OIL AND GAS MIGRATION ALONG UNCONFORMITY IN LUXI AREA, JUNGGAR BASIN

The main direction of oil and gas migration at 5 unconformable surfaces, including top boundaries of Jiamuhe Formation, Permian, Triassic, Xishanyao Formation and Jurassic in Luxi area of Junggar Basin, is confirmed by palaeo-chorography, evolutionary profile and geochemical data. Subsequently, the migration area at every unconformable surface is determined by formation test, mud logging and geochemical data obtained from the upper and lower surfaces of individual well. This paper concludes that oil and gas migration at unconformable surfaces on top boundaries of Permian and Triassic only occurred in Luxi slope area and mainly in Luliang uplift for top boundaries of Jurassic Xishanyao Formation and Jurassic. That regularity may guide the exploration in Luxi area. Especially, determining oil and gas migration scope along unconformable surfaces by macro and micro methods gives an important reference for determining hydrocarbon distribution.