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Article: Kinetic modeling of diagenesis of eogene lacustrine sandstone reservoirs in the Jianghan basin, southeastern China

TitleKinetic modeling of diagenesis of eogene lacustrine sandstone reservoirs in the Jianghan basin, southeastern China
Authors
KeywordsDiagenetic fluid geochemistry
Jianghan Basin
Kinetic modeling of diagenesis
Lacustrine sandstone reservoir
Issue Date2002
PublisherKexue Chubanshe.
Citation
Chinese Journal Of Geochemistry, 2002, v. 21 n. 4, p. 298-307 How to Cite?
AbstractIn the Tuoshi oilfield, located in the Cenozoic Jianghan Basin of southeastern China, there have been found hydrocarbon reservoirs hosted in lacustrine sandstones of the Eogene Xingouzui Formation. The main diagenetic features identified in these sandstones include the dissolution of detrital K-feldspar and albite grains, the precipitation of quartz as overgrowths and/or cements, and the precipitation and/or transformation of clay minerals. These diagenetic features were interpreted to have occurred in early, intermediate and late stages, based on the burial depth. The kinetics of fluid-mineral reactions and the concentrations of aqueous species at each stage of diagenesis were simulated numerically for these lacustrine sandstones, using a quasi-stationary state approximation that incorporates simultaneous chemical reactions in a time-space continuum. During the early diagenetic stage, pore fluid was weakly acidic, which resulted in dissolution of K-feldspar and albite and, therefore, led to the release of K +, Na +, Al 3+ and SiO 2(aq) into the diagenetic fluid. The increased K +, Na +, Al 3+ and SiO 2(aq) concentrations in the diagenetic fluid caused the precipitation of quartz, kaolinite and illite. At the beginning of the intermediate diagenetic stage the concentration of H + was built up due to the decomposition of organic matter, which was responsible for further dissolution of K-feldspar and albite and precipitation of quartz, kaolinite, and illite. During the late diagenetic stage, the pore fluid was weakly alkaline, K-feldspar became stable and was precipitated with quartz and clay minerals. When the burial depth was greater than 3000 m, the pore fluids became supersaturated with respect to albite, but undersaturated with respect to quartz, resulting in the precipitation of albite and the dissolution of quartz. The diagenetic reactions forecasted in the numerical modeling closely matched the diagenetic features identified by petrographic examination, and therefore, can help us to gain a better understanding of the diagenetic processes and associated porosity evolution in sandstone reservoirs.
Persistent Identifierhttp://hdl.handle.net/10722/72411
ISSN
2015 SCImago Journal Rankings: 0.180
References

 

DC FieldValueLanguage
dc.contributor.authorNi, Sen_HK
dc.contributor.authorQing, Hen_HK
dc.contributor.authorTang, Jen_HK
dc.contributor.authorZhou, Men_HK
dc.contributor.authorLi, Zen_HK
dc.date.accessioned2010-09-06T06:41:31Z-
dc.date.available2010-09-06T06:41:31Z-
dc.date.issued2002en_HK
dc.identifier.citationChinese Journal Of Geochemistry, 2002, v. 21 n. 4, p. 298-307en_HK
dc.identifier.issn1000-9426en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72411-
dc.description.abstractIn the Tuoshi oilfield, located in the Cenozoic Jianghan Basin of southeastern China, there have been found hydrocarbon reservoirs hosted in lacustrine sandstones of the Eogene Xingouzui Formation. The main diagenetic features identified in these sandstones include the dissolution of detrital K-feldspar and albite grains, the precipitation of quartz as overgrowths and/or cements, and the precipitation and/or transformation of clay minerals. These diagenetic features were interpreted to have occurred in early, intermediate and late stages, based on the burial depth. The kinetics of fluid-mineral reactions and the concentrations of aqueous species at each stage of diagenesis were simulated numerically for these lacustrine sandstones, using a quasi-stationary state approximation that incorporates simultaneous chemical reactions in a time-space continuum. During the early diagenetic stage, pore fluid was weakly acidic, which resulted in dissolution of K-feldspar and albite and, therefore, led to the release of K +, Na +, Al 3+ and SiO 2(aq) into the diagenetic fluid. The increased K +, Na +, Al 3+ and SiO 2(aq) concentrations in the diagenetic fluid caused the precipitation of quartz, kaolinite and illite. At the beginning of the intermediate diagenetic stage the concentration of H + was built up due to the decomposition of organic matter, which was responsible for further dissolution of K-feldspar and albite and precipitation of quartz, kaolinite, and illite. During the late diagenetic stage, the pore fluid was weakly alkaline, K-feldspar became stable and was precipitated with quartz and clay minerals. When the burial depth was greater than 3000 m, the pore fluids became supersaturated with respect to albite, but undersaturated with respect to quartz, resulting in the precipitation of albite and the dissolution of quartz. The diagenetic reactions forecasted in the numerical modeling closely matched the diagenetic features identified by petrographic examination, and therefore, can help us to gain a better understanding of the diagenetic processes and associated porosity evolution in sandstone reservoirs.en_HK
dc.languageengen_HK
dc.publisherKexue Chubanshe.en_HK
dc.relation.ispartofChinese Journal of Geochemistryen_HK
dc.subjectDiagenetic fluid geochemistryen_HK
dc.subjectJianghan Basinen_HK
dc.subjectKinetic modeling of diagenesisen_HK
dc.subjectLacustrine sandstone reservoiren_HK
dc.titleKinetic modeling of diagenesis of eogene lacustrine sandstone reservoirs in the Jianghan basin, southeastern Chinaen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1000-9426&volume=21&spage= 298&epage=307&date=2002&atitle=Kinetic+modeling+of+diagenesis+of+eogene+Lacustrine+sandstone+reservoirs+in+the+Jianghan+basin,+southeastern+Chinaen_HK
dc.identifier.emailZhou, M:mfzhou@hkucc.hku.hken_HK
dc.identifier.authorityZhou, M=rp00844en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-2242472078en_HK
dc.identifier.hkuros82681en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-2242472078&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume21en_HK
dc.identifier.issue4en_HK
dc.identifier.spage298en_HK
dc.identifier.epage307en_HK
dc.publisher.placeChinaen_HK
dc.identifier.scopusauthoridNi, S=7101821807en_HK
dc.identifier.scopusauthoridQing, H=7005723568en_HK
dc.identifier.scopusauthoridTang, J=25932412600en_HK
dc.identifier.scopusauthoridZhou, M=7403506005en_HK
dc.identifier.scopusauthoridLi, Z=7409079920en_HK

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