| Llanos Basin is Located in the eastern of Colombia,which in the intersection of the Caribbean plate,the South America plate and the Nazca plate.Tectonic movements of the times is complicated and tectonic deformation is intence.the basin has been done some work,but the work foucused on Qualitative aspects of Basic geological,Lacking of a systematic study of the structural characteristics.Used Gravity and magnetic data,combined with result of Geology and Seismology,dealed with the Gravity data of retroarc foreland basin in Llanos Basin,analyzed Vertical second derivative,Horizontal directional derivative,Analytical continuation.Analysed the related basic maps.in addition,used Semi- human-computer interconnect for second degree program to give a Integrated interpretation for Gravity anomaly.Through the analysis of the Feature of the Gravity anomalies and the Quantitative interpretation of the profiles.speculated the type and direction of fracture in the study area,Established tectonic framework of Colombia Llanos basin.It is suggested that the fracture controlled the pattern of uplifts and the distribution of Mesozoic and Cenozoic in Llanos basin.Studied the distribution and extension of NNE-trending echelon break and EW-trending faults developed in the research area,calculated the thickness of Cenozoic and Mesozoic and the depth of the basement.Llanos basin is divided in to four tectonic units,which are the northwest thrust fold zone, the southwest shield uplift zone, the central depression zone and the eastern front uplift zone.Provided the Geophysics basis for the further research of exploration and geology in study area,It is a Significance to explorate on overseas oil and gas geophysical. |
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