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鄂尔多斯分地西缘延安组层序地层划分 被引量:9

Sequence Stratigraphic Division of Jurassic Yanan Formation in West Ordos Basin
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摘要 利用层序地层学基本原理,对小(准)层序进行了重新定义,它既可以是向上变浅的层序,也可以是向上变深的层序;根据构造作用面、煤层或煤组具有的等时性,对鄂尔多斯地盆地西缘侏罗纪延安组进行了层序地层研究,划分为21个小层序,5个小层序组,组成了三个体系域;初始充填体系域主要由辫状河沉积体系组成,超覆充填体系域由曲流河-三角洲-浅湖沉积体系组成,退覆充填体系域由曲流河-三角洲沉积体系组成.表明它是一个完整的三级层序,经历了盆地形成、发展、萎缩的过程. The parasequence is redefined by the principle of sequence stratigraphy and it is either a upwards shallowing sequence or upwards deepening sequence. According to the isochronism of tectonic surface, a coal-bed and coal-bed group, the Yanan Formation in Jurassic at the west Ordos Basin is subdivided into 21 parasequences, 5 parasequence groups, and 3 system tracts. The primary filling system tracts consists mainly of braid river sedimentary system; The overlap filling system tract consists of meandering-delta-lacustrine sedimentary systems; And the off-lap filling system tract consists of meandering-delta sedimentary system. It indicates that the Yanan Formation is a whole third order sequence and has undergone the formation, development, atrophy of the basin.
出处 《中国矿业大学学报》 EI CAS CSCD 北大核心 2004年第1期15-18,共4页 Journal of China University of Mining & Technology
关键词 层序地层 侏罗纪 延安组 小层序 鄂尔多斯 煤层 Ordos Juarssic Yanan Formation sequence stratigraphy parasequence
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