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- W2351958788 abstract "Well Zhong 1 is an important discovery well of oil and gas in Ordovician carbonate rocks located at the Northwestern Tazhong uplift. This paper presents an updated review of the multi-period and origin of carbonate karstification, which took into account of core observation, palaeo-biological analysis, seismic section and mineralogical and petrological and geochemical of calcite cements and calcites in cleavages and cavities or vuges. The two tectonic-related truncation and sedimentary gap surfaces have been identified, which hare some extent of relationship with carbonate karstification in Caledonian, the fact that calcites in cleavages and cavities or vuges in Ordovician carbonate rocks with rather low contents!of elements of Fe,Mn,Sr and Ba, and the normal value of δ 18 O(-6.4‰~-4.5‰)and δ 13 C(-1.4‰~0.5‰)in comparison with that of the average value of seawater of Ordovicianare believed to occurr as a composite results of syngenesis affected by the mixed fluid at shallow buried condition and later meteoric invasion; while the calcite cements developed in Bachu,Donghe formations and Silurian sandstones with the ramiform structures of infiltration metasomatism related with magmatic hydrothermalism and the low value of δ 18 O(-10.5‰~-16.1‰)and δ 13 C(-1.5‰~-9.6‰) indicated it had undergone an intense hydrothermal buried as well as Hercynian subaerial meteoric diagenetic change; the low data of strontium isotopic compositions( 87 Sr/ 86 Sr less than 0.7100) of filling calcites in cleavages and cavities or vuges in Kalashayi formation and Silurian and Ordovician system of Well Zhong-1 are explained as the results of the little effect of continental clastic sediment due to a rather short period of exposure; moreover, it may be concluded that no similar geological condition or background of a large scale of strong epigenic karstification exists in the Northwestern Tazhong just as occurred in the Tahei oilfield (Shaya uplift) with Palocave systems widely developed in forms of multiple passage caves in the Middle-Upper Ordovician carbonate." @default.
- W2351958788 created "2016-06-24" @default.
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- W2351958788 date "2005-01-01" @default.
- W2351958788 modified "2023-09-25" @default.
- W2351958788 title "Geological and Geochemical Implications for Multi-period and Origin of Carbonate Karstification in the Northwestern Tazhong:taking Well Zhong 1 as an example" @default.
- W2351958788 hasPublicationYear "2005" @default.
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