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Zheng Yangdi, Cai Jingong. Characteristics of carbon and oxygen isotopes of carbonate rocks in South Yellow Sea Basin and their implication[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2013, 35(3): 307-313. doi: 10.11781/sysydz201303307
Citation: Zheng Yangdi, Cai Jingong. Characteristics of carbon and oxygen isotopes of carbonate rocks in South Yellow Sea Basin and their implication[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2013, 35(3): 307-313. doi: 10.11781/sysydz201303307
shu

Characteristics of carbon and oxygen isotopes of carbonate rocks in South Yellow Sea Basin and their implication

doi: 10.11781/sysydz201303307

  • State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China

  • Received Date: 2012-08-03
  • Rev Recd Date: 2013-04-17
  • Publish Date: 2013-05-28
    Abstract
  • Based on the analyses of carbon and oxygen isotope composition and palynofacies of carbonate source rocks (P1q-T1q) from the South Yellow Sea Basin,the formation and controlling factors of effective source rocks of marine facies were studied.The correlation between δ13C and δ18O indicated that the carbon and oxygen carbon isotope compositions were similar to those in original ocean.The δ13CPDB values in P1q were heavier than those in T1q,indicating for higher biological productivity,which was favorable for source rock generation.Based on mean value,the δ13CPDB values of P1q were divided into 3 evolution stages corresponding to the changes of palynofacies,indicating that the formation of source rocks varied among different layers.The δ13CPDB values in P1q from well WX5-ST1 were 3.83‰ in average,obviously heavier than those from well CZ24-1-1 (-1.34‰ in average).It corresponded to the high content of amorphous organic matter,and proved the differences of source rock formation among different regions in the same layer.The comparison of carbon and oxygen isotopes and palynofacies showed that the effective matching of biological productivity and preservation condition was favorable for source rock formation.

     

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