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早白垩世泉头组四段沉积时期,松辽盆地南部存在两个主要陆源。扶余三角洲是南部陆源经河流搬运入湖堆积而成的。泉四段晚期,古松辽湖泊开始逐渐扩张。在湖侵背景下,扶余三角洲呈现出“叶状”几何形态,其沉积特点是分支河道较乡,并在主流线一侧发育,分支河道砂岩发育,河口砂坝较短小。随着湖侵加剧,扶余三角洲沉积结束,代之是普遍的湖相泥、页岩沉积。在泉四段扶余油层上发现的油田,主要分布在扶余三角洲地区,条带状河道砂岩成为良好的储油空间。除构造圈闭外,断层切割河道砂岩具有圈闭石油的重要作用,将是今后不可忽视的勘探目标。
During the deposition of the fourth member of the Early Cretaceous Quantou Formation, there are two main land sources in the southern Songliao Basin. Fuyu Delta is the southern land source transported by the river piled into the lake formed. Four late spring, Gusong Liaohu began to gradually expand. Under the background of lake invasion, the Fuyu delta shows a “leafy” geometry. Its sedimentary characteristics are that the branch channels are relatively rural and develop on one side of the main streamline, and branch river sandstones are developed, and the estuary sand bars are short and small. With the intensification of the lake invasion, the sedimentation of the Fuyu delta has ended, replacing it with the common lacustrine mud and shale deposits. The oil fields discovered in the fourth member of the Fuyu oil field are mainly distributed in the Fuyu Delta. The sandstone of the banded channel becomes a good oil storage space. Besides structural traps, fault-cutting channel sandstone plays an important role in trapping petroleum and will be an exploration target that can not be ignored in the future.