The types and genetic mechanism of intensively faulted zones in the Fuyu oil layer in the Songliao Basin were studied based on 3D seismic data and combined with the plane and profile characteristics of intensively faulted zones, so as to identify the controls of intensively faulted zones on hydrocarbon migration and accumulation.Reservoir dissecting technology was applied, and the distribution characteristics of intensively faulted zones, hydrocarbon and sand bodies were taken into consideration.Several conclusions were made as follows.(1) Intensively faulted zones are widely distributed in the Fuyu oil layer in Xingbei area, including the parallel graben belts caused by stretching and the hybrid intensively faulted zones caused by coupling.(2) Sheltered by transverse intensively faulted zones, the ramp zones to the south and east of the central anticline have no oil or gas enrichment.Hydrocarbon was enriched in the hanging wall of boundary reverse faults outside intensively faulted zones.The larger the scale of fault displacement, the higher the degree of oil enrichment.(3) The boundary faults of consequent intensively faulted zones can be hydrocarbon migration pathways along the fault strike.Tectonic inversion occurred in the central anticline zone, and the "uplifted graben" morphology formed in intensively faulted zones, where oil and gas accumulated.%为了明确断裂密集带在油气运聚成藏中的控制作用,选取松辽盆地杏北扶余油层断裂密集带为研究对象,以三维地震为基础,结合断裂密集带平面、剖面特征,总结杏北地区扶余油层断裂密集带分布特征及成因机制.同时,利用油藏解剖技术,结合断裂密集带分布特征、油气分布规律及砂体分布特征,对断裂密集带在油气运聚成藏中的控制作用进行了分析,研究结果表明:(1)杏北地区扶余油层断裂密集带广泛分布,主要包括伸展成因机制的平行地堑带和耦合成因机制的混合式密集带;(2)横向断裂密集带的遮挡作用导致中央背斜带南部和东部缓坡带无油气富集,断裂密集带外油气主要富集在密集带边界反向断裂上盘,反向断裂断距规模越大,油气富集程度越高;(3)顺向断裂密集带边界断裂可以作为油气沿断裂走向运移的通道,受构造反转作用影响,中央背斜带发育的断裂密集带内部形成"堑中隆"构造,断裂密集带内部油气主要富集在"堑中隆"构造发育部位.
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