Research Article
Pore Fluid Evolution Influenced by Volcanic Activities and Related Diagenetic Processes in a Rift Basin: Evidence from the Paleogene Medium-Deep Reservoirs of Huanghekou Sag, Bohai Bay Basin, China
Figure 7
Photomicrographs of feldspar dissolution and dolomite encrustation in the Paleogene sandstone reservoirs in the well BZ-1 of Huanghekou Sag. (a) K-feldspar (Kf) dissolution, E2s1, 3037 m (9964 ft). (b) Backscattered electron (BSE) image of dolomite encrustation, E2s2, 3084 m (10,118 ft). (c) Micrograph of CL showing the calcite cements (orange luminescent), E2s2, 3084 m (10,118 ft). (d) Micrograph of BSE showing dolomite encrustation around the detrital quartz, E2s1, 3037 m (9964 ft). (e) Idem with D but ESEM micrograph, E2s1, 3037 m (9964 ft). (f) Micrograph of BSE showing dolomite debris (within the white dotted line) and pectinate dolomite encrustation (outside the white dotted line), E2s2, 3084 m (10,118 ft). Cal = calcite, Dol = dolomite, F = feldspar, Kf = K-feldspar, Kln = kaolinite, and Q = quartz.
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