Figure 7 | Scientific Reports

Figure 7

From: Fluid evolution and related fluid–rock interactions of the Oligocene Zhuhai sandstones in the Baiyun Sag, northern margin of the South China Sea

Figure 7

Photomicrographs of carbonate cements in the Zhuhai sandstones. (a) LW1-1, 2027.25 m: poikilotopic, blocky calcite filling most primary pores; (b) LW1-1, 2037.5 m: dolomite filling intergranular primary pores with zoning and engulfed by ankerite; (c) LW1-2, 2563.5 m: calcite replaced by ferrocalcite; (d) LW1-2, 2563.5 m: quartz overgrowths replaced by ankerite; (e) LW1-1, 2037.5 m: dolomite engulfed by ankerite; (f) LW1-2, 2429.5 m: siderite precipitated around detrital grains. Note: Cc = Calcite, Do = Dolomite, Fc = Ferroan calcite, An = Ankerite, FD = Feldspar dissolution pore, Qa = Quartz overgrowth, Sid = Siderite.

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