The Sequence Configuration and Depositional Infilling Characteristics of Lower Cretaceous in Chagan Sag
详细信息
- 责任者：Yang Guochen (Postdoctoral Workstation ; Zhongyuan Oilfield Company ; SINOPEC ; Puyang 457001 ; China) ; Jiao Daqing
- 刊名：Xinjiang Geology
- 出版年：2013
- 卷期：31(3)
- 关键词：早白垩世 ; Lower Cretaceous ; 层序地层学 ; sequence stratigraphy ; 新疆 ; Xinjiang
- 页码：p.223-230
- 图表：7 illus., 1 table, 25 refs.
- 分类号：1200
- issnNo：ISSN1000-8845
- isbnNo：CN65-1092/P
摘要
Researches show that the Lower Cretaceous sequence configuration of Chagan sag is complicated and multiple,and has a quick space-time change.A new method of adopting the fraction of A/B to characterize sequence configuration is put forward in order to more wholly and clearly reveal the internal architectural features of sequences in the region.Through the comprehensive analysis of the geological,well-drilling,well-logging and seismic data,the Lower Cretaceous in Chagan sag is subdivided into two tectonic sequences,four super sequences,seven third-order sequences and seventeen system tracts,and the isochronous sequence stratigraphic framework of Lower Cretaceous is established.In the stratigraphic framework this method is used to study the stratum structure characteristics of every sequence,all the third-order sequences of Lower Cretaceous in Chagan sag are divided into twelve sequence configuration types including L/LTH type,T/LTH type,H/LTH type,TH/LTH type,L/LT type,T/LT type,LT type,T/TH type,H/TH type,TH type,T type,H type,and two sequence types including LTH type and TH type.On this basis the sequence configuration types and their spatial distribution,and the depositional infilling characteristics of system tracts of every sequence are analyzed in detail.It is indicated that different geological evolution stages have apparently different sequence configuration characteristics.
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