The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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AAPG Bulletin; Year: 2025; Issue: July DOI: 10.1306/06132522006
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Figure 5. Typical pore types and dissolution in the sandstone reservoirs of the third interval of the Paleogene Shahejie (Es3) in the Bonan oil field. (A) Intragranular pores formed by the dissolution of quartz (Q) and lithic fragment (R) and the development of kaolinite (Kao; plane-polarized light). (B) Dissolved grains surrounded by bitumen and mold pore caused by the dissolution of feldspar (F; plane-polarized light). (C) Intragranular pores due to the dissolution of F and calcite (Cal) and development of quartz overgrowth (Qc; plane-polarized light). (D) Dissolution along fractures in grains, dissolved F and R, and the dissolution of Qc (plane-polarized light). Ank = ankerite; Es3l = lower part of Es3; Es3m = middle part of Es3; Es3u = upper part of Es3; M = clay; Pp = primary pore; Sp = secondary pore.
Figure 5. Typical pore types and dissolution in the sandstone reservoirs of the third interval of the Paleogene Shahejie (Es3) in the Bonan oil field. (A) Intragranular pores formed by the dissolution of quartz (Q) and lithic fragment (R) and the development of kaolinite (Kao; plane-polarized light). (B) Dissolved grains surrounded by bitumen and mold pore caused by the dissolution of feldspar (F; plane-polarized light). (C) Intragranular pores due to the dissolution of F and calcite (Cal) and development of quartz overgrowth (Qc; plane-polarized light). (D) Dissolution along fractures in grains, dissolved F and R, and the dissolution of Qc (plane-polarized light). Ank = ankerite; Es3l = lower part of Es3; Es3m = middle part of Es3; Es3u = upper part of Es3; M = clay; Pp = primary pore; Sp = secondary pore.