南堡凹陷源上成藏组合油气勘探潜力

南堡凹陷源上成藏组合包括E3d1及Ng、Nm,是目前冀东油田公司增储上产的主力层组.通过构造解析、油气藏解剖、成藏期次确定、成藏过程模拟,揭示源上成藏组合油气成藏机制,分析勘探潜力.指出油气成藏具有两期充注,印Nm沉积早期和晚期;油源断层是源上成藏组合油气成藏的关键要素,在强大源-储剩余压力差作用下,油气沿断层向上运移,为油气成藏提供充足油源.源上成藏组合油气富集受控于油源断层及其相关的构造圈闭.在压扭应力作用下,共轭剪切带形成有利的区带,勘探潜力巨大,是油气勘探的重点.图7表2参15

Oil-gas exploration potential for above-source plays in Nanpu Sag

The above-source plays in the Nanpu Sag, including E3d1, Ng and Nm, are the main contribution to the present reserves and production increase in the PetroChina Jidong Oilfield Company. The reservoir-forming mechanism for the above-source plays is studied according to the analysis of structure and reservoirs, the determination of reservoir-forming period and the modeling of reservoir-forming processes. There are two stages of oil infilling: early Nm and late Nm. The key factor for the above-source plays is the oil-source fault along which oil and gas migrate upward under the high residual pressure difference between source rock and reservoirs providing sufficient oil source in forming reservoirs. The hydrocarbon accumulation in the above-source plays is controlled by the oil-source fault and the related structural traps. The conjugate shear belt which has huge oil and gas potential under compression and torsion stresses is an important exploration target.