兴隆台浅层气成藏机理及主控因素研究

Study on Accumulation Mechanisms and Main Controlling Factors of Shallow Gas Reservoir in Xinglongtai

寻找新的含气层系尤其是浅层气是缓解辽河油田天然气产量递减的有效途径。兴隆台油气田浅层气埋深1000~1600m,构造上处于西部凹陷兴隆台断裂背斜构造带,气源以沙三段烃源岩为主,东营组浅层气所在部位Ro在0.8%~1.3%之间,处于大量生油阶段,南部凹陷中心部位烃源岩主要处于高过成熟的生轻质油和湿气阶段,部分到干气阶段。该油田不同方向都有成熟-高过成熟烃源岩的分布,气源条件优越。该油气田东西向断层发育,在断裂活动期,断层主要起运移通道的作用;在静止期,对天然气也起一定的运移通道作用,仅具相对封堵性,对石油则以封堵作用为主。兴隆台浅层气成藏受多种因素控制,古隆起是该油气田形成的宏观地质背景,对于东营组气层来说,主要是在宏观控制因素下的微观控制因素：位于构造高部位,砂层与不同规模的断层沟通,单砂层厚度不能太大。

To look for new gas-bearing layers especially shallow gas is an effective way to alleviate the nat- ural gas production decline.The shallow gas in Xinglongtai oil-gas field is located in anticline structural belt of Xinglongtai fracture in western sag with burial depth of 1000 to 1600m.The gas is from Es3 source rocks mainly.Ro of the location of the shallow gas in Dongying Formation is 0.8%-1.3% in the period of a large number of oils generated.The source rocks in the center of southern sag were in the period of high postma- ture light oil and wet gas generation mainly and some is in the dry gas period.Mature-high postmature source rocks distribute everywhere in this oilfield with good gas source conditions.East-west faults are devel- oped in this oil-gas field,which play the main role of migration pathway in fault activity period,and plays certain role of migration pathway for the natural gas in non-lactating period and plays plugging role on oil. Xinglongtai shallow gas reservoir accumulation is controlled by many factors.Paleo-uplift is the macro-geologi- cal setting of this oil-gas field.The formation of Dongying Formation gas reservoir is controlled by micro factors including high position of structure,communication of sand bed and faults with various scale and not much thicker of single sand bed.