不同运移方式下断裂控藏作用的差异性——以松辽盆地升西—徐家围子向斜区葡萄花油层和杏北地区扶余油层为例

Differences in fault control of oil accumulation in different migration forms——an example from P oil layer of Shengxi—Xujiaweizi Synclinal region and F oil layer of Xingbei region

为研究断裂在油气成藏与分布中的作用,在松辽盆地升西—徐家围子向斜区葡萄花油层和杏北地区扶余油层断裂发育及分布特征研究的基础上,采用断裂输导、封闭与油气分布之间关系分析方法,研究升西—徐家围子向斜区葡萄花油层和杏北地区扶余油层断裂控藏作用的差异性.结果表明:由于油运移方式不同,2个地区断裂输导油和聚集油作用存在差异性,升西—徐家围子向斜区断裂对葡萄花油层油运移起垂向输导作用,杏北地区断裂对扶余油层油运移起侧向连接输导作用;升西—徐家围子向斜区葡萄花油层油主要聚集在油源断裂上盘,即断裂密集带内,杏北地区扶余油层油主要聚集在反向断裂的下盘,即断裂密集带两侧,且反向断裂断距越大,越有利于油聚集.该研究结果对认识松辽盆地凹陷区下生上储式和源外隆起区上生下储式油气成藏规律和指导油气勘探具有参考意义.

To study the role of faults played in oil-gas accumulation and distribution,based on development and distribution of faults of P oil layer in Shengxi-Xujiaweizi synclinal region and that of F oil layer in Xingbei region,the differences in fault control of oil accumulation between P oil layer in Shengxi-Xujiaweizi synclinal region and F oil layer in Xingbei region were studied by the method of analyzing relation between transporting and sealing of faults and oil distribution.The result indicates that there is a difference of transporting oil of faults in two regions because of different oil-gas migration forms.Faults play vertical oil transporting role in oil migration of P oil layer in Shengxi-Xujiaweizi synclinal region.Faults play lateral counting transporting oil role in oil migration of F oil layer in Xingbei region.There is a difference of accumulating oil of faults in two regions because of different oil migration forms.Oil accumulates mainly in upper blocks of faults counted source rock or in insides of fault condensed zones of P oil layer in Shengxi-Xujiaweizi synclinal region,oil accumulates mainly in lower blocks of transiod faults or in two sides of fault condensed zones of F oil layer in Xingbei region.The bigger the fault distance of transoid faults is,the more abundant the oil accumulation is.