Deposition, diagenesis, and weathering of organic by Ralf Littke

By Ralf Littke

The publication on deposition, diagenesis, and weathering of natural matter-rich sediments is a precis of 7 years of study paintings of the writer on the Institute of Petroleum and natural Geochemistry in J}lich. It includes a comparision of assorted depositional environments (lakes, deltas, seas)with admire to natural subject features, a unique bankruptcy at the deposition of the Posidonia shale, a precis of natural topic maturation and similar petroleum new release, and a bankruptcy at the use of maturationparameters as calibration instruments for numerical modelling of temperature histories of sedimentary basins. additionally, microscopic results of petroleum new release and oil to gasoline cracking are handled. the ultimate chapters deal withcoals as resource rocks for oil and fuel and with the consequences of weatheringon sediments that are wealthy in natural subject.

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1990). No salinity changes influenced the Messel Shale, which contains a remarkably homogeneous kerogen on a petrologic and bulk geochemical level. Its rather uniform, intermediate HI-values (Table 9) formally indicating type-II kerogen are the effect of a mixture of aqueous (type-I) and terrigenous (type-Ill) organic matter. Also, ionic composition of the water in the two lakes was very different: Lake Messel was rich in iron, whereas the Ries lake, completely surrOunded by Malmian carbonates, was dominated by alkaline and alkaline earth ions (Na, K, Ca, Mg) and poor in iron (Jankowski, 1981).

In Hydrogen Index values (Table 9). , 1990). No salinity changes influenced the Messel Shale, which contains a remarkably homogeneous kerogen on a petrologic and bulk geochemical level. Its rather uniform, intermediate HI-values (Table 9) formally indicating type-II kerogen are the effect of a mixture of aqueous (type-I) and terrigenous (type-Ill) organic matter. Also, ionic composition of the water in the two lakes was very different: Lake Messel was rich in iron, whereas the Ries lake, completely surrOunded by Malmian carbonates, was dominated by alkaline and alkaline earth ions (Na, K, Ca, Mg) and poor in iron (Jankowski, 1981).

Huc et al. , the Cretaceous Douata basin (1-3% Corg), the Miocene Mahakam delta (1-4% Corg) and the Westphalian in the Paris basin (t-5% Corg). Few clastic rocks in coal-bearing basins contain more than 10% Corg. Exceptions seem to be black shales (see Fig. 20) derived from marine ingressions (Wenger and Baker, 1986: up to 20% Corg) and mudstone partings within coals seams (Littke and ten Haven; 1989: up to 32% Corg). 5), whereas the richness of the latter is partly due to the in-situ growth and preservation of roots after clastic deposition (Scheidt, 1988).

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