安塞谭家营油区长6油藏储层综合评价及油气富集规律

发布时间：2018-07-28 21:46

【摘要】：在研究区岩心观察的基础上,结合常规孔渗、铸体薄片、常规压汞等分析测试方法,对安塞油田谭家营油区长6油藏储层特征进行精细研究,在储层综合评价的基础上,从沉积、成岩及构造等方面对长6油藏油气富集规律进行研究,优选有利区。安塞谭家营油区长6油层组顶面构造主体为西倾单斜,仅在单斜背景上发育数排鼻状隆起带。研究区长6砂体成因类型主要为三角洲前缘亚相水下分流河道沉积。储层岩石类型以细粒长石砂岩为主,孔隙度平均值为9.0%,渗透率平均值为0.85×10-3μm2,为典型低孔—特低渗透储层,储层具有弱亲油特征,油水相对渗透率交叉点的含水饱和度变化范围大,油水两相同时流动的含水饱和度范围窄。储层进行分类评价结果表明,本区长6储层主要为IIIa类和IIIb类储层,占各类储层总和的83.3%左右,非储层所占比例较小,为16.7%。安塞谭家营油区长6油气分布在纵向上和平面上均存在不均衡性,骨架砂体的岩性分布和遮挡控制了油气的分布规律,而顶面构造对油气的分布具有微弱控制作用。在油气富集规律研究的基础上,分小层优选有利目标区,为下步产能建设提供科学依据。
[Abstract]:On the basis of core observation in the study area, combined with conventional pore permeability, casting thin slice, conventional mercury injection and other analytical and testing methods, the reservoir characteristics of Chang 6 reservoir in Tan Jia Ying oil area, Ansai Oilfield, are studied in detail, and on the basis of comprehensive reservoir evaluation, The oil and gas enrichment law of Chang 6 reservoir is studied from the aspects of sedimentation, diagenesis and structure. The top structure of Chang 6 oil formation in Anshitanjiaying oil area is mainly inclined to the west, and several rows of nasal uplift zones are developed only in the monoclinal background. The genetic types of Chang 6 sand bodies in the study area are mainly delta front subfacies subaqueous distributary channel deposition. The reservoir rock type is mainly fine feldspathic sandstone, the average porosity is 9.0 and the average permeability is 0.85 脳 10 ~ (-3) 渭 m ~ (2). It is a typical low-porosity and ultra-low permeability reservoir. When oil and water are the same, the range of water saturation is narrow. The results of reservoir classification and evaluation show that Chang 6 reservoirs in this area are mainly IIIa and IIIb reservoirs, accounting for about 83.3% of the total of all kinds of reservoirs, and the proportion of non-reservoirs is relatively small (16.7g). The distribution of oil and gas in Chang-6 oil area of Ansai Tanjiaying oil area is unbalanced both vertically and horizontally. The lithologic distribution and occlusion of the framework sand body control the distribution of oil and gas, while the top structure has a weak control effect on the distribution of oil and gas. On the basis of the study on the law of oil and gas enrichment, the favorable target area is selected in small layers, which provides the scientific basis for the next step of productivity construction.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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