InterPreting effects of TOCinert organic content on source rock Potential using S2 vs. TOC graPh in Maamba Coalfield,southern Zambia |
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| Authors: | Cryton Phiri WANG Pujun G Roland Nguimbi Abdallah-Yousif Ibrahim Hassan |
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| Institution: | 1． College of Earth Sciences，Jilin University，Changchun 130061，China; 2． Geology Department，University of Zambia，Lusaka 10101，Zambia; 3． College of Construction Engineering，Jilin University，Changchun 130026，China |
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| Abstract: | The authors present the effects of the total organic carbon (TOC inert ) during pyrolysis and how it overall affects the estimates of the hydrocarbon index (HI) using the cross plot S 2 vs． TOC graph． A total of 21 drillcore samples consisting of the non- carbonaceous mudstones，carbonaceous mudstones，coaly mudstones and coals with S 2 ＞ 0． 35 are selected and used． The average TOC for the sampled population is 10． 36 wt%． TOC inert measured from the S 2 vs． TOC graph is 2． 97 wt% and the average pyrolysable TOC live is 7． 39 wt%． The HI is 102 mg HC/g TOC and the pyrolysable HI is 175 mg HC/g TOC，indicating that the TOC inert or mi- neral matrix adsorbs some of the hydrocarbons liberated during pyrolysis resulting into the low HI values which affects the correct determination of the source rock potential． Other applications of the S 2 vs． TOC cross plot have been used to determine the depositional system tracts． The high stand system tract is also determined through this method． |
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| Keywords: | Rock-Eval Pyrolysis S2 vs TOC Maamba Coalfield Basin Zambia |
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