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

The Cambrian Longwangmiao gas reservoirs in the Moxi area of Sichuan Basin have a complex associated accumulation history. Based on core and thin section examination, fluid inclusion analyses 1-D burial-thermal modelling, diagenetic evolution hydrocarbon processes Formation been reconstructed. Various events were identified, making up complete pore fill sequence as follows: solid bitumen/dolomite? nonfluorescent bitumen ? dolomite quartz/yellow fluorescent oily residual hole. Analyses oil inclusions bitumen-bearing are key to understanding processes. Th values aqueous that contemporaneous with range from 74.3 214.3°C. In conjunction history modelling results, results indicate there two stages charge three natural carbonate reservoirs. occurred Late Silurian Middle Triassic, respectively. Three Jurassic Early Cretaceous,