征可以为大地电磁测深资料解释提供有效的参考信息。
Magnetometry data contains TE and TM polarization mode information. Under the condition of two-dimensional stratigraphic structure, the characteristics and correlations of ρ_ (xy) and ρ_ (yx) apparent resistivity curves obtained by these two polarization modes are related to the structure of the underground electricity. When the geological structure such as low resistivity body or fault exists, there is obvious combination law of the two kinds of curves. In the exploration of deep faults, comprehensively utilizing the apparent resistivity curves and their combination rules of the two modes, we can rule out the influence of shallow resistivity and determine the location of buried faults. In this paper, the characteristics and variations of the ρ_ (xy) and ρ_ (yx) apparent resistivity curves of the low-resistivity body and fracture strata model are studied and applied to the interpretation of the measured data from deep electromagnetic surveys Geological effect is better. Theoretical studies and case studies demonstrate that using the characteristics of the ρ_ (xy) and ρ_ (yx) apparent resistivity curves can provide effective reference information for the interpretation of the data of the magnetotelluric data.