Block Rotation Effect and Its Significance of Tanlu Fault
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摘要: 为探究郯庐断裂莱州湾段右行走滑活动的构造响应并约束其起始时期，以最新钻井资料和三维地震资料为基础，深入剖析研究区与右行走滑活动密切相关的构造-沉积响应.结果显示，双轨走滑右行活动开始后，其夹持块因发生顺时针方向的被动旋转而产生差异应变（伸展或挤压）效应.在叠加区域伸展作用的背景下，伸展效应促进沉降作用，致使先存凸起区加速沉降并演变为洼陷区，先存洼陷区沉降幅度更大，现今均为富烃洼陷；挤压效应则抑制沉降作用，致使先存凸起区持续保持凸起状态，而先存洼陷区多沉降减缓甚至转为抬升，生烃潜力减小.综合地层残存信息及区域构造环境表明郯庐断裂带莱州湾段的右行走滑旋转效应最早始于沙三中段沉积时期.Abstract: In order to explore the starting time of dextral strike slip of the Laizhou Bay segment of the Tanlu fault and its tectonic response, structural sedimentary responses closely related to right strike slip movement are studied in depth based on the latest drilling data and 3D seismic data. It is found that the clamped geological block rotated clockwise passively as soon as the double track strike slip began its dextral strike slip, resulting in differential strain (extension or extrusion) effect. During a regional extensional background, subsiding would be promoted if the extension effect is produced, enlarging the subsidence area of the partial depression and changing the part of the uplift into the depression area, both proved to be hydrocarbon rich depressions. If the extrusion effect is produced, subsiding would be inhibited, resulting in the slowdown, even shrinking, uplifting and eroding of the settlement of some depression areas, and the potential of hydrocarbon generation decreases or even disappears, and convex areas still maintain a state of protruding. The comprehensive information of stratigraphic residuals and regional tectonic environment indicate that tectonic responses to the dextral strike slip of the Tanlu fault (Laizhou Bay segment) simultaneously appeared when the E2s3M was deposited.
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Key words:
- Tanlu fault /
- double track strike slip /
- block rotation effect /
- differential strain /
- tectonics
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图 4 研究区沙一二段（a）与东营组（b）地层厚度等值线图
Fig. 4. Stratigraphic thickness contour maps of E2s1-2 (a) and E3d(b) in the study area
图 5 右行双轨走滑改造模式
Fig. 5. Reconstruction pattern map of the right lateral double-track strike-slip
图 6 走滑增压与释压段示意及莱北一号断层左行走滑的地震剖面证据
Fig. 6. Schematic diagram of strike slip pressurization and release section and evidence map of seismic profile for left lateral strick- slip of the Laibei No. 1 fault
图 7 莱北低凸起及围区古近系顶面断裂分布
Fig. 7. Fault distribution of Paleogene top surface on Laibei low uplift and its peri area
图 8 “北块”西南区左行剪切破裂地震剖面
T2、T8分别为新近系、新生界底面反射层；剖面位置见图 7
Fig. 8. Seismic section of left lateral shear fracture in southwestern corner of the "North Block"
图 9 研究区渐新世底面（a）与始新世底面（b）三维可视化示意图
Fig. 9. The sketch map of 3D visualization of the bottom of the Oligocene (a) and Eocene (b) in the study area
图 10 斜向与正向挤压产生的走滑分量示意图
Fig. 10. Diagram of strike-slip component produced by oblique and forward extrusion
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