Fluid Inclusion Evidence for Oil Charge and Cracking in the Cambrian Longwangmiao Dolomite Reservoirs of the Central Sichuan Basin, China

Figure 4

The Longwangmiao Formation, Well MX20 (4597.29-4598.73 m,). Cores and thin sections with associated petrological observations. (D1) core sample, high-angle cracks in muddy microcrystalline dolomite filled with solid asphalt+dolomite veins. (D2) Thin section showing partially/fully filled cracks and dissolution holes in asphalt. (D3) (-) and (D4) (CL) Pore fill types identified in cracks and dissolution pores included the following: solid asphalt → dolomite. (-): single-polarized light; CL: cathodoluminescence; UV: fluorescence.