鄂尔多斯盆地袁石洼地区储层特征研究

发布时间：2018-07-17 14:48

【摘要】：吴起袁石洼油区地层由上到下,其构造特点具有很好继承性,均表现为“东高、西低”的斜坡状构造特征。本油区延长组沉积特征表现为长10时期为湖进,长9-长8湖盆扩张,至长4+5、长6发育了三角洲前缘亚相沉积,长2、长1时发展为三角洲平原亚相,至延10时发展为河流相。综合研究表明,延长组主砂带随着砂体由东北向南西延伸,沉积相由河流相演变为三角洲平原,再由三角洲前缘相演变为浅湖相。据铸体薄片和扫描电镜观察分析,延10～长9油组砂岩储层孔隙类型主要为粒间孔,其次为粒内孔、长石溶孔,溶蚀微孔。对本区储层砂岩岩心分析物性资料及测井解释物性资料进行了统计分析,表明该区延安组砂岩属于中孔、中-低渗储层,延长组砂岩属于低孔、特低渗储层。对研究区单砂体层内、层间非均质及微观非均质性的研究表明,层内和层间非均质性以强非均质为主,但微观非均质性表现较弱。通过测井二次解释,结合试油结果,修正了渗透率大小和部分井的油水层结论,新的解释结果更接近实际生产反映。对72km2的工区延9、延10、长1、长2、长4+5、长6、长8、长9油组、小层的石油地质储量进行了估算,共计算石油地质储量3475.97×104t。其中,延安组483.46×104t；延长组2992.51×104m3。延长组油藏为中深层、特低孔隙、特低渗透、低产、特低丰度、中型油藏。
[Abstract]:From top to bottom, the structural characteristics of Wuqi Yuanshiwa oil area are characterized by good inheritance, which are characterized by "east high, west low" slope structure. The sedimentary characteristics of Yanchang formation in this oil area are characterized by lacustrine advance in Chang10 period, lacustrine basin extension from Chang9-Chang 8 to Chang 45, and delta front subfacies in Chang6, with delta plain subfacies in Chang 2, delta plain subfacies in Chang 1 and fluvial facies at 10:00. The comprehensive study shows that the main sand belt of Yanchang formation extends from northeast to southwest and sedimentary facies from fluvial facies to delta plain and then from delta front facies to shallow lacustrine facies. According to the observation and analysis of cast sheet and scanning electron microscope, the pore types of sandstone reservoir of Y10 ~ Chang9 oil group are mainly intergranular pore, followed by intragranular pore, feldspar dissolved pore and dissolved micropore. The physical property data of sandstone core analysis and log interpretation in this area are statistically analyzed. The results show that the sandstone of Yan'an formation in this area belongs to middle pore, middle low permeability reservoir, and Yanchang sandstone belongs to low porosity and very low permeability reservoir. The study on the heterogeneity and microscopic heterogeneity of the single sand body in the study area shows that the strong heterogeneity is the main one, but the microscopic heterogeneity is weak. Through the second interpretation of logging and combined with the test results, the permeability and the conclusions of oil and water layers of some wells are corrected, and the new interpretation results are closer to the actual production reflection. The petroleum geological reserves of 9, 10, 1, 2, 45, 6, 8 and 9 oil formations of 72km2 are estimated, and the petroleum geological reserves of 3475.97 脳 10 ~ 4 t are calculated. Among them, Yan'an group was 483.46 脳 10 ~ (4) t, Yanchang group was 2992.51 脳 10 ~ (4) m ~ (3). The reservoir of Yanchang formation is medium-deep, very low porosity, very low permeability, low production, very low abundance and medium reservoir.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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