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湖底扇是源内油气藏勘探的重要领域。选取松辽盆地西部坡折带重力流为研究对象,利用岩心、测井和地震资料,对大型坳陷湖盆坡折带背景下湖底扇的形成条件、沉积特征、地震响应和分布规律进行研究。湖盆古地形恢复表明,英台地区为坡折带背景,坡折带是重力流卸载的重要场所,同沉积断裂运动、地震活动、火山喷发为重力流的形成提供了触发机制。湖底扇主要由砂质碎屑流、滑动岩和滑塌岩等块体搬运体组成,浊积岩极为少见。湖底扇具有敏感的地震响应特征,剖面上为透镜状,内部振幅和频率变化较大。湖底扇主要分布在四级旋回的基准面上升期,平面上在扇三角洲前缘外侧连片分布,油气成藏条件优越,是岩性油气藏勘探的有利目标。
The sublacustrine fan is an important area for oil and gas exploration in the source. Taking the gravity flow in the slope break zone of the western Songliao Basin as the research object, the formation conditions, sedimentary characteristics, seismic response and distribution of the sublacustrine fan in the slope-break zone of the large depression basin are studied by using core, well logging and seismic data . The restoration of paleogeography of the lacustrine basin shows that the slope-breakback zone is the slope-breakback zone in the UK and Taiwan, and the slope break-off zone is an important site for gravity flow unloading. It provides the triggering mechanism for the formation of the gravity flow with the sedimentary movement, seismic activity and volcanic eruption. The sublacustrine fan is mainly composed of sandy debris flows, sliding rocks and slump rock blocks, and turbidite is extremely rare. The sublacustrine fan has the characteristics of sensitive seismic response, the lens is lenticular in section, and the internal amplitude and frequency vary greatly. The sublacustrine fan is mainly distributed in the rising stage of the reference plane of the fourth-order cycles, and is contiguously distributed on the outer side of the fan delta front in the plane. It has favorable conditions for hydrocarbon accumulation and is a favorable target for the exploration of lithologic reservoirs.