【摘要】 以陕北斜坡东南部D地区为研究对象,对影响长8段储层油藏分布的沉积相、岩石相、岩石物理相等主控要素的分布特征及其与致密砂岩油分布的关系进行了研究,分析总结了长8段致密砂岩油藏分布的相控作用及其模式。结果表明:研究区长8段储层发育的油层多为被致密砂体或泥岩包围的薄油层,石油呈叠置连片的准连续分布。鄂尔多斯盆地延长组长8段储层的石油分布主要受沉积相的控制,石油主要分布在砂体厚度和砂地比均较大的优相区;沉积颗粒较粗的细砂岩及以上级别的优质砂岩类地层控制着长8段储层的石油富集与成藏;相对高孔渗的优质储层控制着长8段储层石油的富集部位;优相带内致密岩体背景下的相对高孔渗砂体为鄂尔多斯盆地延长组长8段储层石油聚集的最有利位置。更多还原

【Abstract】 Taking D area in the southeast of northern Shaanxi slope as the research object,the distribution characteristics of sedimentary facies,lithofacies and lithophysical facies which affect the distribution of reservoir in Chang 8 Member and their relationship with the distribution of tight sandstone oil are studied,and the facies controlling effect of the distribution of tight sandstone oil in Chang 8 Member and its model are analyzed and summarized.The results show that oil-bearing layers in Chang 8 member of the study area are mostly thin oil layers surrounded by compact sandbody or mudstone,and they are overlapping quasi-continuous distribution.The oil distribution of the Chang 8 reservoir is mainly controlled by sedimentary facies,and oil is mainly distributed in the high-quality facies areas with larger sand body thickness and sand-land ratio.The fine sandstone with coarse sedimentary grains and high quality sandstone control the oil enrichment and accumulation of Chang 8 reservoir.The high quality reservoirs with relatively high porosity and permeability control the oil enrichment position of Chang 8 reservoir.The relatively high porosity and permeability sand body in the compact rock of the high-quality facies zone is the most favorable position for oil accumulation in Chang 8 member of Yanchang Formation in Ordos Basin.更多还原