Research on diagenesis of Upper Triassic Chang 8 reservoir in Jiyuan area of Ordos Basin
Online published: 2010-06-15
The thin section，cathodoluminescence and scanning electron microscopy are applied to analyze the petrological characteristics，diagenesis，authigenic minerals and pore development of Chang 8 reservoir sandstone in Jiyuan area．The result shows that the reservoir rock consists of feldspathic lithic sandstone and lithic arkose with low compositional maturity．The main authigenic minerals include kaolinite，chlorite，illite，calcite，quartz and soda feldspar． The content of kaolinite reflects the development degree of secondary porosity．Chlorite and silica have protective efect on primary porosity of the reservoir,and illite has negative efect on the porosity and permeability．Authigenic calcite which generated in the early stage is favorable for reservoir properties，and a large number of calcite cement pores generated in the later stage have negative efect on the reservoir properties．
Key words： Archie formula; water saturation; cementation factor; pore structure; shale content
LI Xianpeng . Research on diagenesis of Upper Triassic Chang 8 reservoir in Jiyuan area of Ordos Basin[J]. Lithologic Reservoirs, 2010 , 22(2) : 42 -47 . DOI: 10.3969/j.issn.1673-8926.2010.02.008
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