| dc.description.abstract | Constructing the Tertiary Strata and Structures in Taipei Basin Based on Drilling Data
Hsu, Shao-Chen
ABSTRACT
The geological survey in Taipei Basin has been developed for more than a hundred years from the Japanese colonial period. It is widely accepted that the Taipei Basin is formed as a half-graben tectonic basin by post-orogenic process, and its westernmost geological structure, the Shanchiao Fault, is considered to be a major active fault in the Taipei metropolitan. The subsurface geology of Taipei Basin was insufficient due to the drilling technical limitation and scant amount of boreholes in the past. There were many drillings for major engineering constructions in Taipei in the latest 20 years. These boreholes obtained massive cores that allow us to study the subsurface features of the Taipei Basin. This study attempts to integrate the drilling data, and construct a Tertiary geological map of Taipei Basin.
According to the drilling data in Taipei Basin, the Tertiary basement depth roughly becomes deeper from east to west, which is likely controlled by Shanchiao Fault.
In my study, we use 52 sets of drilling data as control points along with the information of Tertiary strata surrounding around the basin, to construct the basement depth contour in the Taipei Basin. We, further, present the subsurface geological features, and discuss the distribution of the Tertiary strata in the Taipei Basin. Finally, using the Tertiary basement dip data, depth contour and stratigraphic interpretation, the basement geological map of Taipei Basin is constructed.
The understanding of the subsurface geological features in the Taipei Basin, such as the subsurface geological setting basement depth formation distribution and so on, has been significantly improved after this study. The result of the study can provide comprehensive information of the Tertiary basement of Taipei Basin for designs of future major civil constructions and analyses of hazard mitigation. | en_US |