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AAPG Bulletin
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AAPG Bulletin; Year: 2025; Issue: July DOI: 10.1306/06132522006
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Figure 6. Typical compaction and quartz (Q) cementation in the third interval of the Paleogene Shahejie (Es3) sandstone reservoirs in the Bonan oil field. (A) Dissolved quartz grain surrounded by compacted clay (M) and mechanical compaction in clay-rich samples (orthogonal-polarized light). (B) Quartz overgrowth (Qc) constrained by calcite II (plane-polarized light). (C) Qc constrained by ankerite (Ank; orthogonal-polarized light). (D) Dissolved Qc (plane-polarized light). Cal II = second-phase calcite; Es3l = lower part of Es3; Es3m = middle part of Es3; Es3u = upper part of Es3; F = feldspar; R = lithic fragment.
Figure 6. Typical compaction and quartz (Q) cementation in the third interval of the Paleogene Shahejie (Es3) sandstone reservoirs in the Bonan oil field. (A) Dissolved quartz grain surrounded by compacted clay (M) and mechanical compaction in clay-rich samples (orthogonal-polarized light). (B) Quartz overgrowth (Qc) constrained by calcite II (plane-polarized light). (C) Qc constrained by ankerite (Ank; orthogonal-polarized light). (D) Dissolved Qc (plane-polarized light). Cal II = second-phase calcite; Es3l = lower part of Es3; Es3m = middle part of Es3; Es3u = upper part of Es3; F = feldspar; R = lithic fragment.