封存箱与油气成藏作用

Compartment and oil-gas pool forming process

自然界的任何一种作用都是在一定的物质结构中发生的 ,油气成藏作用在相当多的情况下是与封存箱结构有非常密切关系的。封存箱这种地质结构在沉积盆地中 ,尤其是盆地的深部相当广泛地存在。它不仅是流体的分隔体 ,而且也分隔着不同的能量区。具有异常压力的封存箱比较容易认同 ,实际上正常压力的封存箱也是其重要的类型。自源式封存箱及靠近其顶板封隔层箱外的勘探目标常常是大、中型油气藏形成和分布的主要结构类型 ,在其箱内和临近其顶板封隔层的箱外是油气的有利富集地带。把封存箱的研究作为油气勘探决策程序的一个环节 ,找到大、中型的油气藏的几率将会大大地提高。塔里木盆地已经发现了各种类型的封存箱和在封存箱不同部位的大中型油气藏 ,它们构成了比较完整的封存箱系列和油气成藏模式。

The oil-gas pool forming process is closely related to the compartment structure in most circumstances. The compartment as a geologic structure extensively exists in sedimentary basin,especially in the deep part of basin. The compartment not only separates liquids but also different energy regions. The abnormal pressure compartment is comparatively to be identified easily, whereas the normal pressure compartment is also an important type. Especially the giant and middle-sized oil-gas fields distribute mostly inside the compartment containing hydrocarbon kitchen or near the top seal outside the compartment. If we regard the study of the compartment as one key step in the exploration decision-making process, the probability of discovery of giant and middle-sized oil-gas field will be greatly increased. All kinds of compartments and oil-gas pools in different positions of compartment have been discovered in Tarim Basin, which have made up a more complete series of compartments and models of oil-gas pool.