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Restoration of formation processes of dolomite reservoirs based on laser U-Pb dating: A case study of Ordovician Majiagou Formation, Ordos Basin, NW China by Jingao ZHOU; Zhou YU; Dongxu WU; Junfeng REN; Daofeng ZHANG; Shaoyi WANG; Chen YIN; Yuxin LIU is a Engineering article available to read on EtoBox.

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To address the issue of non-unique interpretation of dolomite reservoir diagenetic and porosity evolution in the previous qualitative or semi-quantitative studies, we investigate two dolomite reservoir types, i.e. weathering-crust karstic reservoirs and mound-beach reservoirs, in the Ordovician Majiagou Formation, Ordos Basin by using in-situ laser ablation U-Pb dating as well as carbon and oxygen isotopic composition analysis. The results show that: (1) According to the dating of 8 reservoir samples, the Majiagou Formation experienced 5 diagenetic stages (Stage 1: deposition of matrix dolomite or penecontemporaneous dolomitization, in 444.0-494.0 Ma; Stage 2: dogtooth-or blade-shaped dolomite cementation, in 440.0-467.0 Ma; Stage 3: dolomitic silt filling, in 316.5-381.0 Ma; Stage 4: crystalline dolomite filling, in 354.0 Ma; Stage 5: crystalline calcite filling, in 292.7-319.0 Ma). (2) Supra-salt weathering-crust karstic dolomite reservoirs went through several diagenetic processes including penecontemporaneous dolomitization, compaction, weathering-crust karstification, packing, and rupturing in succession. Gypsum mold pores formed in the phase of hypergenic karstification and w

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Author

Jingao ZHOU; Zhou YU; Dongxu WU; Junfeng REN; Daofeng ZHANG; Shaoyi WANG; Chen YIN; Yuxin LIU

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Engineering (Physical Sciences)