Abstract

The usual focus of seismic exploration for hydrocarbons is to directly image structural, stratigraphic, and diagenetic features in the “soft” sedimentary sequence. However, understanding the geologic processes that gave rise to these shallow features often requires an understanding of the structural deformation of the more “rigid” basement. In the Fort Worth Basin of north Texas, the end product is usually prestack time-migrated sections which indicate that shallow faulting may be basement-controlled. However, there is some doubt as to whether the collapse features in the sedimentary section are controlled by what appear to be rhombochasms in the basement, or whether these rhombochasms are a velocity push-down artifact caused by infill of the collapse features by a slower velocity material. The goal of this study is to improve the image quality of such basement features by the use of more interpreter-driven detailed velocity analysis and depth versus time migration.

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