بناء و تفسير مقطعين زلزالين إقليميين لترسبات عصر الجوراسي في جنوب العراق

الملخص EN

This study included the construction of two regional seismic sections in southern Iraq; the first is 196 km in length and and started from SA-1 well in southern west of Iraq, and ended at SA-3 well, passing through SA-2 well at Basrah region.

The second regional seismic section, about 167 km in length, started at SA-3 well near the southern boundaries of Iraq, south of Basrah city, and passed by SA-3, SA-4 and SA-5 wells, then ended at SA-6 well at the Amara region.

Twelve seismic reflection lines were used, in addion to some minor seismic lines to link the major lines.

Many conventional processing tools were applied to construct the two regional sections.

One of the results of the present study is the explanation of the general structural features along the regional sections.

The results also show the detailed structural changes on the Jurassic sediments considered in the present study, which included Gotnia, Najmah, Sargelu, and Alan formations.

Gotnia Formation showed a decrease in thickness between 2390-2470 CDP, which is thought to have resulted from salt and anhydrite beds motion.

Generally, it is believed that the thickness of Jurassic sediments for the studied formations is reduced in southern Rumaila and Halfaya due to vertical tectonic movements which affected the structures of the southern southeastern region of Iraq .

The boundary between the main tectonic units of Iraq (the stable and unstable shelf) has been defined on the first regional seismic section at 1500-2000 CDP.