The Accumulation Characteristics of the Paleozoic Reservoir in the Central-Southern Ordos Basin Recorded by Organic Inclusions

Figure 3

Microscopic photographs of early and late-stage inclusions in Ordovician Majiagou Formation dolomite. (a) Liquid hydrocarbon inclusions in dolomite dissolution pores, F6 well, 2770.9 m, O₂, (+); (b) the same field of view as (a), fluorescence microscope; (c, d) gaseous hydrocarbon inclusions in late bright crystal calcite filled with dissolution pores, Xt 1 well, 3297.5 m, O₂, (+); (e) gaseous hydrocarbon inclusions in late-stage calcite filled with dissolution pores, Y2 well, 2528.7 m, O₂; (f) methane-rich gas inclusions in bright crystal calcite, F6 well, 2770.9 m, O₂, (+).

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