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Characters of geophysical fields and floor of Daqing outer basins

JIANG Wei-wei~1,TU Guang-hong~1,ZHU Dong-ying~1,ZHOU Li-hong~2,XIAO Dun-qing~2,GAO Jia-rui~2,YUAN Shu-qin~2(1.Institute of geology and geophysics Chinese Academy of Sciences,Beijing 100029;2.China Petroleum Dagang Oil Company,Tianjin 300280)  
Based on Bouguer gravity and the aeromagnetic anomalies data of Daqing outer basins,we analyse the characters of geophysical fields of these basins.We apply the Harmonic series method on gravity data that eliminated gravity effect caused by deep construct to inverse the depth of gravity floor.We use the genetic algorithm method on magnetic data that eliminated magnetic effect caused by deep construct to inverse the depth of magnetic top of these basins.Then we make a future analyse to the characters of these floors.The depth of gravity floor is between 0.2 km and 9.0 km,and the depth of magnetic top is between 1.8 km and 9.8 km.This shows the general status of basins.
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