准噶尔盆地陆梁隆起西部地区油气沿不整合面运移的规律

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

通过古地势图、演化剖面、地化资料,对准噶尔盆地陆西地区佳木河组顶界、二叠系顶界、三叠系顶界、西山窑组顶界和侏罗系顶界5个不整合面上油气运移大方向进行了确定。再通过统计各个单井不整合面上、下的试油、录井及地化资料,进一步厘定油气在每个不整合面上的运移区域。研究认为:二叠系各层系顶界和三叠系顶界不整合面上油气的运移仅发生于陆西斜坡区;侏罗系西山窑组顶界和侏罗系顶界不整合面上油气的运移主要发生在陆梁隆起区。这一规律可指导陆西地区油气的勘探部署,尤其是宏观与微观结合分析确定油气沿不整面运移范围,对确定油气分布方向有指导意义。

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.