Tiba – Natrun - Kattaniya Basin, Northern Western Desert (Egypt): Impact of fault orientations on basin inversion

Moustafa, A.R. ; Gaber, W. ; Abd El-Aziz, M 


Abstract


The Tiba - Natrun - Kattaniya basin complex was formed by Jurassic and Cretaceous rifting in the northern Western Desert of Egypt. The basin complex includes two sub-basins oriented NE-SW (Kattaniya) and WNW-ESE (Tiba-Natrun) which have half-graben geometry and were formed by two episodes of rifting. Rifting started in the Jurassic in the Kattaniya basin and in the Early Cretaceous in the Tiba-Natrun basin. Basin inversion affected the area in Late Cretaceous-Early Tertiary in response to WNW-ESE shortening. NE-SW oriented faults bounding the Kattaniya basin were reactivated by reverse slip whereas WNW-ESE oriented faults of the Tiba-Natrun basin continued normal slip and basin subsidence. For this reason, basins lying parallel to the direction of shortening do not get inverted compared to basins lying normal to or at an angle to the shortening direction. Inversion-related uplift affected Jurassic and Cretaceous source rocks in the depocenter of the Kattaniya basin leading to incomplete hydrocarbon maturation in this portion of the area. In contrast, continuous subsidence of the Tiba-Natrun basin allowed hydrocarbon maturation and expulsion from potential source rocks. Deposition of thick syn-inversion sediments in the fore-deep area of the Kattaniya basin (Gindi basin area) helped maturate Upper Cretaceous source rocks south of the Kattaniya depocenter. Intra-basin fold traps associated with the inversion of the Kattaniya basin as well as tilted fault blocks formed by Cretaceous rifting in the Tiba-Natrun basin form excellent hydrocarbon traps. Extensive exploration in the area indicates that hydrocarbon traps in the highly inverted part of the Kattaniya sub-basin are not suitable for hydrocarbon accumulation possibly due to halting hydrocarbon maturation (as a result of inversion) and lack of trap integrity (breaching by erosion, absence of top seal, high fracturing, etc.). Structural closures lying away from the highly inverted area are the best hydrocarbon prospects in the inverted province.


Other data

Issue Date 2008
Publisher Earth Science Society of Libya (Tripoli, Libya)
Source Moustafa, A.R., Abd El-Aziz, M., and Gaber, W., 2008, Tiba – Natrun - Kattaniya Basin, Northern Western Desert (Egypt): Impact of fault orientations on basin inversion In: Salem, M.J. and El-Hawat, A.S. (eds.): 3rd Symposium on the Sedimentary Basins of Libya (The Geology of East Libya), v. 1, p. 295-310.
Conference 3rd Symposium on the Sedimentary Basins of Libya (The Geology of East Libya) 
URI http://research.asu.edu.eg/handle/123456789/155757


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