本文選題：鄂爾多斯盆地　切入點：長6油層組　出處：《長安大學》2015年碩士論文　論文類型：學位論文

【摘要】：在研究區(qū)巖心觀察的基礎上,結合常規(guī)孔滲、鑄體薄片、常規(guī)壓汞等分析測試方法對安塞油田郝家坪油區(qū)長6油層組儲層特征進行精細研究,從沉積、成巖及構造等方面對油氣分布規(guī)律及主控因素進行探討,優(yōu)選有利區(qū)。研究區(qū)長6砂體成因類型以三角洲前緣亞相水下分流河道沉積,儲層巖石類型主要為細粒長石砂巖、長石巖屑砂巖,孔隙度平均值為10.5%,滲透率平均值為0.4×10-3μm2,是典型的低孔—特低滲儲層,儲層非均質性較強。研究區(qū)長6儲層孔隙組合主要以殘余粒間孔—溶蝕孔為主,儲層排驅壓力平均為1.35MPa,平均孔喉直徑為0.17μm,孔隙結構較差。儲層主要的成巖作用有壓實壓溶、膠結作用、溶蝕作用和交代作用,目前主要處于中成巖階段A期,局部進入了中成巖階段B期。郝家坪油區(qū)長6油層組油氣分布在縱向上和平面上均存在極度的不均衡性,油氣層的分布主要受控于骨架儲層砂體的沉積微相及物性差異,長6油藏為巖性油氣藏,受構造控制作用不明顯。通過油藏主控因素分析和油氣聚集規(guī)律研究,結合研究區(qū)沉積、構造、物性以及成巖相等特征進行綜合評價分類,優(yōu)選2個有利區(qū)。
[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.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.13

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本文編號：1631895