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Simplified paleogeographic map of the Ordos Basin during Ordovician M5 period

Simplified paleogeographic map of the Ordos Basin during Ordovician M5 period

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The dolomite reservoir in the 5th member of the Ordovician Majiagou Formation (M5) in the Ordos Basin can be divided into two types based on whether or not gypsum is present, i.e., gypsum-bearing and gypsum-free reservoirs. The gypsum-bearing reservoir mainly develops in the 1–4th sub-members of M5 and is composed of micritic to silt-sized dolomite...

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