前三角洲相(prodelta facies)是三角洲相沉积亚相类型之一。三角洲沉积相共分为三个亚相,即三角洲平原亚相(delta-plain facies)、三角洲前缘亚相(delta-front facies)、前三角洲亚相(prodelta facies)。其中,三角洲平原亚相是三角洲的水上部分,三角洲前缘亚相和前三角洲亚相为水下部分。
辫状三角洲体系的平原相基本上由辫状河道沉积组成,三角洲前缘及前三角洲相带则以快速堆积、滑塌及浊流沉积为主。
Braid delta systems mainly consist of braid river deposits in delta plain facies, rapid accumulation deposits, slump deposits and turbidites in delta front and prodelta facies.
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.
扇三角洲沉积体明显地可划分为:扇三角洲平原亚相、扇三角洲前缘亚相和前扇三角洲亚相。
The fan deltaic body can be divided into three subfacies, named fan delta plain, fan delta front and pro-fan delta.
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