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Volume :16 Issue : 2 1989      Add To Cart                                                                    Download

Sedimentological evolution, diagenesis and hydrocarbon

Auther : MOHAMED I. H. EL-ANBAAWY AND KHALID A. AL-THOUR

Department of Geology, Faculty of Science, Cairo University, Giza, Egypt and Department of Geology, Faculty of Science, Sana University, Sana Y. A. R.

 

ABSTRACT

 

On the basis of the lateral and vertical distribution of the lithofacies identified within the Late Jurassic Amran sequence (Thoma Member) in Jabal Al-Balaq area, Marib, Y.A.R., three megafacies were recognized. Proceeding from the shore landwards they are: (1) Ooid bank, including barriers such as reefs and carbonate sand shoals adjacent to the margin of a shallow platform having intertidal to subtidal agitated water, the bank being composed of skeletal packstone, oolitic grainstone and oncolitic packstone; (2) Shelf lagoon, behind the shoal, characterized by less turbulent pelletoidal wackestone, sandy mudstone and algal stromatolite (boundstone); (3) Alluvial coastal plain, including tidal sand flat of the marinen shoreline-intertidal area, where cross-bedded sandstone and alluvial fan toe conglomerate were deposited. The apparent small-scale facies variations which are the result of the allocyclic tectonically controlled sea level fluctuations, reflect a complex interfingering of the depositional environments and the resulting rock types.

 

The paragenetic sequence of the post-depositional processes within the siliciclastics

inferred is: iron oxide cementation, authigenic growth of mica clays, generation of pressure solution and compaction, and generation of quartz overgrowths. It is indicated that the compaction The best oil process followed the neomorphism and cementation within the carbonates. reservoir is the coarse grained sandstone and the oncolitic packstone, followed by the algal stromatolite. The organic-rich shelf lagoon carbonates are considered to have a good hydrocarbon source potential.

 

 

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