| Author(s) | Mohammed H. Basyoni |
| Affiliation | Faculty of Earth Sciences, King Abdulaziz University, Jeddah, Saudi Arabia |
| Title | Diagenetic Aspects of the Carbonate Rocks of the Upper Jurassic Jubaila Formation, Central Saudi Arabia |
| Source | Journal of King Saud University. Science. Volume 15, No 1. (2003/1423) |
| Abstract | Abstract. The Jubaila formation shows a variety of diagenetic features of varying significance. These include, dolomitization, dedolomitization and related recrystalization, micritization, compaction and pressure solution and cementation. Dolomite occurs more dominantly in the Malham section and the oil fields in the north east, while lime mudstone and grainstone form major facies to the south in the Wadi Al Birk Section. At the subsurface dolomitization affects the upper part of Jubaila formation in sellective manner. In places the sediments of Jubaila formation are dolomitized resulting in the loss of the original porosity. In other places, like Ghwar oil field, the original porosity is retained so that a thick oil column exists with vertical communication between the Arab (D) reservoir above and the upper part of the Jubaila formation below. Leaching of coarse grainstone and micrites, and dedolomitization of dolomite and dolomitic limestone followed by recrystalization are the most common diagenetic processes affecting the outcrop sections especially. |
