This study systematically reviews the development history and key technological breakthroughs of large gas fields in the Ordos Basin,and summarizes the development models of three gas reservoir types,low-permeability ...This study systematically reviews the development history and key technological breakthroughs of large gas fields in the Ordos Basin,and summarizes the development models of three gas reservoir types,low-permeability carbonate,low-permeability sandstone and tight sandstone,as well as the progress in deep coal-rock gas development.The current challenges and future development directions are also discussed.Mature development models have been formed for the three representative types of gas reservoirs in the Ordos Basin:(1)Low-permeability carbonate reservoir development model featuring groove fine-scale characterization and three-dimensional vertical succession between Upper and Lower Paleozoic formations.(2)Low-permeability sandstone reservoir development model emphasizing horizontal well pressure-depletion production and vertical well pressure-controlled production.(3)Tight sandstone gas reservoir development model focusing on single-well productivity enhancement and well placement optimization.In deep coal-rock gas development,significant progress has been achieved in reservoir evaluation,sweet spot prediction,and geosteering of horizontal wells.The three types of reservoirs have entered the mid-to-late stages of the development,when the main challenge lies in accurately characterizing residual gas,evaluating secondary gas-bearing layers,and developing precise potential-tapping strategies.In contrast,for the early-stage development of deep coal-rock gas,continuous technological upgrades and cost reduction are essential to achieving economically viable large-scale development.Four key directions of future research and technological breakthroughs are proposed:(1)Utilizing dual-porosity(fracture-matrix)modeling techniques in low-permeability carbonate reservoirs to delineate the volume and distribution of remaining gas in secondary pay zones,supporting well pattern optimization and production enhancement of existing wells.(2)Integrating well-log and seismic data to characterize reservoir spatial distribution of successive strata,enhancing drilling success rates in low-permeability sandstone reservoirs.(3)Utilizing the advantages of horizontal wells to penetrate effective reservoirs laterally,achieving meter-scale quantification of small-scale single sand bodies in tight gas reservoirs,and applying high-resolution 3D geological models to clarify the distribution of remaining gas and guide well placement optimization.(4)Further strengthening the evaluation of deep coal-rock gas in terms of resource potential,well type and pattern,reservoir stimulation,single-well performance,and economic viability.展开更多
Taking the Ordos Basin as an example,this paper proposed that the construction of an energy super basin should follow the principle of“more energy,less carbon,and better energy structure”.The modeling workflow of en...Taking the Ordos Basin as an example,this paper proposed that the construction of an energy super basin should follow the principle of“more energy,less carbon,and better energy structure”.The modeling workflow of energy super basin was built.Based on the resources/reserves,development status and infrastructures of the Ordos Basin,the development potential of the basin was evaluated,the uncertainties in the construction of energy super basin were analyzed,and the future vision and realization path of the Ordos Energy Super Basin were recommended.This study demonstrates that the Ordos Basin has the advantages of abundant energy sources,perfect infrastructures,well-matched carbon source and sink,small population density,and proximity to the energy consumption areas.These characteristics ensure that the Ordos Basin is a good candidate of the energy super basin.It is expected that the energy supply of the Ordos Basin in 2050 will reach 23×10^(8) t of standard coal,and the proportion of fossil fuels in energy supply will decrease to 41%.The carbon emissions will decrease by 20×10^(8) t compared to the emissions in 2023.The future construction of the basin should focus on the generation and storage of renewable energy,and technological breakthroughs for the carbon capture,utilization and storage.展开更多
文摘This study systematically reviews the development history and key technological breakthroughs of large gas fields in the Ordos Basin,and summarizes the development models of three gas reservoir types,low-permeability carbonate,low-permeability sandstone and tight sandstone,as well as the progress in deep coal-rock gas development.The current challenges and future development directions are also discussed.Mature development models have been formed for the three representative types of gas reservoirs in the Ordos Basin:(1)Low-permeability carbonate reservoir development model featuring groove fine-scale characterization and three-dimensional vertical succession between Upper and Lower Paleozoic formations.(2)Low-permeability sandstone reservoir development model emphasizing horizontal well pressure-depletion production and vertical well pressure-controlled production.(3)Tight sandstone gas reservoir development model focusing on single-well productivity enhancement and well placement optimization.In deep coal-rock gas development,significant progress has been achieved in reservoir evaluation,sweet spot prediction,and geosteering of horizontal wells.The three types of reservoirs have entered the mid-to-late stages of the development,when the main challenge lies in accurately characterizing residual gas,evaluating secondary gas-bearing layers,and developing precise potential-tapping strategies.In contrast,for the early-stage development of deep coal-rock gas,continuous technological upgrades and cost reduction are essential to achieving economically viable large-scale development.Four key directions of future research and technological breakthroughs are proposed:(1)Utilizing dual-porosity(fracture-matrix)modeling techniques in low-permeability carbonate reservoirs to delineate the volume and distribution of remaining gas in secondary pay zones,supporting well pattern optimization and production enhancement of existing wells.(2)Integrating well-log and seismic data to characterize reservoir spatial distribution of successive strata,enhancing drilling success rates in low-permeability sandstone reservoirs.(3)Utilizing the advantages of horizontal wells to penetrate effective reservoirs laterally,achieving meter-scale quantification of small-scale single sand bodies in tight gas reservoirs,and applying high-resolution 3D geological models to clarify the distribution of remaining gas and guide well placement optimization.(4)Further strengthening the evaluation of deep coal-rock gas in terms of resource potential,well type and pattern,reservoir stimulation,single-well performance,and economic viability.
基金Supported by Project of Science and technology of Petro China(2023YQX1032023ZZ25)Project of Science and technology of CNPC(2016DJ86)。
文摘Taking the Ordos Basin as an example,this paper proposed that the construction of an energy super basin should follow the principle of“more energy,less carbon,and better energy structure”.The modeling workflow of energy super basin was built.Based on the resources/reserves,development status and infrastructures of the Ordos Basin,the development potential of the basin was evaluated,the uncertainties in the construction of energy super basin were analyzed,and the future vision and realization path of the Ordos Energy Super Basin were recommended.This study demonstrates that the Ordos Basin has the advantages of abundant energy sources,perfect infrastructures,well-matched carbon source and sink,small population density,and proximity to the energy consumption areas.These characteristics ensure that the Ordos Basin is a good candidate of the energy super basin.It is expected that the energy supply of the Ordos Basin in 2050 will reach 23×10^(8) t of standard coal,and the proportion of fossil fuels in energy supply will decrease to 41%.The carbon emissions will decrease by 20×10^(8) t compared to the emissions in 2023.The future construction of the basin should focus on the generation and storage of renewable energy,and technological breakthroughs for the carbon capture,utilization and storage.
