塔里木盆地侏罗系层序地层特征
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摘要
通过野外露头资料、测井资料和地震资料分析,塔里木盆地侏罗系可识别出8个层序边界,除层序边界JSB6和JSB7为Ⅱ型外,其他均为Ⅰ型。层序界面上下常表现为沉积相突变或地层缺失。根据8个三级层序边界可识别出7个三级层序,即JSQ1~JSQ7,各层序在盆地内的分布却不均匀。JSQ1和JSQ2层序分布在阿克库勒凸起的于奇地区、满加尔、草湖和塔东隆起区西部凹陷区等,JSQ3层序在全区均有分布。JSQ4和JSQ5层序主要分布在草湖、满加尔和塔东隆起区西部等地区。JSQ6和JSQ7层序主要分布在库车坳陷区,但在塔里木盆地内部没有发育。后期的局部隆升剥蚀和古地貌是造成侏罗系层序平面分布不均的主要原因。
Based on analysis of outcrops,logging,and seismic data,8 sequence boundaries can be recognized in Jurassic in Tarim Basin.Except that sequence boundaries of JSB6 and JSB7 are type Ⅱ,the others are type Ⅰ.The abrupt change of facies and strata erosion are often developed from lower to upper of sequence boundaries.7 sequences can be recognized according to 8 sequence boundaries.The sequences are distributed unevenly in Tarim Basin.Sequences JSQ1 and JSQ2 are developed in Yuqi area of Akekule,Manjiae,Caohu,and western part of Tadong area.JSQ3 is distributed all over the study area.Sequences of JSQ4 and JSQ5 are found in Caohu,Manjiae and western part of Tadong area.JSQ6 and JSQ7 are distributed in Kuqa depression,with no distribution inner Tarim Basin.There are various types of Jurassic facies,including fan delta,fluvial,lacustrine,slope fan developed in LST and delta.Later uplift,erosion and palaeogeomorphology are the main reasons for the uneven distribution of Jurassic sequence.
引文
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