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Pore type | Cause | Distribution characteristics | Filling situation |
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Primary pores | Stomata | Gas expansion and contraction | Partially covered by chlorite and turbidite | Partially covered by chlorite and turbidite |
Amygdala, inner hole | Remaining pores in amygdala formed by mineral-filled stomata that are not filled | Calcite fill | Calcite fill |
Intracrystalline pores, matrix pores | Diagenetic compaction among pyroclastic particles | Partially filled with turbidite, followed by chlorite and calcite | Partially filled with turbidite, followed by chlorite and calcite |
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Secondary pores | Dissolution pores | Pores formed by dissolution and dissolution under the action of hydrothermal fluid | Filling, poor connectivity, little contribution to reservoir physical properties | Filling, poor connectivity, little contribution to reservoir physical properties |
Intergranular pores | Tiny pores formed by clay mineralization, recrystallization, and dissolution | Unfilled and oily | Unfilled and oily |
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Crack | Tectonic seam | Ground stress | Half-filled | Half-filled |
Dissolution seam | Weathering leaching erosion | Half-filled and communicating matrix pores | Half-filled and communicating matrix pores |
Condensation shrinkage joints | Cold shrink differential movement | Calcite full to half filling | Calcite full to half filling |
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