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- Title
Sequence stratigraphy and sedimentary filling evolution of the Cretaceous in Southwest Depression,Tarim Basin.
- Authors
Ren Yu-ze; Lin Chang-song; Gao Zhi-yong; Liu Jing-yan; Song Ning-ning
- Abstract
Based on the comprehensive correlation of outcrops data,logging data and drilling data,we established the Cretaceous sequence stratigraphic framework in the piedmont zone of the south Tianshan and western Kunlun mountains in Southwest Depression,Tarim Basin. According to the regional unconformities and regional mutations in the interface of sedimentary facies,two second-order sequences of the Cretaceous in the study area were recognized,which can be further divided into four third-order sequences based on the change of sedimentary facies,transforming surface of stratigraphic accumulation type and the structure of sedimentary cycle. Based on the analysis from outcrops and wireline logging datasets in the study area,we recognized five sedimentary facies including alluvial fan,braided river,meandering river,braided river delta,meandering river delta. The distribution pattern of sedimentary systems for each sequence is systematically studied,through which the spatial distribution and vertical evolution of depositional systems are revealed. Studies show that the deposition scope and the depositional systems had changed significantly in Cretaceous in Southwest Depression. The large-scale sea transgression events were generally proved by the evidence that the sedimentary scope changed from piedmont belt to intra-basin in the study area. The sedimentary systems showed an overall evolution process from continental sedimentation to marine deposition.
- Subjects
TARIM Basin (China); OUTCROPS (Geology); STRATIGRAPHIC geology; ALLUVIAL fans; CRETACEOUS Period
- Publication
Natural Gas Geoscience, 2017, Vol 28, Issue 9, p1
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2017.08.002