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东营凹陷为下第三系断陷湖盆,它的北部边缘陡坡地带分布着一系列水下冲积扇。本文对其中四个地区的扇体进行了沉积相的研究,阐明了该区水下冲积扇的沉积相特征及其识别标志,并初步探讨了它们的形成条件。实践表明,在边界同生断层下降盘一侧,扇体的不同相带中,常可形成具有工业价值的多种类型的地层岩性油气藏,因而,寻找这类水下冲积扇,对于我国东部断陷湖盆,扩大油气勘探领域,具有重要的现实意义。
Dongying sag is the Lower Tertiary faulted lake basin, and a series of underwater alluvial fans are distributed on its steep slope on the northern margin. In this paper, we study the sedimentary facies of the fan bodies in the four regions, clarify the sedimentary facies characteristics of the alluvial fans in this area and their identification signs, and discuss their formation conditions. Practice shows that many types of lithologic reservoirs with industrial value can often be formed in the different facies belts of the synsedimentary fault-depression plate and fan body. Therefore, looking for such underwater alluvial fans, The eastern fault depression lake basin, expanding the field of oil and gas exploration, has important practical significance.