Deciphering Tectonic Mechanism and Origin of T85 Horizon in Lishui Depression, East China Sea Basin
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摘要: 为了揭示东海盆地丽水凹陷T85界面上、下裂陷演化的差异，阐明构造变革的成因，研究基于钻井标定的高精度三维地震数据，精细刻画了丽水凹陷的盆地构型、断层活动性和沉降作用时空变化特征.结果表明：丽水凹陷T85界面是一个角度不整合界面，界面之下发育断控的楔形地层构型，而界面之上变为拗陷作用控制的碟形地层构型；断陷期，凹陷沉降作用向西迁移，而进入断拗期，凹陷沉降作用开始逐步向东迁移.结合区域动力学背景，研究建立了T85界面构造变革的成因模型，即构造迁移引起的热沉降模型和下地壳韧性变形的浅层响应模型.这一成果对裂陷盆地裂陷演化和成盆机制研究具有重要借鉴意义.Abstract: To unravel the difference of rift evolution between the sub- and supra-T85 horizon, and illustrate the formation mechanism of the tectonic transition, the rift architecture, fault activity and spatio-temporal variations of subsidence were investigated by using high-quality seismic data and borehole data. Dividing by the T85 angular unconformity, the Lishui depression exhibits two distinct rift architecture: the underlying fault-controlled, wedge-shaped packages and the overlying saucer-shaped packages. Subsidence within the Lishui depression migrated westward during the faulting stage, while it progressively migrated eastward during the subsequent faulting and sagging stage. Together with the regional geodynamic context and advances in rift research, the study proposes that either the thermal subsidence caused by tectonic migration or the shallow response to the ductile deformation of lower crust resulted in the tectonic transition within the Lishui depression. The study significantly improves the understanding of rift evolution and its controlling factors.
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Key words:
- tectonic transition /
- rift evolution /
- unconformity /
- Lishui depression /
- East China Sea basin /
- petroleum geology
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图 1 东海盆地大地构造位置(修改自Wu et al.，2018a及所附参考文献) (a，b)与丽水凹陷构造单元图(c)
Fig. 1. Tectonic location of the East China Sea basin (modified after Wu et al., 2018a, and references therein) (a, b) and structure element map of the Lishui depression (c)
图 3 丽水凹陷Tg(a)与T85(b)界面时间域构造图
Fig. 3. Time-structure map of the Tg (a) and T85 (b) horizons in the Lishui depression
图 4 T85界面测井响应(a)与地震反射特征(b)
Fig. 4. Characteristics of the T85 horizons in well logs (a) and seismic profiles (b)
图 5 丽水凹陷北部凹陷构型地震剖面图
Fig. 5. Seismic section crossing the northern Lishui depression showing the rift architecture
图 6 丽水凹陷中部凹陷构型地震剖面图
Fig. 6. Seismic section crossing the central Lishui depression showing the rift architecture
图 7 丽水凹陷断拗层盆地构型立体图
Fig. 7. 3D architecture of the faulted-sagged sequences in the Lishui depression
图 8 丽水凹陷不同时期控洼断层位移统计直方图
Fig. 8. Major fault displacements for each rift stage in the Lishui depression
图 9 丽水凹陷不同时期地层时间域厚度
Fig. 9. Time thickness maps for each formation in the Lishui depression
图 10 构造迁移引起的热沉降模型
Fig. 10. Schematic diagrams showing the influence of tectonic migration on thermal subsidence within the Lishui depression
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