Abstract: Junggar Basin is rich in oil-gas resources. There are three sets of major source rocks of Carboniferous System, Permian System and Jurassic System. There are diverse types of reservoirs, including volcanic rock, conglomerate, sandstone and carbonate-type mixed rock. Among them, conglomerates distributed at the edges and slopes of hydrocarbon-rich sags in the basin are the main body for increasing reserves. There are three sets of regional mudstone cap rocks distributed in the basin, which are vertically stacked with the reservoir, thus dividing the basin into a three-decker structure and forming three major petroleum systems, i.e., the Carboniferous, Permian and Jurassic petroleum system. In recent years, through innovating geological understandings, highlighting risk exploration, strengthening intensive exploration and fine exploration, and exploring the sag center and source rocks, Junggar Basin has achieved substantial achievements in the exploration of deep and ultra-deep fields. Particularly, focusing on "new areas, new fields, new strata and new types", based on previous research work, a deep analysis is performed on accumulation conditions for petroleum systems, and efforts are made to innovate the understandings of hydrocarbon accumulation, involving "whole petroleum system", "coalbed methane from other source rocks", "Carboniferous self-generation and self-reservoir and new generating hydrocarbon in paleo-reservoir". Therefore, four important new breakthroughs have been made as below:natural gas of lower assemble in the southern margin thrust belt, whole petroleum system in Fengcheng Formation in the western depression, paleo-uplift around the hydrocarbon-rich sag, and Jurassic coalbed methane in the basin. Future exploration directions and key areas are pointed out by systematically summarizing recent exploration achievements, and comprehensively analyzing the characteristics of the field. It has been clarified that the basin should adhere to the comprehensive exploration idea of "equal emphasis on both conventional and unconventional resources, collaborative development of oil and gas, and whole petroleum system" in the future, focusing on the further exploration of natural gas of the southern middle-lower assemblage, deep/ultra-deep conventional structural trap and unconventional light hydrocarbons in the western depression, and Jurassic coalbed methane.

Key words: Junggar Basin, whole petroleum system, coalbed methane, shale gas, tight gas, deep and ultra-deep strata, exploration direction

摘要： 准噶尔盆地油气资源丰富，发育石炭系、二叠系和侏罗系3套主力烃源岩，储集层类型多样，岩性包括火山岩、砾岩、砂岩及碳酸盐岩型混积岩等，其中，分布于盆地富烃凹陷边缘及斜坡区的砾岩是盆地规模增储上产的主体。盆地发育3套区域性泥岩盖层，与储层呈纵向叠置，形成"三层楼"结构，并由此构建3大油气系统，即石炭系油气系统、二叠系油气系统和侏罗系油气系统。近年来，通过地质认识创新，突出风险勘探，强化集中勘探与精细勘探，准噶尔盆地"下凹进源"，走向深层—超深层领域的勘探取得了丰硕成果。围绕新区、新领域、新层系与新类型，通过继承前期研究工作、深化含油气系统成藏条件分析，创新了"全油气系统" "他源型煤层气" "石炭系自生自储与新生古储"等成藏认识，在南缘冲断带下组合天然气、西部坳陷风城组全油气系统、富烃凹陷周缘古隆起以及盆地内侏罗系煤层气4个领域取得了重要新突破。通过系统梳理近期的勘探新成果，综合分析各领域特征，指出了未来的勘探方向及重点领域，明确了盆地未来应坚持"常非并重、油气并举、全油气系统"的综合勘探思路，围绕准噶尔盆地南部中—下组合天然气、西部坳陷深层—超深层常规构造—非常规轻质油气以及侏罗系煤层气开展深化勘探。

关键词: 准噶尔盆地, 全油气系统, 煤层气, 页岩气, 致密气, 深层—超深层, 勘探方向