饶阳凹陷潜山油气分布特征及富集规律

DISTRIBUTION FEATURES AND ENRICHMENT REGULARITY OF BURIED HILL RESERVOIRS IN RAOYANG SAG

饶阳凹陷是冀中坳陷潜山油气勘探的重点地区之一。综合应用现代油气成藏、地球物理、地球化学等理论和方法,对饶阳凹陷潜山油气成藏的地质条件进行了分析。结果表明,该区带油源丰富,储集条件好,发育多套有效的储盖组合,各成藏要素时空配置良好,具有形成大规模油气田的有利条件。根据已发现油气藏构造特征、成藏条件及油藏类型得出,研究区油气藏集中分布于潜山顶、潜山坡及潜山内幕。在此基础上,提出了潜山油气藏多分布于近源的断裂带附近,水动力承压区、深凹陷、古隆起的叠置区,断棱、峰顶、内幕高点等位置的油气富集规律。

Raoyang sag, an important region for oil-gas exploration, is located in the middle of Jizhong depression of Bohaiwan basin. The geologic conditions and patterns of hydrocarbon accumulation were researched by using theories and methods of modern reservoir formation, geophysics, geochemistry, and the data of geology, seismic and analysis assay. The results show that this area is likely to be a large- or medium-sized oil-gas field with abundant oil sources, good reservoirs, developed sets of effective reservoir-cap rock assemblages, multiple types of traps, and good allocation of various reservoir-forming factors. Reservoirs were distributed in the tops, slopes and inside areas of buried hills according to characteristics of discovered reservoirs, reservoir-forming conditions and reservoir types. Based on these researches, this paper put forward the enrichment regularity that reservoirs mainly accumulated in the area of near-source, near the fault zone,in the superimposed artesian flow area of hydrodynamic force,in deep depression, on paleo uplift,at a fault edge,at the tops of buried hills, and in high positions of the inside of buried hills.