Abstract
In this paper, a velocity model of the Southern Depression of the Tainan Basin is obtained along with its migrated image from an iterative pre-stack depth migration approach. The Cenozoic strata are uniformly layered with velocities varying from similar to 1.8 to similar to 3.6 km s(-1) However, the general velocity is slightly lower in the NW segment than the SE. Both fractures and burial depth might be the controls of their seismic velocities. There is an unconformable contact between the Cenozoic and underlying Mesozoic strata with an abrupt velocity jump from similar to 3.2 to similar to 4.3 km s(-1). The Mesozoic strata are recognized with acoustically distinct reflection patterns (chaotic, deformed and discontinuous) and complex internal structures (uplift, folds and faults). Their interval velocities range from similar to 4.3 to similar to 4.7 km s(-1) within a depth from similar to 3.5 down to similar to 12.5 km, and the maximum depositional thickness reaches up to 6.5 km. Multiple tectonic events such as collision, subsidence and uplift might be responsible for the complexity of the Mesozoic strata.
Highlights
The Tainan Basin, located offshore southwestern Taiwan, is one of the typical Cenozoic polyhistory basins along the northeastern margin of South China Sea (Fig. 1)
The Mesozoic strata are recognized with acoustically distinct reflection patterns and complex internal structures
Their interval velocities range from ~4.3 to ~4.7 km s-1 within a depth from ~3.5 down to ~12.5 km, and the maximum depositional thickness reaches up to 6.5 km. Multiple tectonic events such as collision, subsidence and uplift might be responsible for the complexity of the Mesozoic strata
Summary
The Tainan Basin (or Taixi’nan Basin, TNB in brief), located offshore southwestern Taiwan, is one of the typical Cenozoic polyhistory basins along the northeastern margin of South China Sea (Fig. 1). As an important physical parameter, the seismic velocity can provide more derived information to the conventional seismic images are widely used to constrain the morphological features of the substructures, the imaging-dependent stacking velocities are rarely used (Yu and Lin 1991). These are because the time-domain stacking velocity is short of direct geological meanings, and the conventional Dix interval velocity (Dix 1955) has fatal shortcomings, such as severe instability and lateral distortions (Tillard and Dubois 1995).
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