| 普光气藏长兴—飞仙关组碳酸盐岩C、O同位素、微量元素分析及古环境意义 |
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| 关键词:Puguang gas field Changxing-Feixianguan Formation carbonate rocks: carbon isotopic oxygen isotopic trace elemet paleo-envionmen |
| 基金项目:中国石油化工股份有限公司项目(编号：G0800-06-ZS-138) |
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| Carbon, Oxygen Isotope and Trace element Characteristics of Carbonate Rocks in Changxin-Feixianguan Formation of Puguang Gas Pool and Its Palaeoenvironment Significance |
| With Wells Puguang 2 and 6 in the Puguang gas field as the research object, the authors used 116 dolomite samples from Changxing-Feixianguan Formation to analyze characteristics of carbonate and oxygen isotopes, judge the ancient seawater salinity and, combined with sedimentary characteristics, study the sedimentary environment. The result shows that d 13C and salt Z is positively correlated with each other. From Member 1 and 2 through Member 3 to Member 4 of Feixiangaun Formation in Well Puguang 2, sedimentary facies experienced the evolutionary process of platform edge shallow facies-restricted platform-evaporate flat, and the salinity, d13C, Sr, P, Ti and Mn values gradually decreased. During the period of Member 1 and 2 of Feixiangaun Formation, d13C, Sr, P, Ti and Mn values were low and the fluctuation was not obvious, suggesting that the variation of the sea level was insignificant. In addition, the elution of fresh water caused the devrease of the salinity. The period of Member 3 of Deixiangaun Formation was in a tidal flat environment with dry and hot climate, during which the fresh water was considerably evaporated, the salinity increased, the d13C, Sr, P, Ti and Mn values increased, the sea level change was obvious and, as a result, the d13C fluctuation was remarkable.The carbon isotope values decreased abruptly at the last stage of the Changxing Formation, which is probably attributed to the death of large quantities of stenohaline organisms at the end of Permian. |
| XU Li-heng,CHEN Jian-fang,LI Ling,MA Guang-yu,LIU Yu-dan.2009.Carbon, Oxygen Isotope and Trace element Characteristics of Carbonate Rocks in Changxin-Feixianguan Formation of Puguang Gas Pool and Its Palaeoenvironment Significance[J].Acta Geoscientica Sinica,30(1):103-110. |
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