《Table 1 Density and bulk geochemical compositions for oils from the Rewapu Block and neighboring ar

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《Geochemistry and origin of Ordovician oils in the Rewapu Block of the Halahatang Oilfield(NW China)》

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A total of 23 oil samples were collected from the Rewapu Block of the Halahatang Oilfield in the Tabei Uplift of the Tarim Basin.Four heavy oils from the Ha6 Block in the northern part of the Halahatang region were also analyzed for comparison（Table 1）.All oils are produced from the Ordovician carbonate reservoirs.These oils cover a wide spectrum of densities，ranging from light oils to ultra-heavy oils（Table 1）.Numerous studies by previous authors have summarized the geological background for the Paleozoic carbonate petroleum reservoirs in the Tabei Uplift（Zhang et al.2002；Zhang and Huang 2005；Wang et al.2008；Li et al.2011；Zhu et al.2012；Zhao et al.2015）.The Tabei Uplift is one of the main structural belts and the main part of the cratonic region of the Tarim Basin（Fig.1）.The Tabei Uplift was initially formed during Late Proterozoic to Devonian periods.Carboniferous to Permian Formations are mainly composed of interbedded strata of marine and terrestrial rocks.The uplift subsided continuously during the Jurassic to Paleogene and then experienced a rapid subsidence from the Neogene to the Quaternary.