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从储集层地质发育特征、岩石组成与成岩作用、物性与孔隙类型等方面,分析了鄂尔多斯盆地胡尖山地区上三叠统延长组长6—长4+5段砂岩储集层的特殊性,对储集层特征与石油聚集的关系进行了探讨。砂体主要发育于三角洲前缘亚相中的水下分流河道微相中,具有较强的非均质性。砂岩以长石岩屑细砂岩为主,成岩作用较强,物性总体较低,多为低孔低渗—致密储集层,有效孔隙类型主要为粒间孔、溶蚀孔隙和晶间孔。石油在不同物性的储集层中均有聚集,含水层多具有较高的孔隙度和渗透率,所以,储集层本身特征对石油的聚集不起决定性作用,还必须要有一定厚度的物性较好的储集层、输导通道与油源的良好配置才可能形成油藏。
This paper analyzes the peculiarities of sandstone reservoirs of Chang-4 + 5 Member of Upper Triassic Yanchang Formation in Hujian Mountain area, Ordos Basin, from the aspects of geological development, rock composition and diagenesis, physical properties and pore types of reservoirs. The relationship between reservoir characteristics and oil accumulation is discussed. The sand body mainly develops in the underwater distributary channel microfacies in the delta front subfacies, which has strong heterogeneity. Sandstone is mainly composed of feldspar cuttings and fine sandstone, with strong diagenesis and lower overall physical properties. Most of them are low porosity and low permeability - tight reservoirs. The effective pore types are mainly intergranular pores, dissolved pores and intergranular pores. Petroleum accumulates in reservoirs of different physical properties. Aquifer has more porosity and permeability. Therefore, the characteristics of the reservoir itself are not critical to the oil accumulation, and must have a certain thickness of physical properties Better reservoirs, good alignment of the transport channels and oil sources make it possible to form a reservoir.