Quantitative Simulation and New Consideration on the Transformation System of the Accommodation Space
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摘要: 为探讨盆地两侧可容纳空间和层序叠加模式的非一致性变化, 利用SEDPAK二维层序模拟软件, 通过考虑控制层序沉积过程的不同参数, 对可容纳空间转换系统进行定量模拟并提出新的认识.模拟结果表明, 盆地两侧同期层序叠加模式可以分为"同步"和"非同步"两种, 同步叠加模式多出现在层序的低位体系域及高位体系域后期, 非同步叠加模式多出现在层序的水进体系域及高位体系域初期.多种地质参数的合理组合, 盆地两侧同期层序均可形成非同步叠加模式.非同步叠加模式对体系域界面的识别、层序对比具有一定的参考价值.Abstract: To discuss the non-synchronous change of accommodation space and sequence stacking patterns in both sides of a basin, using the SEDPAK two-dimensional stratigraphic modelling program, the "transformation system of the accommodation space" within a basin was simulated by considering the various parameters controlling the deposition of a sequence. The simulation results indicate that isochronous sequence stratigraphy within a basin may exhibit both synchronous and non-synchronous stacking patterns at different part of the basin. Synchronous stacking patterns were observed to be primarily developed during the lowstand system tracts and the late highstand system tracts. Non-synchronous stacking patterns were found to be often associated with the transgressive system tracts and the early highstand system tracts. The development of non-synchronous stacking patterns may occur under a number of circumstances within a basin with the right combination of various parameters. Nonsynchronous stacking patterns of isochronous sequence stratigraphy may provide new reference to identify system tracts interface and develop sequence stratigraphie correlation.
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图 1 构造活动以支点做“跷跷板”式运动(可容纳空间转换系统, 据Jiang et al., 2005修改)
A.支点左侧沉降, 右侧抬升; B.支点左侧抬升, 右侧沉降
Fig. 1. Seesaw movement of tectonic subsidence via a fulcrum
图 3 盆地两侧同期层序同步和非同步叠加模式(模拟参数: “跷跷板”式构造沉降运动、海平面正弦变化曲线)
Fig. 3. Synchronous and non-synchro nous stacking patterns of iso chronous sequences in a basin during a sinuous sealevel variation and a seesaw tectonic movement
图 4 盆地两侧同期层序同步和非同步叠加模式(海平面正弦变化曲线的条件下)
Fig. 4. Synchro nous and non-synchronous stacking patterns of isochro nous sequences in a basin during the sinuous change of sea level
图 5 盆地两侧同期层序同步和非同步叠加模式(均一构造沉降、海平面静止的条件下, 盆地两侧沉积物供应量不同)
Fig. 5. Synchronous and non-synchro nous stacking patterns of isochronous sequences in a basin during base level static, symmetrical tectonic subsidence, and variant sediment supplies
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