【摘要】 准噶尔盆地南缘钻到中下侏罗统烃源岩的探井较少,对其资源潜力认识不足.通过对单井地质地化、地震反演、沉积相和构造埋深等资料的综合分析,预测了烃源岩厚度、有机质丰度和有机质类型等的平面分布,采用生烃潜力法建立了中下侏罗统烃源岩的排烃模式,评价了其资源潜力,认为准噶尔盆地南缘下部成藏组合的油气具有重大勘探价值.结果表明:中下侏罗统烃源岩分布面积广、厚度大和有机质丰度较高,有机质类型以Ⅲ型和Ⅱ2型为主,处于成熟-高成熟演化阶段.泥岩和煤层的排烃门限对应镜质组反射率均为0.7%.烃源岩自白垩纪末期进入大量排烃期,在新近纪至现今阶段排烃量最大.总排烃量和远景资源量分别为140.27Gt和12.54Gt,其中石油与天然气的远景资源量分别为10.52Gt和2.28Tm3.综合分析认为,准噶尔盆地南缘中下侏罗统烃源岩排烃量大,为晚期排烃,具有良好的资源前景.更多还原

【Abstract】 There are a few exploration wells drilled through the Middle-Lower Jurassic source rock in the southern margin of Junggar basin.Thus,it is difficult to understand the resource potential.Based on the comprehensive analysis of geological and geochemical characteristics of single well,seismic inversion,sedimentary facies,tectonic burial depth,etc.,this paper predicts the horizontal distributions of the following aspects: the thickness of source rock,abundance and type of organic matter,etc.Further,utilizing the method of hydrocarbon generation potential establishes the hydrocarbon expulsion models of the Middle-Lower Jurassic source rock.Besides,this research evaluates the resource potential.Because of that,it is safe to conclude that it is of great significance to explore the lower oil and gas assemblage in the southern margin of Junggar basin.The results show that,source rocks in the Middle-Lower Jurassic distribute widely,with huge thickness and relatively high abundance of organic matter;the main types of organic matter are mainly III and II2 which are in the mature-high mature evolution stage.The vitrinite reflectance,which is corresponding to hydrocarbon-expulsion threshold of mudstone and coal seam,is 0.7%.The source rocks began to enter into hydrocarbon expulsion period in the late Cretaceous,and peak value of the hydrocarbon expulsion is from Neogene to present.The total quantities of hydrocarbon expulsion and perspective resources are 140.27 Gt and 12.54 Gt,respectively.Specifically,the oil resources is 10.52 Gt,and the gas resources is 2.28 Tm3.In general,source rocks in the Middle-Lower Jurassic have expulsed large amounts of hydrocarbons,and the source rocks expelled hydrocarbon in the late period,indicating a promising resource prospect.更多还原