南堡凹陷岩性-地层油气藏区带划分与评价

Division and evaluation of oil-gas prolific zones for litho-stratigraphic reservoirs in the Nanpu Sag

渤海湾盆地南堡凹陷属断陷型富油气凹陷,以往的油气发现集中分布在构造圈闭中,近年新发现一批岩性-地层油气藏。以富油气断陷盆地"满凹含油论"和含油气系统理论为依据,以油气成藏组合为区带划分单元,利用油源断层构造图、沉积相图、有效主力烃源岩分布图和油气勘探现状图"四图叠合"进行区带综合评价。评价结果显示,南堡凹陷纵向上发育源上、源内、源下三大一级油气成藏组合体,平面上源上东营组一段油气成藏组合发育八大油气富集区带,评价出四大油气有利区带;源内东三段上亚段油气成藏组合发育六大油气富集区带,评价出四大油气有利区带;源下前第三系油气成藏组合划分为两大区和10个油气富集区带,评价出五大油气有利区带。

The Nanpu Sag is a typical lacustrine downfaulted hydrocarbon-rich depression. Some litho-stratigraphic reservoirs have been discovered there in recent years. Based on ＂Sag-wide Oil-bearing Theory＂ and petroleum system, the concept of ＂play＂ is used as a unit for the division and evaluation of oil-gas prolific zones in this paper. The overlaying technique of ＂four maps＂, which are the fault structure map, the sedimentary facies map, the major effective source-rock distribution map and the current exploratory situation map, is applied to the comprehensive evaluation of oil-gas prolific zones. The Nanpu Sag is divided into three first-order plays in vertical, namely above-source play, in-source play and below-source play, and each of them can be subdivided into second-order plays. The above-source play is divided into eight oil-gas prolific zones and four favorable areas are evaluated. The in-source play is divided into six oil-gas prolific zones and four favorable areas are evaluated. The below-source play is divided into two parts with ten oil-gas prolific zones and five favorable areas are evaluated.