四川盆地大庆探区油气勘探开发进展及前景展望OA北大核心CSTPCD

There are a series of marine and a series of continental oil-bearing strata developed in Sichuan Basin,with enormous oil and gas resources potential but relatively low proved ratio.In response to new situation of petro-leum reform,some blocks of Sichuan Basin were successively transferred to Daqing Oilfield Company in 2017-2018.In recent years,Daqing Oilfield Company has continuously broken through ideological barriers in Sichuan and Chongqing region,emphasizing simultaneous exploration on both marine and continental oil and gas,persever-ing in overcoming difficulties,deepening understanding,and achieving a series of remarkable progress.By the end of 2023,proved gas in place of marine Lower Permian strata was submitted cumulatively to 1 114.59×108 m3.Mean-while,it is planned to submit cumulative proved gas in place of Lower Permian strata to 3 000×108 m3 during the 14th Five-Year Plan(2021-2025)to 15th Five-Year Plan(2026-2030),laying solid foundation for reserves and production increase of Daqing exploration area.Continental Lianggaoshan Formation has conditions for large-area shale oil enrichment and accumulation,with petroleum resources of 26.75×108 t and natural gas resources of 1.7×108 m3,demonstrating large-scale exploration scene with hundred-million-tons reserves and is the most realistic area for finding large-scale reserves.Continental Xujiahe Formation has good source-reservoir assemblage for tight gas,with vertically superimposition,forming large-area continuous tight gas reservoirs.Predicted cumulative favorable area is approximately 6 200 km²,with resources of 3.15×1012 m3,demonstrating resources potential of trillion cubic meters and representing a future realistic field for large-scale reserves and production increase in Daqing explora-tion area of Sichuan Basin.