An oil field consists of a reservoir in a shape that will trap hydrocarbons and that is covered by an impermeable or sealing rock.
一个油田由形态上会圈闭油气、并被不渗透的或封闭岩石所覆盖的储集层组成。More specially, physical concepts are required to understand folds, faults, and diapirs, and hence their roles in petroleum entrapment.
更为特别的是，在理解褶皱、断层和底辟以及它们在石油圈闭过程中的作用时需要物理概念。The south of Junggar basin has complicated structure , many entrapments and active surface, all this indicates a large resource quantity.
准噶尔盆地南缘构造复杂，圈闭众多，油气苗显示活跃，资源量大。The identification and characterization of lithologic pinch-out boundary is always a problem in the description of subtle traps.
岩性尖灭线的识别与刻画，一直是隐蔽圈闭描述的难题。So far, non-structural traps have become important and difficult exploration targets in world oil and gas industry.
非构造圈闭已成为目前世界油气勘探的重点和热点，不同的地质环境形成的非构造圈闭各异。Levorsen gave a concise definition of a trap as "the place where oil and gas are barred from further movement. "
利温森（Levorson）将圈闭简明地定义为：“阻止石油和天然气进一步运移的地方。”Note that in areas of monoclinal dip the closure of a trap may not be the same as its structural relief.
值得注意的是，在只有单斜地层的构造内，圈闭的幅度可能与构造的起伏不一样。Each systems tract has its own unique petroleum system attributes , including reservoir , seal , trap, and source potential .
每种体系区块都有其独特的石油体系特征，包括油藏、该曾、圈闭和生油潜力。of the bed is then drawn through the intersecting contour points bearing in mind the closure directions anticipated from the rule of Vs.
考虑到V字形法则预计的圈闭方向，通过等高线交点勾出岩层的露头线。