二是上三叠系延长组三角洲油气区，主要位于盆地东部，具有湖相三角洲前积砂体和平原分流河道砂体两种油、气藏序列。
Triassic Yanchang deltaic oil-gas located in east of basin with two kinds of oil-gas reservoir sequence, the lacustrine facies delta foreset sand body and plain distributary sand body.
该区北部形成纵向三角洲，东部形成扇三角洲，西部形成斜坡前积复合体。
Longitudinal delta is developed in the north, fan-delta in the east, and slope progradation complex in the west.
前三角洲斜坡发育重力流的主要控制因素是三角洲的快速进积作用和前三角洲斜坡自身存在的二元结构。
The controlling factors for the development of gravity-flow deposits on prodelta slope are deltaic progradation and the double-layer structure of the slope.
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