GEOCHEMICAL CARACTERIZATION OF MOROCCAN TARFAYA OIL SHALE

Transcription

1 GEOCHEMICAL CARACTERIZATION OF MOROCCAN TARFAYA OIL SHALE A. chakor alami 1

2 MOROCCAN OIL SHALE DEPOSITS 2

3 GEOGRAPHICAL SITUATION Report N

4 GEOLOGICAL ASPECTS OF TARFAYA OIL SHALE DEPOSIT Report N

5 MEAN OIL YIELD OF TARFAYA DEPOSITE 5

6 Data Type Moisture General Properties of Tarfaya Oil Shale Value 17.5 (%wt) Density PCS 1100 (kcal/kg) Oil yield CO 3 Kerogen Ash Organic Carbon Mineral Carbon Organic Sulfur Mineral Sulfur 74 (l/t) 40.2(%wt) 15.9 (%wt) 54.9 (%wt) 11.3 (%wt) 8.0 (%wt) 1.7 (%wt) 0.3 (%wt) 6

7 Stratigraphic Column Report N

8 Schematic diagram of a Rock-Eval S1(mgH/gRock) Free Hydrocarbon S2(mgHC/gRock) HC generated from Kerogen S3(mgCO2/g rock) HI = S2/TOC OI=S3/TOC Tmax( C)= pyrolysis Max of S2 8

9 The deep Well localization 9

10 Type of Organic Matter Outcrops Oil shale Cenomanien Inferieur TYPE I 800 0,5% Ro Cénomanien Supérieur TYPE II % R o Turonien Inférieur 200 1,5 % R o TYPE III Turonien Moyen Tmax( C) Turonien Supérieur 10

11 Type of Organic Matter Oil shale well samples TYPE I 800 0, 5% Ro IRE TYPE II % Ro 200 1, 5 % Ro TYPE III Tarfaya Wells Tmax( C) 11

12 Correlation of Oil yield Vs S2 Fisher AssayVsS Oil yield = 0,9086*S2 + 3,2861 R 2 = 0, Fisher Assay Linéaire (Fisher Assay) S2(mgHC/gR) 12

13 Correlation of Oil yield Vs Total Hydrocarbons Fisher AssayVs (S1+S2) y = 0,9246x R 2 = 0, Fisher Assay Linéaire (Fisher Assay) S1+S2 ( mghc/ gr) 13

14 Geochemical Log of IRE well 0 PLioquaternaire Eocne sup. 500 Eocène moy. Depth Subsurface (m) Eocène inf. Paléocène Maastrichtien Campanien Santonien Coniacien Turonien Cénomanien 2000 Albien TOC S1 (mg/g) S2 (mg/g) HI TMAX (C) 14

15 GC-MS of Oil sampels Sample 1535-OIL Ion mass DIA27S DIA27R DIA28SA DIA28SB DIA28RB DIA28RA DIA29R C28S C28R C29S C27S C29R C27R C28BBR C28BBS BB_D29S C27BBS C29BBR C29BBS File: M D\DATA.MS Date & Time: 3 Jun 05 4:04 pm Sample AG451 Ion mass Oil sample DIA27S DIA27R DIA28SA DIA28SB DIA28RB DIA28RA DIA29R C28S C28R C29S C27S C29R C27R C28BBR C28BBS BB_D29S C27BBS C29BBR C29BBS File: M D\DATA.MS Date & Time: 3 Jun 05 9:39 am

16 GC-MS of Oil and Rock sampels Sample 1535-OIL Ion mass TR24 TR25A DESEHOP TR26A TR28A TR28B TR29A TR29B TS TM TR30A TR30B H28 C29TS M29 M30 GAM TR23 H32R H33S H29 H31R H32S H31S H30 File: M D\DATA.MS Date & Time: 3 Jun 05 4:04 pm Sample 1645-ROCK Ion mass TR24 TR25A TR23 DESEHOP TR26A TR28A TR28B TR29A TR29B TS TR30A TR30B H28 C29TS M29 M30 GAM TM H32R H33S H29 H31R H32S H31S H30 File: M D\DATA.MS Date & Time: 3 Jun 05 11:47 am 16

17 Diagramme Ternaire des Stéranes C27,C28 et C29 17

18 Burial History of IRE well 0 K Pal N HQ Fm PLioquaternaire Eocne sup. 500 Eocène moy. Depth Subsurface (m) Eocène inf. Paléocène Maastrichtien Campanien Santonien Coniacien Turonien Cénomanien Albien 2000 Early Mature (oil) 0.5 to 0.7 (%Ro) Mid Mature (oil) 0.7 to 1 (%Ro) Age (my) t = 0 Late Mature (oil) 1 to 1.3 (%Ro) Main Gas Generation 1.3 to 2.6 (%Ro) 18

19 Model calibrated by Tmax Vs Depth 0 Fm PLioquaternaire Eocne sup. Depth Subsurface (m) t = 0 Maturity VR LLNL (%Ro) Eocène moy. Eocène inf. Paléocène Maastrichtien Campanien Santonien Coniacien Turonien Cénomanien Albien Maturity VR LLNL Early Mature (oil) 0.5 to 0.7 (%Ro) Mid Mature (oil) 0.7 to 1 (%Ro) Late Mature (oil) 1 to 1.3 (%Ro) Main Gas Generation 1.3 to 2.6 (%Ro) %Ro TMAX 19

20 Conclusion The oil shale is Upper Cretaceous in age Fisher assay yield, could reaches more than 130l/t. Rock-Eval IV analysis results show samples with values great than 600mg HC/g rock, indicating a marine depositional environment. The maturation modelling indicates that oil shale sediments could be mature at the south of Tarfaya basin. Geochemical results and maturity parameters of outcrops bore holes and wells samples showed that the exploitation of Tarfaya oil shale could be either by in situ process or by a conventional surface retorting process. The high PCS values of Tarfaya oil shale (more than 1000 kcal/kg) make the use of the oil shale combustion for electrical energy generation possible. 20