Key factors affecting hydrocarbon accumulation in ancient dolomite gas reservoirs of Xixiangchi formation (Southern Sichuan Basin, China)

The Upper Cambrian Xixiangchi Formation in the Southern Sichuan Basin, China, has favorable hydrocarbon accumulation conditions. factors and enrichment conditions of this formation were key considerations study. By analyzing core, thin section, seismic, geochemical data, research shows that there are many sets granular crystalline dolomite reservoirs vertically, with thickness single-reservoir. During transformation karst tectonism, dissolution pores fractures developed to form an ideal reservoir space. is connected Lower source rock through a fault system. high-energy shoal facies located on oil gas migration path, providing appropriate space for forming configuration relationship between lower generation upper reservoir. affecting sufficient supply, development inherited paleo-uplift, effective transportation system, reservoir-forming combination. paleo-uplift controls distribution reservoirs. Owing short distance gas, found near accumulation, slope area should be targeted exploration future studies.