THE DISTRIBUTION OF LITHOLOGIC TRAPS OF EOGENE IN THE DONGYING SAG OF THE BOHAI BAY BASIN
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摘要: 渤海湾盆地东营凹陷古近系主要存在3种成因类型的岩性圈闭模式,其中与三角洲有关的浊积扇岩性圈闭受三角洲结构控制,与较大规模的湖泛作用有关,多发育在中期基准面上升半旋回;近岸水下扇—浊积扇岩性圈闭受古地貌、断裂性质、断裂活动强度与断裂组合样式等控制,多与沟谷地貌、断阶及断裂的持续活动密切相关;古地貌平台—滩坝岩性圈闭受物源、古地貌及湖岸线控制,主要位于在粗碎屑沉积体前方及侧翼的古地貌平台,发育于长期基准面上升期,其中坝砂主要形成于中期基准面下降期,滩砂主要形成于中期基准面上升期。Abstract: There are mainly three genetic types of lithologic trap mode in the Dongying Sag of the Bohai Bay Basin during Eogene time,which are turbidite(fan) trap related to delta,near-shore subaqueous fan-turbidite fan trap and palaeo-geomorphic platform beach-bar trap.Controlled by genetic types of delta,the turbidite(fan) traps are related to flood lakes.So they are often developed during rising hemicycle of medium-term base-level.Near-shore subaqueous fan-turbidite fan traps are controlled by the palaeo-geomorphology,the characteristics of the faults,the fracture intensity,fracture combination styles,etc.The development of the subaqueous fan is often closely related to trough-valley,fault order,continuous movement of the fault.Controlled by the provenance,palaeo-geomorphology and lake strandline,palaeo-geomorphic platform beach-bar traps lies on the palaeo-geomorphic platform in front of or beside the coarse grained lithosomic body,and develops the rising time of the long-term base-level.In the high-frequency sequence frame,bar sand mainly forms during fall time of the middle-term base-level,while beach sand mainly in rise time of the middle-term base-level.
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Key words:
- turbidite fan /
- beach and bar /
- lithologic trap /
- Eogene /
- Dongying Sag /
- Bohai Bay Basin
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