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Control of paleogeographic pattern on sedimentary differentiation of evaporite-carbonate symbiotic system:A case study of the sixth sub-member of ordovician majiagou formation M5 Member in central-eastern Ordos Basin,NW China

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Petroleum Exploration and Development 2022年第4期49卷 837-850页

作者： ZHONG Shoukang TAN Xiucheng HU Guang NIE Wancai YANG Mengying ZHANG Daofeng ZHENG Jianfeng XU Jie DONG Guodong XIAO Di LU Zixing State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu 610500China Southwest Petroleum University Division of Key Laboratory of Carbonate Reservoirs CNPCChengdu 610500China Natural Gas Project Department Changqing Oilfield Company of PetroChinaXi'an 710016China Research Institute of Exploration and Development Changqing Oilfield Company of PetroChinaXi'an 710016China PetroChina Hangzhou Research Insitute of Geology Hangzhou 310023China

The relationship between paleogeographic pattern and sedimentary differentiation of evaporite-carbonate symbiotic system is examined based on logging,core and thin section data,by taking the sixth sub-member of fifth member of ordovician majiagou formation(M56)in the central-eastern Ordos Basin as an example.(1)Seven sub-geomorphic units(Taolimiao west low,Taolimiao underwater high,Taolimiao east low,Hengshan high,East salt low,North slope and Southwest slope)developed in the study area.(2)The“three lows”from west to east developed dolomitic restricted lagoon,evaporite evaporative lagoon and salt evaporative lagoon sedimentary facies respectively,the"two highs"developed high-energy grain beach and microbial mound,and the north and south slopes developed dolomitic flats around land.(3)The paleogeographic pattern caused natural differentiation of replenishment seawater from the northwest Qilian sea,leading to the eccentric sedimentary differentiation of dolomite,evaporite and salt rock symbiotic system from west to east,which is different from the classic“bull's eye”and“tear drop”distribution patterns.(4)As the Middle Qilian block subducted and collided into the North China Plate,the far-end compression stress transferred,giving rise to the alternate highland and lowland in near north to south direction during the sedimentary period of M56 sub-member.(5)Taolimiao underwater high and Hengshan high developed favorable zones of microbial mounds and grain shoals in south to north strike in M56 sub-member,making them favorable exploration areas with great exploration potential in the future.

关键词： paleogeographic pattern sedimentary differentiation evaporite and carbonate rock favorable reservoir facies zone ordovician majiagou formation Ordos Basin

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

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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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Distribution, evolution and structural properties of Wushenqi paleo-uplift in Ordos Basin, NW China

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Petroleum Exploration and Development 2023年第4期50卷 865-877页

作者： MAO Danfeng HE Dengfa BAO Hongping WEI Liubin XU Yanhua CHENG Xiang GOU Junyi WU Saijun School of Energy Resources China University of Geosciences(Beijing)Beijing 100083China Research Institute of Exploration and Development under Changqing Oilfield Branch Company PetroChinaXi’anShaanxi 710018China Research Institute of Petroleum Exploration&Development PetroChinaBeijing 100083China

This paper depicts the distribution of the Wushenqi paleo-uplift in the Ordos Basin by using the latest drilling and seismic data, and analyzes the tectonic evolution of the paleo-uplift with the support of Bischke curve and balanced section. The compressional Wushenqi paleo-uplift which developed in the Early Caledonian orogeny(Huaiyuan orogeny) is approximately a ellipse extending in S-N direction. Its long axis is about 194 km and short axis is about 55-94 km in nearly W-E direction. The denudation thickness and area of the Cambrian in the core are 170-196 m and 11 298 km^(2), respectively. It was mainly formed during the Huaiyuan orogeny according to the chronostratigraphic framework. It was in the embryonic stage in the Middle-Late Cambrian, denuded after developed obviously at the end of Late Cambrian. The paleo-uplift of the 3rd member of the ordovician majiagou formation was reactivated and reduced in area. In the sedimentary period of the Ma 4 Member-pre-Carboniferous, the paleo-uplift experienced non-uniform uplift and denudation. It entered the stable period of burial and preservation in the Carboniferous and later period. The Wushenqi paleo-uplift was formed on the weak area of the basement and tectonic belts, into an compressional structure with irregular morphology, under the control of the non-coaxial compression in the south and north and the stress transmitted by the uplift in the basin. The Wushenqi paleo-uplift has a controlling effect on the sedimentary reservoirs and hydrocarbon accumulation.

关键词： Ordos Basin Wushenqi paleo-uplift ordovician majiagou formation unconformity Caledonian orogeny tectonic evolution

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