Segmentation Characteristic and Its Effect on Sag Evolution in Cenozoic of Chengbei Fault, Bohai Bay Basin
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摘要: 形成于中生代、NW走向的埕北断层位于渤海湾盆地中部，为明确其新生代分段发育特征及对埕北凹陷演化的差异控制作用，在整合渤海油田和胜利油田探区三维地震勘探资料、测井资料基础上，对断层几何学、运动学特征和断层控制下的地层展布特征进行综合分析.结果表明：埕北断层新生代呈NW走向展布的"M"形，由2段NWW走向和2段NNW走向的断层分段相间排列、首尾相连而成；经历Ek-Es4（~65~42 Ma）分段复活，Es3-Ed（~42~23 Ma）连通拉张，N-Q（~23~0 Ma）走滑改造3个演化阶段；4个分段在新生代的差异演化控制了埕北凹陷内新生界基底形态、地层超覆、横向背斜发育以及次洼的差异演化，断层分段控制下的凹陷演化可分为3个阶段：Ek-Es4的横向扩张阶段，Es3-Ed的垂向加深阶段以及N-Q的走滑改造阶段.Abstract: The NW-trending Chengbei fault was formed in the Mesozoic and located at the central part of the Bohai bay basin. In order to clarify the fault segmentation characteristics and its control over the framework of the Chengbei sag during the Cenozoic evolution, we integrate 3D seismic exploration data, well logging data from Bohai oil field and Shengli oil field, and analyzes the geometric features, activity rate of the fault and the contact relationship and distribution characteristics of the strata in the sag. The results show that the Cenozoic Chengbei fault is connected by four segments in NWW-and NNW-trending with an 'M' shape on the plan view; the Chengbei fault experienced 3 stages during its evolution in the Cenozoic:reactivation in segment during Ek-Es4 (~65-42 Ma), connection stage during Es3-Ed (~42-23 Ma), and strike-slip transformation stage during N-Q (~23-0 Ma); the evolution of the four segments in the Cenozoic dominated the basement morphology, strata onlap, transverse anticline development, and the evolution of the sub-sag, by the control of the Chengbei fault segments the Chengbei sag evolution can be divided into three stages:the horizontal expansion stage during Ek-Es4, the vertical deepening stage during Es3-Ed and the strike-slip reconstruction stage during N-Q.
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Key words:
- fault segment /
- sag evolution /
- Chengbei fault /
- Cenozoic /
- Bohai bay basin /
- petroleum geology
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图 1 埕北地区构造纲要及地层序列图
Fig. 1. Structure map and stratigraphic sequences of the Chengbei area
图 3 埕北断层各层系界面断层发育平面图
三维资料缺失处以虚线表示
Fig. 3. Map view of the Chengbei fault at different surfaces
图 5 埕北断层各段不同时期断层垂向活动速率
数据点位置见图 1
Fig. 5. The fault activerate of Chengbei fault segments during different periods
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