NDLI: A tight-gas reservoir in the basinal facies of the Upper Permian Ca1 in the southwestern Zechstein Basin, Poland

Content Provider	Springer Nature Link
Author	Poszytek, Anna Suchan, Jarosław
Copyright Year	2015
Abstract	The Ca1 basinal deposits of the Werra cycle in the southwestern Zechstein Basin, Poland, are similar to those in other parts of the basin, although a high porosity (15 %) dolomite reservoir unit in the middle part near the Rudna Copper Mine (KGHM Polska Miedź S.A.) has a gas accumulation comprised mainly of nitrogen. The reservoir horizon is developed within dolomitic grainstone and occurs in the upper part of the second regressive cycle of the Zechstein Limestone as a result of redeposition of unconsolidated sediment from the carbonate platform margin to the basin floor. Early dissolution of the aragonite components of the grainstone and early dolomitization created moldic and minor intercrystalline porosity. The most important process that formed the porosity was deep burial release of carbon dioxide from the thermal decomposition of organic matter within over- and underlying deposits. The acidic porewater resulted in the dissolution of the rock fabric, which increased the porosity, and on the other hand caused the formation of a Mn-rich dolomite cement that precipitated in the intercrystalline space surrounding the newly formed pores. The created isolated pores were partially filled by euhedral dolomite crystals with Mn-rims. Later dissolution and cementation had a significant influence on the isotopic results. The δ18O values show a clear decrease in the grainstone section from −2 to −5 ‰. The δ13C values (from −3.84 to −5.40 ‰) are typical for the Polish Zechstein Basin; however, there is no significant increase in the δ13C values up-section as is the case for the coeval platform facies. This may indicate that the basinal facies was deposited in more uniform conditions than the platform facies.
Starting Page	1
Ending Page	13
Page Count	13
File Format	PDF
ISSN	01729179
Journal	Facies
Volume Number	62
Issue Number	1
e-ISSN	16124820
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-12-06
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Poland Zechsteinkalk Dolomite Tight-gas Basinal facies Cyclicity Isotopes Sedimentology Biogeosciences Geochemistry Paleontology Ecology
Content Type	Text
Resource Type	Article
Subject	Geology Stratigraphy Paleontology

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