Authigenic dolomites in the Eocene–Oligocene organic carbon-rich shales from the Polish Outer Carpathians: Evidence of past gas production and possible gas hydrate formation in the Silesian basin
作者： Maciej Jakub Bojanowski
DOI: 10.1016/J.MARPETGEO.2013.12.001
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摘要: Abstract Eocene–Oligocene dolomite concretions and beds from the Grybow Dukla units of Polish Outer Carpathians were studied. These rocks occur in organic carbon-rich, marine fine-grained deposits hemipelagic or turbiditic origin. Mineralogic, elemental stable C O isotopic composition dolomites was determined. Results indicate that formed by precipitation predominantly Fe-rich cement close to sediment-water interface prior significant compaction. The main source bicarbonate for formation bacterial methanogenesis as evidenced high δ13C values up 16.6‰. alkalinity probably weathering silicate minerals which might have also liberated Ca Mg ions form. distribution these indicates microbial methane production widespread Silesian basin. Moreover, some Eastern part unit associated with gas hydrates suggested oxygen dolomitic matrix. Therefore, may serve a proxy areas where biogenic produced, had hydrocarbon potential, could existed. Detailed mineralogic petrographic analyses allowed reconstruction diagenetic sequence evolution pore fluids. Textural relationships between successive generations central parts composite crystals experienced corrosion latest ankerite filled secondary intragranular cavities within those crystals. This observation shows reconstructions fluid based on core-to-rim such lead wrong interpretations. Septarian cracks developed are often multistage cements. earliest ferroan cements precipitated simultaneously matrix septarian cracking occurred very early, during final stages concretionary formation. followed late-diagenetic precipitates, mainly quartz, kaolinite blocky calcite. calcite is commonly bitumen it after oil migration decarboxylation zone.
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