摘要
目的全面分析塔里木盆地古近系层序地层学特征。方法通过野外露头资料、测井资料以及地震资料进行综合分析。结果塔里木盆地古近系可识别出5个层序界面,划分出4个三级层序,除第一层序分布较局限外,其他层序在塔里木盆地均有分布。每个层序均可识别出低位体系域、湖侵体系域和高位体系域。古近系沉积体系类型包括河流相、三角洲相、湖泊相和冲积扇相。古近系宽浅型湖泊层序低位体系域最发育;湖侵体系域沉积厚度小,且沉积物粒度细;高位体系域常发育不全,多被侵蚀。结论古地貌对塔里木盆地古近系层序特征具有明显的控制,塔里木盆地内部地势相对平坦,层序内部以低位体系域和湖侵体系域为主。在盆地边缘的拗陷区,各层序体系域发育齐全,沉积厚度较大。
Aim To study the sequence stratigraphy of Paleogene in Tarim basin completely. Methods Based on comprehensive study of outcrops, logging data and seismic data. Results 5 sequence boundaries and 4 third-order sequences can be recognized in Paleogene in Tarim basin. Sequences distribute all over the Tarim basin, except the first sequence distributed locally. Every sequence can be subdivided into lowstand system tract （LST）, trangressive system tract （TST） and highstand system tract （HST）. Sedimentary types of Tarim basin include fluvial, lake, delta and alluvial fan. The lowstand system tract develops best among three system tracts, and the thickness of tran- gressive system tract is smaller and grain is finer. The highstand system tract does not present well, because of ero- sion. Conclusion The distribution features of sequence are controlled by paleogeomorphic. The terrain in Tarim basin is relatively flatter, and the sequences develop lowstand system tract and trangressive system tract well in Tar- im basin. The sequences developed on margin of Tarim basin develop fully, and the deposition thickness is high.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第5期813-818,共6页
Journal of Northwest University（Natural Science Edition）
基金
国家重大专项基金资助项目(2008ZX05002-005-007HZ)
关键词
宽浅型湖泊
层序地层学
塔里木盆地
古近系
低位体系域
wide-shallow lake
sequence stratigraphy
Tarim Basin
Paleogene
lowstand system tract
