foreset bed [地质] 前积层
recumbent foreset 伏卧前积层
foreset bedding 前积层理 ; 前积层
foreset laminae 前积纹层
delta foreset stratification 三角洲前积层理
foreset deposit 前积层又称前组沉积
foreset beds 前积层
foreset body 前积体
foreset mine 斜硐
Steeply tilted foreset beds are formed only under very restricted condition.
陡斜的前积层只有在非常严格的条件下才能形成。
Some of the facies like mounds, drapings, foreset and chaotic facies are believed to be directly related to oil and gas accumulations.
一些地震相，如丘状相、披复相、前积相和杂乱相与油气聚集有直接的关系。
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.
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。
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