再论双河油田扇三角洲沉积模式

前人研究认为。双河油田核三段为吉尔伯特型扇三角洲沉积。通过对该段沉积背景、沉积相展布、沉积物特征、沉积构造和沉积层序研究表明，研究区目的层段沉积坡度较缓、前缘亚相发育、沉积物粒度相对较细，其沉积构造以牵引流沉积构造为主．重力流沉积构造不发育．沉积层序特征既不具典型的河流沉积特征。亦无明显重力沉积特征．与吉尔伯特型和陆坡型扇三角洲都存在较大差异，类似于在盆地底部地形较为平缓的条件下形成的陆架型扇三角洲沉积。

Fan Delta Depositional Modes in Shuanghe Oilfield

It was considered by predecessor study that Eh 3 in Shuanghe Oilfield was a Gilbert type fan delta. Study of its depositional background, sedimentary facies distribution, its deposit properties, sedimentary structure and its sedimentary sequence shows that in the studied area depositional slope is gentle, frontal subfacies is developed, deposit particles are relatively fine in the target zone, its sedimentary structure is mainly of drag flow sedimentary structure, gravity flow sedimentary structure is undeveloped. The characteristics of its sedimentary sequence is not a typical fluvial depositional one, or a obvious gravity flow depositional one, there are bigger differences among these 3 deltaic modes, the fan delta sedimentary mode is similar to that of continental fan delta formed under more gentle conditions on the basin bottom.