三个泉凸起西部侏罗系头屯河组油藏成因

从准噶尔盆地区域构造研究入手,探讨了历次构造运动对三个泉凸起西部侏罗系沉积的影响后指出,燕山运动晚期三个泉凸起进一步抬升,使上侏罗统乃至下白垩统下部在凸起和断裂带南部遭受不同程度的剥蚀,而断裂北部下降盘仍保留部分上侏罗统和下白垩统;三个泉凸起西部油藏与中、东部油藏具有不同成藏条件,其油源来自于玛湖凹陷和盆1井西凹陷,油气沿夏盐凸起阶梯状断裂与不整合面运移成藏;陆151井区侏罗系头屯河组储集层直接与断层上升盘陆12井区西山窑组油藏呈断层面接触而接受油气,属于构造岩性控制的小型油藏。

Genesis of Toutunhe Reservoir of Jurassic in Western Sangequan Swell,Junggar Basin

High-yielding commercial oil flow is found from Lu-151 Well in western Sangequan swell of Junggar basin.In view of its reservoir sequence classification,starting with study of the basinal regional structures,the influences of all tectonic movements on the Jurassic deposits in western Sangequan swell are discussed.It is suggested that in late Yanshan movement the swell was in lifting,which allowed the Upper Jurassic and the bottom of the Lower Cretaceous in swell position and southern fault zone to be denudated and corroded,while in northern fault zone(downthrow side) partial Upper Jurassic and Lower Cretaceous still remained;there existed different conditions of petroleum accumulation for west reservoir and east reservoir of Sangequan swell,their oil sources were originated from Mahu sag and Well Pen-1 west sag,and the reservoir was formed by petroleum migrating along ladder-like fault and unconformity of Xiayan swell;the reservoir of Lu-151 Wellblock belongs to Toutunhe formation of Jurassic,it is directly contacted with Xishanyao reservoir of Lu-12 Wellblock(upthrow side) by way of fault plane and charged,belonging to small-scale oil reservoir controlled by structure and lithology.