【摘要】 八道湾组是焉耆盆地四十里城凹陷当前寻找隐蔽圈闭的重点层位之一,但相关研究还有待深入。为此,利用地震线描法对贯穿四十里城凹陷的4条测线八道湾组进行了沉积盆地原形恢复,通过对其内部地层堆砌方式、反射波终止类型及钻井岩性组合特征的分析,将八道湾组划分为3个层序,并在层序内部识别出低位、水进、高位和强制水退体系域,从而搭建了研究区八道湾组层序地层格架;在此基础之上,结合沉积构造背景,开展格架内的地震相—沉积相分析,识别出低位三角洲、冲积扇、河道等沉积相带。结果表明,强制水退体系域发育的系列前积层为砂泥互层的响应,具有发育岩性圈闭的潜力,是下一步勘探研究工作的重点。更多还原

【Abstract】 In Sishilicheng depression of Yanqi Basin, Badaowa Formation becomes one of the most important payzones when searching for subtle trap. In this study, the formation is restored through seismic-line description and by 4 seismic lines across the depression. And then, the arrange style and reflection termination kind of inner layers and the drilling lithological compound characteristics are analyzed. Badaowa Formation can be classified into 3 sequences. And 4 tract systems are also recognized (including low stand tract, transgressive tract system, highstand tract and forced regressive tract system) within these sequences. In addition, some sedimentary facies belts are presented, including lowstand delta, alluvial fan and channel, based on an analysis of both seismic faices and sedimentary facies. The results illustrate that the series foreset developed at forced regressive tract system not only is a response of sandstone interbedded with shale, but also has a potential to developing lithological trap. It will be an important target for further exploration.更多还原