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近年来,在我国东部地区一些第三纪的断陷湖盆中发现了一种主要由粗粒碎屑沉积物组成的水下扇形体.这种水下扇形体是由近源的洪水携带大量陆源碎屑直接入湖而形成的.当含有大量负载的洪水进入湖盆时,除具有密度流的特性外,仍然表现出一定的冲积性质.因此,我们把它称为水下冲积扇,以便区别于深海盆地中所发育的海底扇.目前,在泌阳和黄骅拗陷下第三系的这类沉积物中已发现丰富的油气资源,它可能为找油提供一个新的领域.因此水下冲积扇的研究具有重要的理论和实际意义.
In recent years, an underwater sector mainly composed of coarse-grained clastic sediments has been found in some Tertiary rift lakes in the eastern part of our country, which are carried by floods near by sources Terrestrial debris directly into the lake formed when the load contains a flood into the lake basin, in addition to having the characteristics of density flow, it still shows some alluvial nature, so we call it underwater alluvial fan, so that Which is different from the submarine fan developed in the deep-sea basin.At present, abundant oil and gas resources have been found in the sediments of the Tertiary in Biyang and Huanghua Depression, which may provide a new field for oil discovery.Therefore, water The research of the lower alluvial fan has important theoretical and practical significance.