Densification process of Chang 82 ultra-low permeabilitysandstone，Gufengzhuang-Mahuangshan area，Ordos Basin
Received date: 2017-06-30
Revised date: 2018-01-15
Online published: 2018-03-10
By core physical property,casting slice,scanning electron microscope analysis with energy disperse spectroscopy,the densification process of Chang82 ultra-low permeability sandstone,Gufengzhuang-Mahuangshan area was studied.The study showed that there were four diagenetic events during densification process of the sandstone,which were calcite cement and compaction of early diagenesis stage A，chlorite film cement of early diagenesis stage B，and feldspar dissolution of middle diagenesis stage A on the basis of diagenetic sequence.By quantitative calculation,the initial porosity and permeability of sandstone in the area were 39.7% and 50 500×10-3μm2respectively.In the course of early diagenesis stage A,both calcite cement and mechanical compaction caused the sandstone to very low permeability reservoir whose porosity and permeability were 12.1% and 1.07×10-3μm2 separately.Then chlorite film in early diagenesis stage B converted very low permeability reservoir into ultra-low permeability reservoir whose porosity and permeability were 10.8% and 0.6×10-3μm2 apart.During hydrocarbon accumulation in middle diagenesis stage A,feldspar dissolution formed secondary pore,authigenic quartz and kaolinite cement whose comprehensive effect made porosity and permeability up to 12.% and 1.20×10-3μm2individually.So the densification process of Chang82 ultra-low permeability sandstone,Gufengzhuang-Mahuangshan area is first densification then accumulation and accumulation with increasing porosity and permeability.
Qu Xue-feng,Zhou Xiao-feng,Liu Li-li,Ding Li . Densification process of Chang 82 ultra-low permeabilitysandstone，Gufengzhuang-Mahuangshan area，Ordos Basin[J]. Natural Gas Geoscience, 2018 , 29(3) : 337 -348 . DOI: 10.1176/j.issn.1672-1926.2018.01.011
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