Research Article
The Early Cambrian Mianyang-Changning Intracratonic Sag and Its Control on Petroleum Accumulation in the Sichuan Basin, China
Table 2
Reservoir features of the Ediacaran Dengying Formations across the intracratonic sag.
| | Wells | JS-1# | W-113# | Z-1# | GS-1# |
| | Locations | Western margin of the sag | Eastern margin | | Reservoir | 2nd member | 3rd and 4th members | 2nd and 3rd members | 2nd and 4th members | | Porosity | 3.02%–4.05% | 1%–5% | 1%-2% | 2.45%–4.85% | | Permeability | 0.0063–5.9317 mD | 0.1–1.92 m | 0.00225–88.2 mD | 1.005–8.02 mD | | Bitumen content | No | 1%~6% | 1%~5% | 1%~5% | | Pore type | Dissolved pore | Fracture and pore | Dissolved pore | Dissolved pore | | Fracture density | 15.3/m | 24.75/m | 4.22/m | 1.4/m | | Density of karst cave | 0.75/m | 1.3/m | 25/m | 11.4/m | | Vugs-filling minerals | Dolomite | Dolomite-saddle dolomite-bitumen | Saddle dolomite-bitumen | Saddle dolomite-bitumen | | Weathering karst | Weak | Medium | Strong | Very strong | | Burial dissolution | Weak | Moderate strong | Strong | Very strong | | Hydrothermal dissolution | Weak | Moderate strong | Strong | Very strong |
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(For locations, see Figure 1.)
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