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Distribution and depositional model of microbial carbonates in the Ordovician middle assemblage,Ordos Basin,NW China

引用

Petroleum Exploration and Development 2021年第6期48卷 1341-1353页

作者： WEI Liubin ZHAO Junxing SU Zhongtang WEI Xinshan REN Junfeng HUANG Zhengliang WU Chunying State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu 610059China Institute of Sedimentary Geology Chengdu University of TechnologyChengdu 610059China Exploration and Development Research Institute of PetroChina Changqing Oilfield Company Xi’an 710018China National Engineering Laboratory for Exploration and Development of Low-Permeability Oil&Gas Fields Xi’an 710018China

Based on outcrop profiles,drilling cores,cast thin sections etc.,the types,microfacies combinations and distribution pattern of microbial carbonates in the Ordovician middle assemblage of the mid-eastern Ordos Basin have been systematically *** middle assemblage of Ordovician in the mid-eastern Ordos Basin has microbial carbonates formed by the calci-fication of cyanobacteria,including microbial biostromes and microbial mounds made of stromatolites,thrombolites,and *** distribution of the carbonates shows obvious“stratum-control”and“regional”*** microbial bio-stromes 2–3 m thick each are controlled by sequence cycles and sedimentary facies changes,and were mainly formed in the tidal flat environment during the depositional stages of the Ma56 and Ma55 *** microbial biostrome in the Ma55 sub-member occurring near the carbonate-evaporite transition interface in the early stage of the transgression is distributed mainly in the Mizhi subsag in the eastern part of the basin;the microbial biostrome in the Ma56 sub-member turns up near the carbonate-evoporite transition zone in ring shape in the east of the central *** ancient landform had noticeable control on the distribution of microbial *** microbial mounds or mound-shoal complexes developing mainly during the de-positional stages of Ma57_Ma510 sub-members are about 15–25 m thick in single layer and distributed largely in the Wushenqi-Jingbian *** development model of the microbial carbonate rocks shows that the carbonate-evaporite lithologic transition zone and the Wushenqi-Jingbian paleouplift are favorable exploration zones of microbial carbonates in the Ordovician middle assemblages.

关键词： Ordos Basin Ordovician Majiagou Formation microbial carbonates stromatolite thrombolite oncolite deposi-tional model

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