Formation mechanisms of the Paleogene lacustrine microbial carbonate rocks in Pingyi Basin，Shandong Province
Tang Xinping1,2, Huang Wenhui1,2, Deng Hongwen1,2, Wang Wenyong1,2, Mu Nana1,2
1 Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism， Ministry of Education，China University of Geosciences(Beijing)，Beijing 100083 2 School of Energy Resources，China University of Geosciences(Beijing)，Beijing 100083
Abstract：The origin of microbial carbonate rocks has become a hot issue of sedimentology，the Paleogene lacustrine carbonate rocks，however，are still rarely noticed and studied.In order to study the origin of the Paleogene lacustrine microbial carbonate rocks in the Pingyi Basin，field inspection as well as observations of plain microscope and scanning electron microscope，were carried out.The following results were obtained:(1)Microbial carbonate rocks in the studied section mainly consist of oncolites，thrombolites and stromatolites.(2)In each of these carbonate rocks，coccoid cells，sheet structures and clotted fabric were found，which illuminate the common microbial actions during their formation，including secretion，agglutination and calcification.(3)These 3 microbial carbonate rocks were formed in different environments，which play a great role in the development of textures and shapes of microbial carbonates，because microbial fabrics and microbial actions are sensitive to the instable lacustrine environment.（4）Based on the analyses of the common microbial actions and different forming environments，the genetic model of lacustrine microbial carbonate rocks was presented.
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