(1989) Stratigraphical andmicrofacies analysis of some selected late cretaceous surface and subsurface sections in Arabia. Masters thesis, King Fahd University of Petroleum and Minerals.

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Arabic Abstract

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English Abstract

The cored Late Cretaceous succession in the Umm Gudair#1 crestal well (including the type Gudair Formation) has been studied in thin section. The cored interval which is 223 m(=733' between the drilled depths 3763' and 4496') has been carefully sampled, and the selected samples have been thin sectioned. A total of 110 thin sections have been used for both the litho- and biostratigraphical as well as the microfacies analysis of the succession. One group, three distinctive formations, four different biozones and 10 successive microfacies have been recognized. This is the first revision of the type Gudair limestone since its introduction and the first application of the microfacies analysis for the Late Gudair Formation has been proved to be of late Early to Middle Campanian age, despite its previous assignment to oder ages. The magnitude of the Middle/Late Cretaceous unconformity across the Umm Gudair structure has been assessed by about 8.5 m.y. as it incorporates the Late Turonian, Coniacian, Santonian and most of the Early Campanian. Santonian and most of the Early Campanian. Correlation with nearby wells indicates that this regional break varies markedly in magnitude from one well to another (depending on its position with respect to the structure) and from one structure to the other (depending on the differential growth of such structures from the bottom of the Late Cretaceous sea).

Item Type:	Thesis (Masters)
Department:	College of Petroleum Engineering and Geosciences > Geosciences
Committee Advisor:	El-Naggar, Z. R.
Committee Members:	Sahin, Ali and Lynts, G. W.
Depositing User:	Mr. Admin Admin
Date Deposited:	22 Jun 2008 13:42
Last Modified:	02 Aug 2021 06:07
URI:	http://eprints.kfupm.edu.sa/id/eprint/9508