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Title of Journal: Sci China Earth Sci

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Abbravation: Science China Earth Sciences

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SP Science China Press

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DOI

10.1002/art.37943

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1869-1897

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Formation and influencing factors of carbonate sou

Authors: Feng Liu JinGong Cai BingQuan Lü JinLi Xu
Publish Date: 2011/07/23
Volume: 54, Issue: 12, Pages: 1926-1939
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Abstract

Highlymature carbonate source rock is essential to the exploration of oil and gas in southern China In this study the carbonate strata in the relatively welldeveloped Lower Permian Chihsia Formation located in Chaohu Lower Yangtze were targeted and the formation and influencing factors of source rock were discussed based on paleoenvironment reconstruction using comprehensive sedimentology palynofacies and organic geochemistry data The results demonstrate that the Chihsia Formation is oxygendeficient biogenic carbonate sediments with marked variations in the organic and inorganic components formed during a period of Permian transgression The formation of source rock is the combined result of high bioproductivity and oxygendeficient environment generated by transgression and oxygenation events which frequently occurred during transgression periods Source rock was affected by selfdilution effects and diagenesis causing its heterogeneous distribution in many intervals Source rock is over 40 m thick and can be identified based on its different organic biological and mineral composition characteristics The carbonate rock appears to require no specific clay content in order to become a source rock The combination of sedimentology palynofacies and organic geochemistry has provided an effective means for evaluating and predicting highmaturity carbonate source rock in the region

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