泌阳凹陷北部斜坡带三角洲沉积特征与油气成藏研究

Study on delta system and reservoir-forming characteristics on the north slope of Biyang depression

泌阳凹陷北部斜坡带特殊的构造背景决定了三角洲发育的广泛性和类型的多样性。通过对侯庄、杨楼辫状河和张厂、古城曲流河三角洲的成因及沉积相研究认为,辫状河沉积体的储集性能优于曲流河三角洲。油气勘探实践表明,辫状河三角洲油层主要分布于河口坝微相中,其次为远砂坝微相,水下分流河道则以油、水同层和水层居多,而曲流河三角洲砂体虽然成层性好,孔隙度较发育,但砂体厚度远小于辫状河三角洲,发育在曲流河三角洲上的油气藏产量也相对较低。

The special structural setting on the north slope of Biyang Depression decided the wide and multiple types of delta development. Sedimentary study of Houzhuang and Yanglou braided river and Zhangchang and Gucheng meandering river indicates that the reservoir property of braided river sedimentation is better than that in meandering river delta. Braided river delta reservoirs mainly distribute in river mouth bar micro facies, then in distal bar micro facies. Sands in meandering river delta have good stratification and porosity, but are much thinner than sands in braided river delta. The production of reservoirs in meandering river delta is relatively low.