| Dissolution occurs at crest of anticline or at updip pinchout of a reservoir unit
| Dissolution occurs at crest of anticline or at updip pinchout of a reservoir unit
−
| CO<sub>2</sub> and/or organic acids generated during thermal maturation of organics seek structural or stratigraphic highs and generate acidic conditions
+
| CO<sub>2</sub> and/or organic acids generated during [[thermal maturation]] of organics seek structural or stratigraphic highs and generate acidic conditions
|-
|-
| Increased cementation occurs below oil-water or gas-water contacts
| Increased cementation occurs below oil-water or gas-water contacts