Sedimentological and diagenetic controls of gas in Lower and Early Upper Carboniferous sediments, NE Germany

摘要: Abstract Fine-grained, organic-rich Paleozoic sediments are proven source rocks for conventional gas systems in NW Europe and large, unconventional reservoirs assumed Lower to Early Upper Carboniferous black shales. However, despite numerous boreholes exploring hydrocarbons, the shale potential remains uncertain. This paper comprises detailed information on sedimentary structure lithofacies associations along with spatial distribution, thickness, thermal maturity, organic inorganic petrology as well geochemistry mineralogy of shales NE Germany unravel evolution gas-relevant properties. Sediments “Kohlenkalk” Formation (Carboniferous Limestone) Rugen Island area were deposited an extensive deep-water carbonate shelf. Transgressive–regressive cycles led formation up 2000 m thick intercalation mud- limestones. High total carbon contents (2.4–7.0 wt.%) a mainly Type II + III kerogen have been under dysoxic anoxic conditions attained favorable present-day maturities (0.8–1.8% VRr) indicating oil upper part succession deeper parts. “Altmark–North-Brandenburg Culm” (Synorogenic Flysch Formation) turbidity current-derived sand/silt–mud interbedded mudrock deep marine siliciclastic slope basinal setting. The ~ 1900 m has TOC 0.5–2 wt.% 2.3–3.2% VRr possible hybrid accumulation areas where is buried