Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (4): 117-122.doi: 10.3969/j.issn.1673-8926.2014.04.017

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Carbon and oxygen isotope analysis method for dolomite formation mechanism: A case study from Proterozoic dolomite in Yanshan area

LI Qianwen1，2， JIN Zhenkui1，2， JIANG Fujie1，2   

  1. 1. College of Geosciences， China University of Petroleum， Beijing 102249， China; 2. State Key Laboratory of Petroleum Resource and Prospecting， China University of Petroleum， Beijing 102249， China
  • Online:2014-08-15 Published:2014-08-15

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Abstract:

Dolomites are well developed in Gaoyuzhuang Formation to Wumishan Formation in Yanshan area, Beijing. However, the understanding of dolomite genesis in this area is still unclear. This paper used carbon and oxygen isotope analysis to carry out reconstruction of ancient salinity and ancient temperature of the dolomite samples selected from Gaoyuzhuang Formation, Yangzhuang Formation and Wumishan Formation in the Ming Tombs area. The result shows that in Gaoyuzhuang Formation, the mean of δ13C is -1.13‰, the mean of δ18O is -7.87‰ , the mean of Z is 122.188 5, and the average diagenetic temperature is 51.85 ℃; in the Yangzhuang Formation, the mean of δ13C is -0.93‰, the mean of δ18O is -6.11‰ , the mean of Z is 122.434 8, and the average diagenetic temperature is 47.82 ℃; in Wumishan Formation, the mean of δ13C is 0.13‰, the mean of δ18O is -4.60‰ , the mean of Z is 125.370 7, and the average diagenetic temperature is 39.48 ℃. According to the analysis of the above results, we concluded that most dolomites of Wumishan Formation were mainly resulted from penecontemporaneous dolomitization, and dolomites of Yangzhuang Formation were resulted from dorag dolomitization. The dolomite genesis of Gaoyuzhuang Formation is more complicated, which includes not only seepage reflux dolomitization but also dorag dolomitization.

Key words:  pre-stack time migration, pre-stack simultaneous inversion, S-wave prediction, angle stack, density prediction, fluid detection

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