鄂尔多斯盆地致密油地质特征及其分布规律

Research on Dense Oil Geologic Characteristics and Distribution Regularity in Ordos Basin

鄂尔多斯盆地延长组长7段发育湖相富有机质页岩、泥岩,分布面积达6×104 km2,其热演化程度适宜,分布广、厚度大、有机碳含量高,储层致密但天然裂缝发育,含油饱和度高,致密油勘探潜力大。综合研究表明,沉积相带控制储层的发育,生烃中心控制了致密油的分布,有效的油气充注是致密油富集的关键。通过水平井和分段压裂技术的应用,可以实现致密油的工业开发。

At present the rapid development of dense oil exploration and development has attracted great attention in oil industry.Lacustrine organic-rich shale and mudstone have been found to be well developed in Chang 7 member of Yanchang formation in Ordos basin,with the distribution area of 6 x 104 km2 and has the characteristics of appropriate thermal evolution degree,large thickness,high organic carbon content and big dense oil exploration potential.Compared with the Bakken dense oil in Williston basin,except for obvious difference on sedimentary environment and formation pressure,good similarity has been found in structure characteristics,reservoir characteristics,hydrocarbon source rock properties,source storage configuration relations and fluid properties.Through the analysis and research on the basic geological characteristics and the enrichment regularity of dense oil in ordos basin,effective basis can be provided for the utilization of unconventional oil resources.