Research Article
The Early Cambrian Mianyang-Changning Intracratonic Sag and Its Control on Petroleum Accumulation in the Sichuan Basin, China
Table 3
Differential diagenesis of Early Cambrian Longwangmiao Formation across the intracratonic sag.
| Well | JS-1 | GS-17 | MX-12 |
| Location | Western margin of sag | Center of sag | Eastern margin | Lithology | Crystalline dolomite | Dolomitic grainstone, crystalline dolomite | Dolomitic grainstone | Mudstone recrystallization | No | Weak | Weak | Dolomitization | Strong | Strong | Strong | Cementation | Weak | Moderate | Strong | Freshwater karstification | Weak | Moderate | Strong | Compaction, pressure solution | Moderate | Moderate | Moderate | Recrystallization | Strong | Strong | Strong | Epigenic karstification | Weak | Moderate to strong | Moderate | Hydrothermal dolomite | Moderate | Strong | Moderate | First charging of hydrocarbon and bitumen | No | Moderate | Strong | Second charging of hydrocarbons | No | Moderate | Strong |
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(For locations, see Figure 1.)
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