【摘要】 主要应用地震沉积学方法对松辽盆地齐家—古龙凹陷上白垩统嫩江组沉积体系及沉积相进行地震成像。在一个相对的地质时间范围内,以测井和地震资料相结合进行的三级层序对比为基础,应用可视化属性解释和地层切片等地球物理技术对地下地质体进行精细刻画和解释,以揭示高分辨率储集层沉积体特征。经研究,在齐家—古龙凹陷发育重力流水道、湖底扇和河流三角洲等沉积相。在对该区沉积相地震成像的基础上,探讨了嫩江组沉积体成因及地震地貌样式,揭示了嫩江组发育的典型沉积体的空间展布及河道变迁,指出砂岩主要分布在分流河道、下切谷、河口坝以及滩坝中,为在松辽盆地湖相泥岩中寻找岩性油气藏提供了有利依据。更多还原

【Abstract】 A seismic-sedimentologic study was performed to image the depositional systems of the Nenjiang Formation in the Qijia-Gulong Sag of the Songliao Basin.Based on third order sequence-stratigraphic correlations from seismic and wire-line-log data,the authors used geophysical technology,including visual attribute interpretation and strata slices,to image and reveal high-resolution reservoir depositional systems in a relative geologic time.Three types of depositional systems have been identified in the Nenjiang Formation,including the gravity flow channel,sublacustrine fan,and fluvial delta.Based on imaging the depositional systems,the authors investigated the origins of the sedimentary bodies and their seismic geomorphologic patterns,and revealed the spatial distribution of typical sedimentary bodies and the channel changes in the Nenjiang Formation.The results indicated that sandbodies occurred primarily in the distributary channel,incised valleys,mouth bar and point bar.This study provides favorable evidence for finding hydrocarbon reservoirs in lacustrine mudstones in the Songliao Basin.更多还原