2008•Unpublished venueRequires access
Study on Basin-Mountain Coupling in East Segment of Southern Margin and Northeastern Margin of Junggar Basin
LU Miao-an
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Abstract
The eastern Junggar basin is in multi-units and complex deformed framework and has basin-mountain relationship among eastern Junggar basin, Bogda mountain, Karameli mountain and mountains of northeastern margin of Junggar basin. This paper presents their dynamic relationships, develops their basin-mountain coupling models and predicts their favorable zones for petroleum migration and accumulation. It is recognized that 1)there exists one east-west trending compressional and nappe structural system in Changji-eastern Junggar basin, which undergone long-term activities from Late Carboniferous to Mesozoic and Cenozoic; 2)the eastern Junggar basin and its nearby mountains are composed of three tectonic systems which began to take shape at different periods and underwent continuous or discontinuous activities, they are the Caledonian-Hercynian NW trending tectonic belt, the EW trending nappe structure developed from Late Carboniferous to Mesozoic and Cenozoic, and the Cenozoic Bogda mountain-eastern Junggar basin-Karameli mountain nappe structure. These tectonic systems occurring and developing in different times or overlapping during their development form complex basin-mountain coupling in these areas; 3)the fault bend fold, fault propagation fold and imbricate thrust faults are the main types of structural deformation in eastern Junggar basin and Wulungu region, in the complex area the tear faults and the transfer structures also occurred. In addition, 10 favorable areas for petroleum migration and accumulation are provided in this paper besides the models of basin-mountain coupling among eastern Junggar basin and its marginal mountains.