徐集地垒带成藏控制因素分析

Controling Factor Analysis of Accumulation in Xuji Horst Belt

徐集地垒带是中央隆起带南部滚动勘探开发的有利区带,结合油源条件、储盖组合、油层分布规律,分析成藏控制因素,建立该区复式地垒断块群成藏模式,即为深大断裂控制油气运移方向,构造背景控制含油气范围,断块高点聚集,边界断层规模大小与河道砂体决定油气富集程度,表现为多断块、多含油气层系、多油气水系统,油气层沿断层呈"牙刷状"分布,具有上油下气、自西向东油气呈阶梯状分布的典型特征。

Xuji horst zone is the favorable zone for rolling exploration and development in the south of central uplift belt. Combined with oil source condition, reservoir-- cap assemblage and oil reservoir distri- bution, the accumulation controlling factors are analyed and the reservoir patterns of compound fault-- block group are established, namely, the hydrocarbon migration direction is controlled by deep and big fracture, the oil and gas range is controlled by structure background, the high point of fault block is aggre- gated and the oil and gas enrichment degree is decided by the size of boundary fault and the channel sand body, which show as multiple fault--blocks, oil--bearing horizons and oil--water systems. Oil and gas layers distribute along the fault by toothbrush shape, having the tapical characteristics of above oil and be- low gas and oil--gas distribution by toothbrush shape from tb.e west to the east.