Tectonic Styles and Kinematic Characteristics of Negative Inversion Structure in Dongying Depression
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摘要: 中、新生代强烈的负反转作用是东营凹陷构造演化的一个重要特色.为了解负反转构造对东营凹陷中、新生代盆地形成过程中的意义, 以高分辨率三维地震资料解释为基础, 详细刻画了东营凹陷负反转构造几何学样式, 并综合运用计算断层活动速率和负反转率以及编制地层位移-距离曲线等方法, 对东营凹陷负反转断层运动学特征进行了系统的定量研究.结果表明, 东营凹陷J3-K1和Ek-Es4两期盆地的主体均是印支期逆冲断层发生负反转作用所致, 总的负反转率约为3.367~8.3, 其中J3-K1时期负反转率为1.388~3.904;负反转构造最终定型于Es3-Es2时期; 负反转作用在空间上呈现出SW至NE逐渐增强的演变规律.东营凹陷负反转构造的研究对于盆地内部深层油气藏的勘探具有重要的理论意义和实际应用价值.Abstract: The strong negative inversion structure in Mesozoic-Cenozoic is a prominent characteristic during the tectonic evolution of Dongying depression.In order to understand the significance of the negative inversion structure in the process of Mesozoic-Cenozoic basin formation in Dongying depression, this paper describes in detail the geometry styles of negative inversion structures in Dongying depression on the basis of the interpretation of the new high resolution 3D seismic profiles.And by utilizing the methods of calculating the fault activity velocity, negative inversion ratio, and displacement-distance curve, the authors quantitatively analyse the kinematic characteristics of the negative inversion structures in Dongying depression.The result indicates that in the Dongying depression, the extension basins developed in J3-K1 and Ek-Es4 stages were mainly controlled by the negative inversion of the thrust faults formed in Indo-Chinese epoch.The total negative inversion ratio is 3.367-8.3, and the ratio in J3-K1 stage is 1.388-3.904.The negative inversion structures accomplished ultimately in the Es3-Es2 stage.The distribution of the negative inversion ratios indicates an increase in deformational degree from SW to NE in the whole region.The research of negative inversion structures in Dongying depression has important theoretic and practical significance in the exploration of the deep hydrocarbon reservoirs.
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图 1 (a) 东营凹陷构造单元; (b) ~ (g) 过各负反转断层地震剖面及解释成果(位置见图 1a)
Fig. 1. (a) Geological sketch of Dongying depression; (b) - (g) are the seismic profiles through negative inversion faults and their geological interpretation. See location See location in Fig. 1a
图 3 (a) 正反转断层位移-距离曲线示意图(Williams et al., 1989)和(b)负反转断层位移-距离曲线示意图
Fig. 3. Sketch of displacement-distance curve of inversion fault suggested by Williams et al. (1989) and (b) sketch of displacement distance curve of negative inversion fault
图 4 冲断系负反转率计算示意图
Fig. 4. Sketch map of calculating negative inversion ratio in inversion thrust belt
图 5 东营凹陷负反转断层各时期活动速率图
Fig. 5. Activity velocity of negative inversion faults with time in Dongying depression
图 6 东营凹陷负反转断层定量分析综合图
a.定量分析点位置(①~⑧); b.断层负反转率分布图; ①~⑧.断层活动速率分布图和地层位移-距离曲线图
Fig. 6. Analytical results of negative inversion faults in Dongying depression
表 1 东营凹陷负反转断层负反转率统计表
Table 1. Calculation result of the negative inversion ratio in Dongying depression
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