准噶尔盆地二叠系全油气系统与源内天然气勘探新领域

为进一步拓展准噶尔盆地油气勘探领域，丰富和发展石油地质基础理论及认识，以近年来勘探实践为基础，总结现阶段油气勘探特点与发展趋势，分析了二叠系全油气系统及源内深层非常规天然气大规模成藏条件。结果表明，中—下油气成藏组合已成为勘探主体，深层具备油气聚集条件，烃源岩控制油气分布，形成了常规和非常规油气藏有序共存的分布模式。二叠系优质烃源岩持续供烃，是全油气系统形成的前提，并发育源内和源外2套油气成藏子系统，二叠系发育不同类型的源内储集层，具有大规模天然气，特别是非常规天然气的勘探潜力。这不仅拓宽了准噶尔盆地油气勘探领域，支撑从大油田建成大油气田，也对进一步完善全油气系统理论具有重要意义，深层源内非常规油气是未来富烃凹陷勘探的重要领域。

Total Petroleum System and Inner-Source Natural Gas Exploration in Permian Strata of Junggar Basin

In order to further expand the petroleum exploration and enrich the basic theory and understanding on petroleum geology in Junggar basin，based on the exploration practices in recent years，the characteristics of present petroleum exploration and its trend are summarized，and the total petroleum system in Permian strata and the conditions for large-scale accumulation of unconventional natural gas in inner-source deep strata are described. The results show that the middle and lower reservoir assemblages have become the major exploration targets，deep strata have the conditions for oil and gas accumulation，the source rock controls the distribution of oil and gas，and a distribution pattern with orderly coexistence of conventional and unconventional reservoirs is established. The continuous hydrocarbon supply from high-quality Permian source rocks is the premise for the formation of the total petroleum system，and two sets of oil and gas accumulation systems are found inside source and outside source. Various inner-source reservoirs are developed in the Permian strata，which have great potential for natural gas exploration，especially unconventional natural gas. The understanding not only broadens the petroleum exploration area in Junggar basin，but provides theoretical and practical support for construction of a large oil and gas field. Moreover，it is of great significance for further improving the theory of total petroleum system. Deep inner-source unconventional oil and gas are becoming an important frontier for future exploration in hydrocarbon-rich sags.