Ordovician deep dolomite reservoirs in the intracratonic Ordos Basin, China Depositional model and Diagenetic evolution

Recent natural gas discoveries indicate that non-karstification-dominated reservoirs exist in the intracratonic Ordos Basin. This study examines the sedimentological and geochemical characteristics needed to clarify the depositional model and diagenetic evolution process of this newly discovered res...

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Bibliographic Details
Published inEnergy exploration & exploitation Vol. 36; no. 4; pp. 850 - 871
Main Authors Chen, Anqing, Xu, Shenglin, Yang, Shuai, Chen, Hongde, Su, Zhongtang, Zhong, Yijiang, Hu, Sihan
Format Journal Article
LanguageEnglish
Published London, England Sage Publications, Ltd 01.07.2018
SAGE Publications
Sage Publications Ltd
SAGE Publishing
Subjects
Densification
Dolomite
Evolution
Geological time
Natural gas
Reservoirs
Sea level
Selectivity
Special Issue: Advances of Petroleum Exploration and Geology Research in West China’s petroliferous basins
Tidal flats
Uplift
Variation
Wedges
Ordos Basin
Ordos Basin
Ordovician Majiagou Formation
peritidal sequence
dolomitization
Dolomite reservoir
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Summary:Recent natural gas discoveries indicate that non-karstification-dominated reservoirs exist in the intracratonic Ordos Basin. This study examines the sedimentological and geochemical characteristics needed to clarify the depositional model and diagenetic evolution process of this newly discovered reservoir type. The depositional environment of the dolomite reservoir can be characterized as a tidal flat that grew from the Central Paleo-uplift to the eastern depression by cyclic progradation on an epeiric platform. A tidal flat sequence can extend laterally as a progradational wedge in each cycle of sea level fluctuation. The sheet-shaped peritidal shoal facies associations patched on the wedge represent potential dolomite reservoirs and can be recognized by the presence of doloarenite that has been altered into a vaguely relict grained-texture by diagenesis. Although continuing destructive diagenesis has led to reservoir densification, burial dolomitization and burial dissolution with facies selectivity have tended to occur in peritidal shoal facies associations, thus improving the quality of the dolomite reservoirs. These models provide new insights for targeting deep dolomite hydrocarbon reservoirs in intracratonic basins.
ISSN:0144-5987
2048-4054
DOI:10.1177/0144598718778171