Stratigraphic Development of the Central Persian Gulf During the Neogene
Final rept. 15 Feb 96-31 Jul 97
WOODS HOLE OCEANOGRAPHIC INSTITUTION MA DEPT OF GEOLOGY AND GEOPHYSICS
Pagination or Media Count:
Industry seismic reflection profiles shot in the 60s and early 70s in the central Persian Arabian Gulf are used to map two late Tertiary unconformities, and velocity data from a centrally located well is used to convert travel time to depth to the unconformities. The deeper horizon correlates with a regional unconformity at the end of the Eocene in most wells and dips monotonically to the northeast, whereas the shallower horizon is flatter and correlates with the mid-upper Miocene section in one well. Isopach maps based on wells indicate that sedimentation was relatively uniform across the region until the middle to late Miocene. Sediments deposited since the late Miocene thicken from 100-200 m on the Arabian side of the Gulf to 1000 m near Iran reflecting deposition of sediments eroded from the rapidly uplifting Zagros fold belt. As a result of the rapid deposition, the velocity gradient in the upper 1 km decreases from tilde 4 kmsec per km near Arabia to about 2 kmsec per km on the Iranian side of the Gulf.
- Geology, Geochemistry and Mineralogy