Abstract:

Middle-Lower Jurassic coal measures are the main source rocks of gas pools in Junggar Basin; sand bodies, faults and uncomfomities are migration pathways; the upper parts of Sangonghe and Badaohe Formations are regional cover rocks. Several hydrocarbon migration-accumulation systems could be divided within the basin such as Mosowan-Shixi migration-accumulation system containing gas pools of middle-lower abundance; Shihezi-Hutubi migration-accumulation system in which important hydrocarbon discovery might be found; Dixi-Fukang system in which Saogonghe Formation Gasfield was discovered and northeast Fukang region may be another favourable area; Xiaoguai-Chepaizi and Mahe systems which are less favourable for gas accumulation. In summary, two types of primary and residual secondary gas pools including 4 subtypes were found in Jurassic System in Jurassic Basin.

Key words: Middle-Lower Jurassic, coal measures, gas pool, migration-accumulation system, Junggar Basin