三塘湖盆地条3井稠油形成条件分析

方法从盆地构造发育史和沉积演化特征入手，运用层序地层学和油气藏动态分析的方法，对条3井稠油的烃源岩、油气运移通道等进行了分析和探讨。目的分析三塘湖盆地条3井稠油的形成条件，为盆地今后的油气勘探指明方向。结果三塘湖盆地条3井稠油来自盆地东部的二叠系烃源岩；区域不整合面和逆冲断裂系统为油气提供了良好的运移通道；早期及同期形成的圈闭是油气聚集的有利场所；晚期较弱的构造活动为油气保存创造了有利条件。结论三塘湖盆地目前勘探的方向，一是衣盆地东部二叠系烃源岩沉积中心与条3井间的运移通道附近；二是在盆地南部与条3井北断层相当的逆冲（掩）断层下盘。

Geneses analysis of heavy oil in well T3 in Santanghu basin

Method Based on the history of structural development and the evolution characteristics of sedimentary sequences,this paper discusses hydrocarbon source rock,migration pathway of heavy oil and gas in well T3 by means of sequence stratigraphy and reservoir dynamic analysis. Purpose To analyze the geneses of heavy oil in well T3 in Santanghu basin and to guide oil and gas exploration of this basin for the future. Result Heavy oil of well T3 in Santanghu basin came from Permian hydrocarbon source rock in the east of the basin;regional unconformity surface and thrust faulting system provides good migration pathway for oil and gas;the traps formed earlier and in the same time is good for petroleum accumulation; weak tectonic movement in the late period was good for preservation of petroleum. Conclusion One of the exploration targets in Santanghu basin at present is in the vicinity of migration pathway between sedimentary center of Permian hydrocarbon source rock in the east of the basin and the well T3;the other is in the lower block of thrust(overthrust) fault similar to the north fault of T3 in the south of the basin.