【摘要】 基于煤系全油气系统具有“双源多储耦合、三场共存控藏、深层煤岩气（页岩气）—近源致密砂岩气（裂缝型致密气）—远源致密气/常规气—浅层煤层气有序成藏”的地质特征，为揭示中国西北地区侏罗系含煤盆地群的煤系全油气系统共性地质规律，通过解剖塔里木盆地库车坳陷和准噶尔盆地南缘冲断带煤系全油气系统结构、油气成藏等地质特征，指出西北地区侏罗系煤系全油气系统与华北地区石炭系—二叠系煤系全油气系统具有显著差异。西北侏罗系主要发育4类源储耦合成藏模式，包括构造型浅层—深层源外常规气、构造型深层—超深层源外致密气、近源/源内致密气、自生自储煤岩气等。研究认为，西北地区侏罗系是新特提斯洋被动大陆边缘巨型陆相沉积区，发育6个沉降带，煤系及煤岩发育具有区域统一性和盆地差异性，形成中国最大的中生界煤系分布区和巨型天然气聚集区。资源评价表明，西北地区侏罗系煤系全油气系统天然气资源量达30×10¹² m³，探明率仅11%，其中煤岩气资源量为17×10¹² m³，具有巨大的勘探潜力。塔里木盆地库车坳陷和西南坳陷、准噶尔盆地南缘、柴达木盆地北缘、吐哈盆地台北凹陷的深层、超深层致密气和煤岩气是未来重点勘探领域。更多还原

【Abstract】 Coal-measure whole petroleum system is generally featured by dual-source multi-reservoir coupling, coexistence of three dynamic fields controlling hydrocarbon accumulation, and sequential accumulation of deep coal-rock gas（shale gas）, proximal tight sandstone gas（fractured tight gas）, distal tight gas/conventional natural gas, and shallow coalbed methane. To reveal the common geological characteristics of coal-measure WPS in the Jurassic coal-bearing basins in Northwest China, this paper analyzes the geological characteristics of coal-measure WPSs in Kuqa Depression of Tarim Basin and Thrust Belt of Southern Junggar Basin, such as structure and hydrocarbon accumulation. It is pointed out that the Jurassic whole petroleum system of coal measures in northwestern China is significantly different from that of the Carboniferous–Permian in North China. Four types of source-reservoir coupling accumulation models are mainly developed in the Jurassic of Northwest China, including structural-type shallow to deep conventional gas outside the source, structural-type deep to ultra-deep tight gas outside the source, near-source/in-source tight gas, and self-generating and self-preserving coal-rock gas. It is indicated that the Jurassic strata in Northwest China belong to the giant continental sedimentary region on the passive continental margin of Neo-Tethys Ocean, including six subsidence zones, and containing coal measures and coal rocks that are consistent in the region but distinct from basin to basin. Thus, this region stands as the largest Mesozoic coal-measure area and a giant natural gas accumulation area in China. Resource assessment demonstrates that the Jurassic coal-measure WPS in Northwest China holds natural gas resources up to 30×10¹² m³, in which merely 11% has been proved, and coal-rock gas accounts for 17×10¹² m³, possessing a tremendous exploration potential. Deep and ultra-deep tight gas and coal-rock gas in Kuqa Depression and Southwestern Depression of Tarim Basin, southern margin of Junggar Basin, northern margin of Qaidam Basin, and Taipei Sag of Turpan-Hami Basin will serve as key natural gas exploration targets in the future.更多还原