Spatial-temporal distribution of lacustrine carbonate rocks in China and their carbon and oxygen isotopic characteristics
Su Ling1, 2, 3, Zhu Rukai1, 2, 3, Cui Jingwei1, 2, 3, Wu Songtao1, 2, 3, Luo Zhong1, 2, 3, Mao Zhiguo1, 2, 3, Li Sen1
1 PetroChina Research Institute of Petroleum Exploration & Development,Beijing 100083; 2 CNPC Key Laboratory of Oil and Gas Reservoirs,Beijing 100083; 3 National Research Center of Tight Oil,Beijing 100083
Abstract:Lacustrine carbonate rocks have various occurrences. They commonly occur as the interbeds in clastic rocks with characteristics of multi-layers,thin individual layer and rhythm. Occasionally,they occur in mudstone and shale as thin layers of concretions or calcareous microfossils. Controlled by tectonic background,provenance and palaeoenvironment,the lacustrine carbonate rocks in China show wide spatial-temporal distribution,which were firstly reported in the Permian,but mainly found in the Paleogene. Based on carbonate and oxygen isotope analysis,different water environments during primary deposition and diagenetic process are concluded: (1)Well-related δ13C and δ18O with mostly positive δ13C values,indicating a closed saltwater or semi-saltwater lake environment;(2)Completely-unrelated δ13C and δ18O values with mostly negative δ13C values,indicating an open lake environment;(3)Seriously-positive δ13C values,indicating that during diagenesis,the environment was affected by the methane generation process,which was participated by archaebacteria.
Su Ling,Zhu Rukai,Cui Jingwei et al. Spatial-temporal distribution of lacustrine carbonate rocks in China and their carbon and oxygen isotopic characteristics[J]. JOPC, 2017, 19(6): 1063-1074.
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