Abstract: The distribution of oil and water in Xia 9 wellblock of Jugger Basin was characterized by oil existing in lower parts and water existing in higher parts of the structures,where there were no shadings on the up-dip of nose-like upper bend.The comprehensive research on the distribution of oil and water,diagenism,3D variations of reservoir properties,structural styles and evolution showed that the diagenetic shading was the key factor to control the distribution of oil and water in Xia 9 wellblock of Jugger Basin.The oil reservoir in Xia 9 wellblock has the properties of subtle oil reservoirs.The intensity of diagenetic shading controlled oil-gas accumulation and the scale of accumulation,while the physical conditions of reservoir controlled the intensity of diagenetic shading.The accumulation scale had a negative correlation to the physical condition of reservoir.As the physical condition got better,the accumulation scale became smaller or finally disappeared.

Key words: Jungger Basin, diagenetic shading intensity, oil and gas accumulation, reservoir property, subtle oil reservoir

摘要： 对准噶尔盆地夏9井区油水分布现状及成岩作用、储集物性纵横向变化规律、构造样式及其变化等的综合研究表明,成岩遮挡是控制夏9井区油水分布的关键因素,准噶尔盆地夏9井区成岩圈闭油藏是一种独具特征的隐蔽油藏。成岩遮挡的强度决定着油气能否成藏和成藏的规模,而遮挡强度又取决于储层的物性条件。物性条件越好,遮挡强度越低,故成藏规模与储集物性成负相关关系。随着物性变好,成藏规模越来越小,以致最后不能成藏。

关键词: 准噶尔盆地, 成岩遮挡强度, 油气成藏, 储层物性, 隐蔽油藏