夹层及物性遮挡带的成因及其对油藏的控制作用——以准噶尔盆地莫西庄地区三工河组为例

针对准噶尔盆地莫西庄地区厚层砂体内油水分布关系复杂、油藏圈闭类型难以识别等问题，从非均质性研究入手，揭示了夹层和物性遮挡带的成因及其对油气分布的控制作用。夹层不但在油藏顶部对油气起封堵作用，而且在油藏高度不大的情况下也能够起到侧向封堵的作用，造成了上水下油的油水纵向分布状况和倾斜的油水界面；以成岩作用为主形成的横向物性遮挡带是油气侧向封堵的基础，这种物性遮挡带的存在提供了侧向遮挡条件，造成了物性遮挡带两侧油水关系的不同，控制了油气水的分布。图4参9

Origins of interlayer and permeability barrier and their controlling function on reservoir-With Sangonghe Formation of Moxizhuang in Junggar Basin as an example

Aimed at the complicated distribution of oil and water in the thick sandbody and the difficulty of identifying the trap type in Moxizhuang, Junggar Basin, the heterogeneity of the reservoir was studied and the origins of interlayer and permeability barrier and their function on the oil and gas distribution were discovered. The interlayer blocks off the oil and gas not only at the reservoir top, but also, if the oil column height is short, on the side. These cause the situation of waterup and oil-down in vertical and the tilted oil/water contact. The diagenesis-formed lateral permeability barrier zone provides the necessary condition for the side block, leading to the different oil/water contacts on both sides of the zone and controlling the distributions of oil, gas and water.