黄土地区油气晕遥感成像机理初探

为揭示黄土地区TM图像上油气晕环成像机理，分析了试验5个环形影象1个已知油气显示环形影象的地表土壤光谱与油气地球化学指标的相关关系。同时，分析TM图像上该5个环形影像内外亮度变化规律，并与已知油气显示环比较，得出以下结论：（1）虽然6个环的地表土壤的单波段光谱与单个油气地球化学指标（含水量除外）之间无显著相关，但典型相关分析结果表明，各环的地表土壤光谱与油气地球化学指标却有显著的典型相关关系。（2）每个环形影象内、外TM亮度变化规律与已知油气显示环内外亮度变化规律的相似怀，和它们的油气地球化学元素的共生组合及元素在环内外差异特征的相似性基本一致。上述结果表明，TM图像上油气晕环是油气晕地球化学元素的共生组合及元素在环内外差异特征的反映。

Study of Remote Sensing Imagery-mechenism for Oil-gas Halo on Loess Region

Oil-gas anomalies in soil is usually characterized on Landsat remote sensing image as the form of annular features in the loess region. But the problem is that not all the annular features denote oil-gas anomalies. In order to develop the imagery-mechenism for oil-gas halo on TM image, the relationship between spectral reflectance of TM bands and oil-gas halo geochemical parameters of surface soil for five interested annular features and a known oil-gas halo annular feature in experimental area have been analysed. In the meantime, the brightness level difference between inner and outer the above six annular features on TM image were analysed. By comparision the five interested annular features with known oil-gas halo annular feature, the following results are found, (1) Though there is no significantly correlation between the soil spectra of each TM band and single geochemical parameter (except moisture content) for the five interested annular features and annular feature of known oil-gas halo, the canonical correlation analysis shows that the soil spectrum variants are significantly correlated to variants of oil-gas halo geochemical parameters for each annular feature, respectively. (2) It is almost coincidence that two similar sequences are compared with the known oil-gas annular feature in the changing regulation of TM brightness level between inner and outer for each interested annular feature and in the paragenetic composition and difference between inner and outer the ring characterist of oil-gas halo geochemical parameters for each interested annular feature, respectively.The above results show that the oil-gas annular feature on TM image present the paragenic composition characterist of oil-gas halo geochemical parameters. There are useful selecting the annular feature corresponding to oil-gas halo on TM image.