鄂尔多斯盆地西缘冲断带南段断层相关褶皱及与油气聚集的关系  

Fault-Related Folds and Their Relationship with Oil/Gas Accumulation in Southern Section of Western Margin Thrust Belts of the Ordos Basin

作　　者：章贵松[1] 

机构地区：[1]中国石油长庆油田分公司勘探开发研究院

出　　处：《低渗透油气田》2010年第1期8-12,共5页

摘　　要：大量露头观察和地震剖面分析表明：鄂尔多斯盆地西缘冲断带南段广泛发育断层传播褶皱、断层转折褶皱和断层滑脱褶皱，但具有明显地域性分布和深浅两个构造层次。马家滩地区因分布Tc，区域性滑脱层，具有深、浅两个构造层次，主冲断层上盘以发育断层传播褶皱为特征，下盘则主要发育大型滑脱褶皱，并有少量地断层转折褶皱．是断层相关褶皱最为发育的地区。平凉地区因不存在Tc2区域性滑脱层，冲断席呈单一叠瓦状排列，不具有深、浅两个构造层次，露头常见小型滑脱褶皱和转折褶皱。深、浅两个层次断层相关褶皱圈闭可在各自不同的构造部位聚集油气．但深层次断层相关褶皱圈闭规模较大、构造完整、成藏条件优越，应是西缘冲断带油气勘探主要目标．A large number of outcrop observation and analysis of seismic profiles show that： fault propagation folds, fault zigzag folds and fault detachment fold are widely developed in southern section of western margin thrust belt of Ordos basin, but obvious geographical distribution, a deep structural level and a shallow structural level exist. Majiatan area is provided with a deep structural level and a shallow structural level since Tc2 regional detachment layer is distributed, the hanging wall of the main thrust fault is characterized in that fault propagation fold is developed, large-scale detachment fold is mainly developed in the underwall, a few fault zigzag folds exist, and the underwall is the zone with most developed fault relevant folds. Pingliang Zone does not have the deep structural level and the shallow structural level since it does not have Tc2 regional detachment layer and thrust sheet is arranged in single folded tile shape, and small-scale detachment folds and zigzag folds can be normally seen in outcrops. Relevant folded traps of the deep level fault and the shallow level fault can collect oil gas in respective different structural positions. But relevant folded traps of the deep level fault have larger scale, complete conformation and excellent accumulation condition, and are main objectives of oil and gas exploration in western margin thrust belt.

关 键 词：断层相关褶皱 分布 层次 类型 油气聚集 西缘 冲断带南段 

分 类 号：P54[天文地球—构造地质学]