摘要
采用经典层序地层学与现代沉积学的原理和方法,着眼于塔里木盆地台盆区的整体研究,综合利用地震、钻井、测井等资料,探讨了台盆区层序内部结构及层序演化模式。分析表明,台盆区三叠系主体在挤压背景下发生挠曲而大面积稳定沉降,在古克拉通盆地基础上形成开阔的坳陷型湖盆。内部层序结构具有经典层序地层学缓坡背景下层序模式特点,具明显的"三元"结构,因湖盆坡度十分宽缓,水体较浅,低位体系域低位扇体发育较少,湖扩体系域呈现远距离的上超,高位体系域具波及范围广泛的平缓前积反射。层序内幕结构表现为单个层序内沉降中心向北迁移以及多个层序沉降中心总体向北迁移的特征,即是层序受控于幕式挤压挠曲作用的具体体现,并与该时期北部沉降、南部抬升的基底变形特点一致。
Although the sedimentation and sequence stratigraphy of the Triassic from Tabei area in Tarim Basin has been studied in the past,research on the sequence structures and evolution patterns on the whole basin range is rare,especially in the depression lake basin under compressional background.Using the theories and methods of classical sequence stratigraphy and modern sedimentology,emphasizing the overall research of the whole platform area of Tarim Basin,we analyzed seismic data,logging and drilling core data of Triassic in Tarim Basin and discussed the sequence structures and evolution patterns in plateform area.The results show that plateform area of Triassic is deposited stablely in compressional background,and broad depression basin is formed in the paleocraton basin.Internal sequence structures have the feature of classic sequence stratigraphy in the gentle slope background,which have three dimensional structures.Because of wide and slow slope and shallow water in the basin,low fan body of lowstand systems tract is not much developed,and transgressive systems tract has the feature of onlap with a long distance.The wide spread range of gentle reflection is well developed in highstand systems tracts.Centers of subsidence in a single and multiple sequences move into northward is the typical insider sequence structure,which shows that sequence structures and evolution patterns are controlled by the compaction flexture,and this phenomenon is consistant with the basal deformation of sedimentation in the north and uplift in the south.
出处
《地质科技情报》
CAS
CSCD
北大核心
2013年第4期50-54,共5页
Geological Science and Technology Information
基金
中国石油化工股份有限公司西北油田分公司攻关课题项目(KY-S-2008-088)
关键词
塔里木盆地
三叠系
层序结构
演化模式
Tarim Basin
Triassic
sequence structure
sequence evolution pattern
