基于三维地震资料解释、钻井岩心观察、样品分析化验、FMI与试油资料分析等手段,详细剖析了塔河油田不同地区奥陶系走滑断裂带的差异变形特征、形成演化过程及成因机制,探讨了其对中—下奥陶统规模储层发育的控制作用.研究结果表明:①受控于区域构造应力场转换及塔北古隆起演化,塔河油田奥陶系发育三大走滑断裂系统.托普台—主体区X型对称共轭断裂系统:NNE、NNW走向的两组断裂呈X型对称共轭切割,密集成网,主次级断裂伴生,于加里东中期同时形成,印支期—喜马拉雅期NNE走向断裂持续活动.于奇中西部非对称共轭断裂系统:NE、SN走向的两组断裂非对称共轭,呈带状和断续状展布,局部相互切割,先后于加里东晚期—海西早期和海西晚期初始形成,印支期—喜马拉雅期两者均持续活动,NE走向断裂晚期活动更强.东南斜坡区多走向复合断裂系统:NNE、NEE、SN、NNW走向的4组断裂均呈断续展布,NNE与NEE走向断裂限制SN走向断裂延伸,先后于加里东中期—海西期形成,印支期—喜马拉雅期NE与NEE走向断裂持续活动.②三大走滑断裂系统的差异变形与形成演化,控制着塔河油田奥陶系发育3类与走滑断裂相关的控储模式.塔河主体区表层岩溶+断裂同期耦合型:经历加里东中期—海西早期表生岩溶作用,同期X型共轭走滑断裂带叠加耦合活动,形成T74界面之下大面积分布的岩溶缝洞型储集体,沿印支期—喜马拉雅期持续活动的NNE向主干断裂带储层更发育.于奇中西部内幕岩溶+晚期断裂改造型:经历加里东中期—海西晚期多期表生岩溶作用,导致T74界面之下表层岩溶缝洞型储层普遍被夷平化或严重充填,早期岩溶形成的未充填内幕储集体叠加印支期—喜马拉雅期走滑断裂的改造,可保留现今的规模有效储层.东南斜坡区断控缝洞型:处于上奥陶统覆盖区,加里东中期表生岩溶作用弱,走滑断裂多期持续活动的强度控制着规模储集体的发育.

Based on 3D seismic data interpretation, drilling core observation, sample testing, FMI and oil test data analysis, the differential deformation characteristics of Ordovician strike-slip fault zones in different areas of Tahe Oilfield are analyzed in detail, three deformation and evolution models of strike-slip fault zones are established, and their control effect on the development of Middle-Lower Ordovician large-scale reservoirs in different areas is discussed. The results show that: (1) Controlled by the transformation of regional tectonic stress field and the evolution of ancient tectonic pattern in Tabei Uplift, three types of typical strike-slip fault zones are mainly developed in the Ordovician of Tahe Oilfield. In the main area of Yoputai-Tahe, NNE and NNW strike-slip faults that are symmetrically conjugate cut in "X" shape, form closely integrated network, and are associated with primary and secondary faults, they are formed simultaneously in the Middle Caledonian, and the NNE faults were continuously active in the Yanshanian-Himalayan. In the central and western regions of Yuqi, the NE and SN strike-slip faults are asymmetrically conjugate, distributed in strips and intermittently respectively, and locally cut each other, they were initially formed from late Caledonian to early Hercynian and late Hercynian respectively, both of which were continuously active during Indosinian-Himalayan, and the NE faults were more active. In the southeast slope area, the NNE, NEE, SN and NNW strike-slip faults are distributed intermittently and the NNE, NEE faults limit the extension of SN faults, they were initially formed in the middle Caledonian-Hercynian, and the NE, NNE faults continued to be active in the Yanshanian-Himalayan. Affected by the Carboniferous salt layer, the shallow en echelon faults are not developed. (2) Based on the differential deformation, formation and evolution of three strike-slip fault systems, three types of typical reservoir control models of Ordovician strike-slip faults in Tahe Oilfield are established. Contemporaneous coupling type of epikarst+faults in the main area of Tahe Oilfield: supergene karstification coupling with activities of strike-slip faults from middle Caledonian and early Hercynian developed a large area of karst fracture-cave reservoirs under the T74 interface, and the reservoirs is more developed along the NNE strike-slip fault zone that was continuously active in Yanshanian-Himalayan. Inner karst+late fault reconstruction type in central and western regions of Yuqi: multi-staged supergene karstification in middle Caledonian-late Hercynian flattened the epikarst fracture-cave reservoir under the T74 interface, and most of the remaining cave reservoirs in the middle and lower parts of Yingshan Formation have been seriously filled. The large-scale effective reservoirs are preserved now due to the unfilled early inner karst reservoir superimposing the transformation of strike-slip faults in Indosinian-Himalayan. Fault controlled fracture-cave type in the southeast slope area: it is located in the Upper Ordovician coverage area. The supergene karstification is weak in the middle Caledonian, and the intensity of multi-stage continuous activity of strike-slip faults controls the development of large-scale reservoirs.