Origin and Spatial Distribution of Carbonate Cements in Yanchang Fm.(Triassic) Sandstones within the Lacustrine Center of Ordos Basin,NW China
Received date: 2011-08-23
Revised date: 2011-10-09
Online published: 2011-12-10
Through the multiple discipline methods of petrology,mineralogy and geochemistry,we try to elucidate the forming mechanism of carbonate cements at different phases,distribution and main controlling factor as well as reservoir effects in the Triassic Yanchang Fm.sandstones,which were deposited in the lacustrine center of Ordos basin,NW China.Three kinds of carbonate cements in these sandstones can be subdivided into early,middle and late phase according to their textural relation and composition.The early and late carbonate cements are dominant in the study area.The former is the product due to precipitation of ultrasaline lake water under normal temperature and pressure.The middle and late cements composed of ferrous calcites are closely related to water-rock interaction in the alkaline diagenetic fluid flow occurred at the A2 period of late diagenetic stage.The carbon element in the early cements are dominantly sourced from the meteoric water or lacustrine carbonate layer,whereas the carbon incorporated into the middle and late cements may be mixed by organic carbon from decarboxylation.The dissolution of feldspathic grains provided the main calcium supply to the precipitation of middle and late cements.The spatial distribution shows that the early cements were dominant in the lacustrine facies mudstone with relatively heavy carbon isotopes,implying their inorganic origin.The middle and late cements with relatively lighter carbon isotopes in turbidite,sandy debris sand and delta frontier as well as delta plain sandstones would be formed within the alkaline diagenetic environment.The tendency of mixing of organic carbon in the carbonate cements at different phases indicates that the quantity of organic carbon would gradually enhance with increasing distance from the ancient lacustrine center.
YAO Jing-Li, WANG Qi, ZHANG Rui, TANG Jun, TIAN Bing, LIAO Peng . Origin and Spatial Distribution of Carbonate Cements in Yanchang Fm.(Triassic) Sandstones within the Lacustrine Center of Ordos Basin,NW China[J]. Natural Gas Geoscience, 2011 , 22(6) : 943 -950 . DOI: 10.11764/j.issn.1672-1926.2011.06.943
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