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鄂尔多斯盆地吴定地区长6段储层特征及物性影响因素研究
作者单位:;1.西北大学地质学系·大陆动力学国家重点实验室
摘    要:通过铸体薄片、扫描电镜、高压压汞、X衍射等实验检测方法,开展了鄂尔多斯盆地吴定地区延长组长6段储层的物性研究,分析了沉积作用和成岩作用影响物性发育情况的规律。结果表明,研究区岩性主要为灰色细–极细粒长石砂岩,储集空间类型主要有原始粒间孔和长石溶孔,可将储层分为溶孔–粒间孔型储层、溶孔型储层及晶间微孔型储层。孔隙度与渗透率呈现正相关性,不同孔隙类型的孔隙度和渗透率有明显的分区现象。沉积作用和成岩作用共同主导着储层物性演化,沉积作用主要影响泥质含量,压实作用与孔隙度呈现负相关关系,胶结作用对物性有较为积极的改善,溶蚀作用在研究区不发育,对物性影响甚小。

关 键 词:鄂尔多斯盆地  长6段储层  成岩作用  储层特征

Reservoir characteristics and the influencing factors of physical properties of Chang 6 reservoirs in Wuding area,Ordos Basin
Abstract:By using casting thin sections,scanning electron microscopy(SEM),high pressure mercury injection,Xray diffraction and other experiment testing methods,the physical properties study of Chang 6 reservoirs in Wuding area,Ordos basin was carried out,and the deposition and diagenetic effects on physical development were analyzed.The results indicate the lithology of the study area is mainly of gray fine arkose sandstone,the reservoir space types are mainly of original intergranular pores and dissolved feldspar pores,and the reservoirs can be divided into three parts based on capillary pressure curve,namely dissolved-intergranular pore,dissolved pore and intergranular micropore.Porosity and permeability are positively correlated,and the porosity and permeability of different pore types have obvious different zoning.Sedimentation and diagenesis jointly affect the evolution of reservoir properties,the effect of sedimentation on reservoir physical properties is mainly due to the muddy content.Compaction has a negative correlation with porosity and the cementation has a good effect on the physical properties.The dissolution effect in the study area is not obvious,which has little effect on the physical properties.
Keywords:Ordos basin  Chang 6 reservoirs  diagenesis  reservoir characteristics
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