Coal-measure gas is the natural gas generated by coal, carbonaceous shale, and dark shale in coal-measure strata. It includes resources of continuous-type coalbed methane (CBM), shale gas and tight gas reservoirs, and...Coal-measure gas is the natural gas generated by coal, carbonaceous shale, and dark shale in coal-measure strata. It includes resources of continuous-type coalbed methane (CBM), shale gas and tight gas reservoirs, and trap-type coal-bearing gas reservoirs. Huge in resources, it is an important gas source in the natural gas industry. The formation and distribution characteristics of coal-measure gas in San Juan, Surat, West Siberia and Ordos basins are introduced in this paper. By reviewing the progress of exploration and development of coal-measure gas around the world, the coal-measure gas is confirmed as an important strategic option for gas supply. This understanding is mainly manifested in three aspects. First, globally, the Eurasian east-west coal-accumulation belt and North American north-south coal-accumulation belt are two major coal-accumulation areas in the world, and the Late Carboniferous–Permian, Jurassic and end of Late Cretaceous–Neogene are 3 main coal-accumulation periods. Second, continuous-type and trap-type are two main accumulation modes of coal-measure gas;it is proposed that the area with gas generation intensity of greater than 10×10^8 m^3/km^2 is essential for the formation of large coal-measure gas field, and the CBM generated by medium- to high-rank coal is usually enriched in syncline, while CBM generated by low-rank coal is likely to accumulate when the source rock and caprock are in good configuration. Third, it is predicted that coal-measure gas around the world has huge remaining resources, coal-measure gas outside source is concentrated in Central Asia-Russia, the United States, Canada and other countries/regions, while CBM inside source is largely concentrated in 12 countries. The production of coal-measure gas in China is expected to exceed 1000×10^8 m^3 by 2030, including (500–550)×10^8 m^3 conventional coal-measure gas,(400–450)×10^8 m^3 coal-measure tight gas, and (150–200)×10^8 m^3 CBM.展开更多
In recent years,major exploration breakthroughs and subsequent booming development of marine shale gas in both Upper Ordovician Wufeng and Lower Silurian Longmaxi Fms in the Sichuan Basin and its periphery highlight t...In recent years,major exploration breakthroughs and subsequent booming development of marine shale gas in both Upper Ordovician Wufeng and Lower Silurian Longmaxi Fms in the Sichuan Basin and its periphery highlight the strategic importance for the theoretical innovation and technological advances of gas in China.A number of key theories and technologies,such as continuous hydrocarbon accumulation and horizontal well volume fracturing,and so on,have contributed to the large-scale development of shale gas fields such as Shunan,Fuling,etc.,in Sichuan Basin.Based on China's geological conditions,industrial practices and current limitations in executing the full-scale development of shale gas,a new concept called“volume development(VD)”has been proposed.Under the framework of this theory,manmade volumetric fracture network systems are established through the combination of horizontal well drilling and transverse hydraulic fracturing through which gas flow become much more efficient due to the lateral flow superimposed by vertical fracture flow.VD has become a very efficient development model for shale gas because it can make gas in the volume affected by the man-made fracture network system become commercial reserves,and be produced more cost-effectively.VD includes five core technologies,i.e.comprehensive evaluation of“sweet areas”,optimization design of well patterns for volume development,optimization and trajectory design of horizontal well drilling in target window,massive fracturing technology for horizontal wellbores,design of production system and platform-based well factory-like management.The VD theory and technology provides important theoretical basis and technical support not only for the present three-dimensional development of shale gas in Changning,Fuling and other nearby blocks,but for the overall utilization of unconventional oil and gas resources such as continental,transitional shale gas.It is believed that VD will have broad application prospects in shale gas development.展开更多
基金Supported by the National Key Basic Research and Development Program(973 Program),China
文摘Coal-measure gas is the natural gas generated by coal, carbonaceous shale, and dark shale in coal-measure strata. It includes resources of continuous-type coalbed methane (CBM), shale gas and tight gas reservoirs, and trap-type coal-bearing gas reservoirs. Huge in resources, it is an important gas source in the natural gas industry. The formation and distribution characteristics of coal-measure gas in San Juan, Surat, West Siberia and Ordos basins are introduced in this paper. By reviewing the progress of exploration and development of coal-measure gas around the world, the coal-measure gas is confirmed as an important strategic option for gas supply. This understanding is mainly manifested in three aspects. First, globally, the Eurasian east-west coal-accumulation belt and North American north-south coal-accumulation belt are two major coal-accumulation areas in the world, and the Late Carboniferous–Permian, Jurassic and end of Late Cretaceous–Neogene are 3 main coal-accumulation periods. Second, continuous-type and trap-type are two main accumulation modes of coal-measure gas;it is proposed that the area with gas generation intensity of greater than 10×10^8 m^3/km^2 is essential for the formation of large coal-measure gas field, and the CBM generated by medium- to high-rank coal is usually enriched in syncline, while CBM generated by low-rank coal is likely to accumulate when the source rock and caprock are in good configuration. Third, it is predicted that coal-measure gas around the world has huge remaining resources, coal-measure gas outside source is concentrated in Central Asia-Russia, the United States, Canada and other countries/regions, while CBM inside source is largely concentrated in 12 countries. The production of coal-measure gas in China is expected to exceed 1000×10^8 m^3 by 2030, including (500–550)×10^8 m^3 conventional coal-measure gas,(400–450)×10^8 m^3 coal-measure tight gas, and (150–200)×10^8 m^3 CBM.
基金supported by the National Science and Technology Major Project of the Ministry of Science and Technology of China“Shale Gas Reservoir Engineering and Gas Production Technology”(No.:2016ZX05037)“Shale Gas Formation and Enrichment Conditions in the Sichuan Basin and its Periphery and the Prospect Evaluation Technology and its Application”(No.:2017ZX05035).
文摘In recent years,major exploration breakthroughs and subsequent booming development of marine shale gas in both Upper Ordovician Wufeng and Lower Silurian Longmaxi Fms in the Sichuan Basin and its periphery highlight the strategic importance for the theoretical innovation and technological advances of gas in China.A number of key theories and technologies,such as continuous hydrocarbon accumulation and horizontal well volume fracturing,and so on,have contributed to the large-scale development of shale gas fields such as Shunan,Fuling,etc.,in Sichuan Basin.Based on China's geological conditions,industrial practices and current limitations in executing the full-scale development of shale gas,a new concept called“volume development(VD)”has been proposed.Under the framework of this theory,manmade volumetric fracture network systems are established through the combination of horizontal well drilling and transverse hydraulic fracturing through which gas flow become much more efficient due to the lateral flow superimposed by vertical fracture flow.VD has become a very efficient development model for shale gas because it can make gas in the volume affected by the man-made fracture network system become commercial reserves,and be produced more cost-effectively.VD includes five core technologies,i.e.comprehensive evaluation of“sweet areas”,optimization design of well patterns for volume development,optimization and trajectory design of horizontal well drilling in target window,massive fracturing technology for horizontal wellbores,design of production system and platform-based well factory-like management.The VD theory and technology provides important theoretical basis and technical support not only for the present three-dimensional development of shale gas in Changning,Fuling and other nearby blocks,but for the overall utilization of unconventional oil and gas resources such as continental,transitional shale gas.It is believed that VD will have broad application prospects in shale gas development.
