安塞郝家坪油区长6油层组储层特征及油气富集规律研究

发布时间：2018-03-19 00:01

本文选题：鄂尔多斯盆地　切入点：长6油层组　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【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郝家坪油区长6油层组储层特征进行精细研究,从沉积、成岩及构造等方面对油气分布规律及主控因素进行探讨,优选有利区。研究区长6砂体成因类型以三角洲前缘亚相水下分流河道沉积,储层岩石类型主要为细粒长石砂岩、长石岩屑砂岩,孔隙度平均值为10.5%,渗透率平均值为0.4×10-3μm2,是典型的低孔—特低渗储层,储层非均质性较强。研究区长6储层孔隙组合主要以残余粒间孔—溶蚀孔为主,储层排驱压力平均为1.35MPa,平均孔喉直径为0.17μm,孔隙结构较差。储层主要的成岩作用有压实压溶、胶结作用、溶蚀作用和交代作用,目前主要处于中成岩阶段A期,局部进入了中成岩阶段B期。郝家坪油区长6油层组油气分布在纵向上和平面上均存在极度的不均衡性,油气层的分布主要受控于骨架储层砂体的沉积微相及物性差异,长6油藏为岩性油气藏,受构造控制作用不明显。通过油藏主控因素分析和油气聚集规律研究,结合研究区沉积、构造、物性以及成岩相等特征进行综合评价分类,优选2个有利区。
[Abstract]:On the basis of core observation in the study area, the reservoir characteristics of Chang 6 formation in Hao Jiaping oil area of Ansai Oilfield were studied by combining with conventional pore permeability, casting thin slice, conventional mercury injection and other analytical and testing methods, and the reservoir characteristics of Chang 6 formation in Hao Jiaping oil area, Ansai Oilfield, were studied from sedimentation. In diagenesis and structure, oil and gas distribution and main controlling factors are discussed and favorable areas are selected. The genetic types of Chang 6 sandbodies in the study area are delta front subfacies underwater distributary channel sedimentation, and the reservoir rock types are mainly fine feldspathic sandstone. The average porosity and permeability of feldspar lithic sandstone are 10.5 and 0.4 脳 10 ~ (-3) 渭 m ~ (2), respectively. It is a typical low-porosity and ultra-low permeability reservoir with strong heterogeneity. The average displacement pressure of reservoir is 1.35 MPA, the average pore throat diameter is 0.17 渭 m, and the pore structure is poor. The main diagenesis of reservoir are compaction pressure solution, cementation, dissolution and metasomatism. In the middle diagenesis stage B, the distribution of oil and gas in Chang 6 formation of Hao Jiaping oil area is extremely uneven in longitudinal and plane, and the distribution of oil and gas layer is mainly controlled by the difference of sedimentary microfacies and physical properties of sand body in skeleton reservoir. Chang 6 reservoir is lithologic reservoir, which is not controlled by structure. Through the analysis of main controlling factors of reservoir and the study of oil and gas accumulation law, combined with the characteristics of sedimentation, structure, physical property and diagenetic facies in the study area, the comprehensive evaluation and classification are carried out. Two favorable areas were selected.
【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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