Geochemical features and its geological significances of the Upper Sinian Qigeblak Formation in Wushi area,Tarim Basin
Zheng Jian-Feng1,2, Liu Yu1,3, Zhu Yong-Jing1,2, Liang Feng1,2
1 Key Laboratory of Carbonate Reservoir,CNPC,Hangzhou 310023,China; 2 PetroChina Hangzhou Research Institute of Geology,Hangzhou 310023,China; 3 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China
Abstract：The Cambrian subsalt formation in Tarim Basin is rich in abundant hydrocarbon resource. The Upper Sinian Qigeblak Formation is one of the important exploration targets in this field. However,no exploration breakthrough has been made so far in this formation. The limited knowledge of lithofacies paleogeography and reservoir genesis led to the restriction of exploration breakthrough. In this paper,the Kungaikuotan outcrop of Wushi area located at NW Tarim Basin is selected as the study region. Based on detailed stratigraphic description,analysis on 104 petrographic thin sections,and multi-parameters geochemical data analysis(major and trace elements,REEs,carbon-oxygen and strontium isotope,the order degree of dolomite and in-situ U-Pb dating),the sedimentary environment of Qigeblak Formation and genesis of dolomite have been studied. It was found that: (1)the Qigeblak Formation of the Kungaikuotan section in the Wushi area of Tarim Basin has the thickness of 141 m,developing three kinds of microbial dolomite(e.g.,stromatolite,clotted limestone,foam laminated stone),two kinds of grainstone related with microbial action(oolite dolomite and grain dolomite). The Qigeblak Formation can be divided into four sections according to the combination of facies sequence,forming the lithofacies assemblage in carbonate gentle slope from inner ramp tidal flat to inner ramp microbial mound/shoal from bottom to up;(2)The sedimentary period of Qigeblak Formation was in a shallow sea water under warm and dry climate background. Seawater has high salinity,high water temperature and oxidation-weak oxidation characteristics and the sea level firstly gradually rised and then declined rapidly;(3)Dolomitization of the Qigeblak Formation took place in penecontemporaneous-early diagenetic period and the dolomitization fluid was the seawater with high salinity. These research results are of great significance to lithofacies palaeogeographic mapping in Late Sinian,Tarim Basin and analysis of reservoir genesis.
Zheng Jian-Feng,Liu Yu,Zhu Yong-Jing et al. Geochemical features and its geological significances of the Upper Sinian Qigeblak Formation in Wushi area,Tarim Basin[J]. JOPC, 2021, 23(5): 983-998.
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