Carbonate petrological characteristics and sedimentary environment of the Upper Ordovician in Bachu area, Tarim Basin
Niu Jun1, 2, 3, Huang Wenhui1, 2, 3, Wang Xin1
1 School of Energy Resources,China University of Geosciences(Beijing),Beijing 100083; 2 Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Education Ministry,China University of Geosciences(Beijing),Beijing 100083 3 Key Laboratory of Shale Gas Exploration and Evaluation,Ministry of Land and Resources, China University of Geosciences(Beijing),Beijing 100083
Abstract：Combined with the profile measurements in the field and the indoor thin section identification,this paper conducts rock components, petrological types and sedimentary environment analysis of carbonate rocks of the Upper Ordovician Tumuxiuke Formation and Lianglitage Formation in Bachu area of Tarim Basin. The results show that the two stratigraphic units have difference in fossil assemblages,granular components and matrix types and texture. The petrological type of Tumuxiuke Formation is only micritic￣bioclastic limestone composed of Ostracodas and Trilobites, while twelve types in Lianglitage Formation are recognized such as pelletoid-algal limestone,intraspararenite,sparry sand￣sized intraclast limestone,algal limestone,micritic limestone with bilclasts and pelletoidal limestone. According to the analysis of petrological types and outcrop observing,the Tumuxiuke Formation carbonate rocks were mainly formed in reef-front slope, while the Lianglitage Formation carbonate rocks were formed in open platform and organic reefs,implying a relatively shallow sedimentary environment. Organic reef facies of platform margin were developed between No.Ⅰ section and No.Ⅱ section,with three algal reefs arranged in turn from south to north.
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