滨里海盆地Z油田油藏类型与成藏因素研究

Z油田主要含油层系包括白垩系-中侏罗统低幅度背斜构造油藏、中三叠统盐檐断鼻油藏和上三叠统岩性圈闭油藏3种油藏类型。通过对紧密围绕盐有关的构造和有效盐窗这两个影响Z油田油气成藏的关键因素的研究认为成藏模式为"盐下生成、盐窗沟通、盐边盐间断层输导、高点聚集、后期保存"。Z油田油源充足,盐窗大而有效,多种有效的输导体系,圈闭类型多而好,埋深适中,储盖层发育且配置良好,侧向遮挡条件具备且后期保存条件良好,可作为今后勘探首选目标区。

OIL RESERVOIR TYPE AND ACCUMULATION FACTORS OF Z OILFIELD IN CASPIAN BASIN

There are three kinds of reservoir type in Z oilfield, including Cretaceous - Middle Jurassic reservoir of low amplitude anticline, Middle Triassic reservoir of fault nose and Upper Triassic reservoir of lithologic traps. By focusing on salt-related structure and effective salt window that two key factors affect the oil and gas accumulation of Z oilfield, studies suggest that hydrocarbon formed under the salt, communicated in the salt window, transported by fault distributed in inter-salt and salt edge, accumulated in high point and saved in late stage. The Z oilfield has a series of advantages, such as adequate the oil source, large and effective salt window, a variety of effective conducting system, various trap types, moderate buried depth, good configuration of reservoir and cap rock, and with lateral barrier and later preservation conditions. Overall, Z oilfield can be used as a preferred exploration target zone in the future.