The geology of hydrocarbon reservoirs in the Xinchang gas field, West Sichuan depression

Eight gas pools are hosted in the Xinchang gas field in Deyang,western Sichuan,which is known as the largest gas field found in dense sandstones in China.The research on the geology, diagenesis and reservoir quality of the reservoir sandstones in the gas field has disclosed that secondary and residural intergranular spores and solution openings may serve as main pore spaces.The natural gas may pass through most of the pore throats of the sandstones,and tend to be accumulated commonly in the localities where there are large discrepancies physically or in pore types of the reservoir rocks.Therefore the emphasis on the future research should be shifted from the highly permeable zones to the physically different zones.