准噶尔盆地南缘前陆斜坡区新近系沙湾组油气成藏特征

摘要

In the foreland slope area of Junggar basin,Neogene Shawan Formation is a favorable target stratum to find"high-quality, efficient" petroleum geological reserves.Based on the analysis of the discovered Shawan reservoir charac-teristics and reservoir-forming regularity-,found that hydrocarbon accumulation of Shawan formation has three typical characteristics:(1)The thin oil reservoir have typical " Highlights" feature in Shawan Formation.On seismic attribute pro-files, thin oil reservoirs is characterized by strong amplitude of the highlights feature,which is the most effective deter-mining criterion to evaluating hydrocarbon traps target currently;(2).Petroleum abundance in the Shawan formation are determined by the shallow immigration channal of oil and gas;. The thinner does the deposition thickness for the creta-ceous, the more favorable for shallow fault link up the oil and gas.;(3)favorable accumulation areas for the heave oil are limited to the north of the Chepaizi uplift.%准噶尔盆地南缘前陆斜坡区新近系沙湾组是寻找优质、高效石油地质储量的有利目的层。通过对已发现的沙湾组油藏特征和成藏规律分析总结，梳理出沙湾组油气成藏3个显著特征：①沙湾组稀油油藏具典型的“亮点”特征。沙湾组稀油油藏在地震属性剖面上具强振幅的亮点特征，该特征是目前评价沙湾组圈闭目标含油气性的最有效判别依据；②浅层油气运移通道决定了斜坡区各段沙湾组油气丰度。前陆斜坡区白垩系沉积厚度是影响浅层油气运移难易的主要影响因素，白垩系沉积厚度越薄，就越有利于浅层断裂沟通油气，沙湾组油藏成藏可能性就越大；③沙湾组稠油成藏有利区仅限于车排子凸起北部。