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Volume :32 Issue : 2 2005      Add To Cart                                                                    Download

Organic geochemical approach in carbonate-clastic source-reservoir succession

Auther : F.F. ABDULLAH, B. CARPENTIER, I. KOWALEWSKI AND A.Y. HUC

1Kuwait University, Earth and Environmental Sciences Dept., PO Box: 5969, Safat, 13060, Kuwait. Email:tamam@kuc01.kuniv.edu.kw

2IFP Geology –Geochemistry Dept. 1&4, avenue de Bois-Preau, 92852 Rueil-Malmaison Cedex-France.

3IFP School (ENSPM), 228-232 avenue Napoleon Bonaparte, 92852 Rueil-Malmaison Cedex-France

ABSTRACT

Limestones can be source rocks and reservoirs where within a horizon the rock may contain kerogen and/or oil.  The purpose of this study is to identify the source rock, reservoirs and non-productive zones in a carbonate-clastic succession in the Albian Mauddud Formation in Kuwait using Rock-Eval 6 (RE6) reservoir mode.  A total of 22 core samples were collected from the Raudhatain oilfield in north Kuwait.  These rocks are dominated by carbonates with minor shales and sandstone.  The samples were screened for the amount and nature of the organic matter by the RE6 pyrolyses bulk method, and RE6 reservoir mode.  These samples were solvent extracted and analysed again using the RE6 bulk method to correlate the results with RE6 reservoir mode.  Distinctive samples were chosen for further study of their kerogen characteristics.  The RE6 reservoir mode analyses results indicate two main groups of samples. One group, the reservoir zones, is characterized by a high amount of free hydrocarbons and is usually associated with pure carbonate rocks. The second group, the source rock zones, is characterized by a low amount of free hydrocarbons and relatively high amount of residual carbon, that are generally associated with shale.  The organic matter in the source rock horizons are in the early stages of maturation, and are dominated by type II-III to III kerogen.  Comparison between RE6 reservoir mode with extracted and nonextracted RE6 bulk method shows almost similar results.  The relationship of lithology with the nature of organic matter studied shows good correlation with the results taken from gamma ray, density and porosity logs.  The use of RE6 reservoir mode with RE6 bulk method in complicated areas may help differentiate the reservoir section from source rock sections.  Within reservoir sections, rich and poor hydrocarbon zones may also be distinguished.

 

Keywords:  carbonate reservoir; kerogen Mauddud Formation; organic geochemistry pyrolysis.

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