Evolution of Diagenetic Environments for Oligocene Huagang Formation Sandstone in Xihu Sag
Received date: 2012-03-18
Revised date: 2012-06-24
Online published: 2012-08-10
By means of microscopic observation of a lot of petrographic thin section as well as diagenetic stage of classification signs,we consider that the diagenetic stages of Huagang Formation sandstone in the study area would be at the late diagenetic stage B.We use optical microscopy,scanning electron microscopy,electron microprobe and X-ray to analysis species and composition of authigenic mineral,rock structure,types and structural characteristics of porosity for the Huagang Formation reservoir sandstone in the Xihu sag,East China Sea Shelf basin,and identify acidic and alkaline diagenetic environments.The acidic diagenetic environment is characterized as dissolution of feldspar+secondary stripping holes+kaolinite+quartz characterized by increased secondary and the alkaline diagenetic environments is the dissolution of quartz+advanced filling and metasomatic ferrous carbonate.The main evolution mechanism of acid and alkaline diagenetic environments is controlled by the unary and binary water-soluble acid and phenol which are generated by thermal cracking of oxygen-containing carboxyl and phenol of nuclear periphery kerogen.At middle diagenetic stage A period and RO ranging from 0.5% to 1.3%,the unary and binary organic acid is generated by removing carboxyl from organic matter,associated with CO2 formation which will make pore fluid become acidic.When the thermal maturity of source rock increases,organic acid will be damaged,the action of removing carboxyl become weak and CO2 content decrease,the pore fluid properties change gradually from acidic to alkaline.
Key words： Xihu sag; Huagang Formation; Diagenetic environment; Organic acid
LIANG Jian-she, WANG Qi, HAO Le-wei, TANG Jun, LIAO Peng, TIAN Bing . Evolution of Diagenetic Environments for Oligocene Huagang Formation Sandstone in Xihu Sag[J]. Natural Gas Geoscience, 2012 , 23(4) : 673 -680 . DOI: 10.11764/j.issn.1672-1926.2012.04.673
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