Geofluids / 2017 / Article / Tab 2

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.

WellsJS-1#W-113#Z-1#GS-1#

LocationsWestern margin of the sagEastern margin
Reservoir2nd member3rd and 4th members2nd and 3rd members2nd and 4th members
Porosity3.02%–4.05%1%–5%1%-2%2.45%–4.85%
Permeability0.0063–5.9317 mD0.1–1.92 m0.00225–88.2 mD1.005–8.02 mD
Bitumen contentNo1%~6%1%~5%1%~5%
Pore typeDissolved poreFracture and poreDissolved poreDissolved pore
Fracture density15.3/m24.75/m4.22/m1.4/m
Density of karst cave0.75/m1.3/m25/m11.4/m
Vugs-filling mineralsDolomiteDolomite-saddle dolomite-bitumenSaddle dolomite-bitumenSaddle dolomite-bitumen
Weathering karstWeakMediumStrongVery strong
Burial dissolutionWeakModerate strongStrongVery strong
Hydrothermal dissolutionWeakModerate strongStrongVery strong

(For locations, see Figure 1.)

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