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An Investigation of Deep Electrical Structure of Qiangtang Basin,xizang(Tibet),china

Journal of Earth Science 1995年第2期14卷 92-96页

作者： zhang shengye wei sheng wang jiayingdepartment of applied geophysics, china university of geosciences, {2. 430074zhang xianjue5th geophysical prospecting team of central south Bureau of petroleum geology ,{12., x

In order to study the deep geoelectrical structure and the regional geological structure and detect potential oil and gas areas in Qiangtang basin in northern xizang (Tibet ), 2.2.MT soundings were conducted along three N - S MT profiles across the basin .the MT results indicate that the south and north parts of the Qiangtang basin have a good contrast in the deep electri cal structure . In the south Qiangtang , there are generally two high conductivity layers in the crust . the first is at a depth of about 10 - 2. km and possesses a resistivity of about 10 - 80 Ωm .the second ,the high conductivity layer in the lower crust ,is at a depth of about 40 - 70 km with 3 - 50 Ωm .In the north Qiangtang .there is generally one high conductivity layer .It is at a depth of about 10 - 30 km and the resistivity is about 1-60 Ωm . the thickness of the second high conductivity layer in both the south Qiangtang and the Bangong-Nujiang suture is much greater than that of the first .the thickness of the lithosphere is about 110-12. km for the Bangong-Nujiang suture ,115 km for the south Qiangtang and 100-130 km for the north Qiangtang . On the difference of the deep electrical structures of the crust between the south and the north Qiangtang , we believe that it is related to the eastward flow of the crustal substance .

关键词： MT profile Qiangtang basin deep electrical structure crust and upper man-tle high conductivity layer .

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