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Mechanism for calcite dissolution and its contribution to development of reservoir porosity and permeability in the Kela 2.gas field,Tarim Basin,China

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Science China Earth Sciences 2008年第4期51卷 567-578页

作者： YU BingSong1,3, DONG HailLiang2.3 & RUAN Zhuang1,3 1 State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China 2.department of geology, miami University,{2., oh 45056, usa 3 Geomicrobiology Laboratory, China University of Geosciences, Beijing, 100083, China State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Beijing 100083 China department of geology Miami University Oxford OH 45056 USA Geomicrobiology Laboratory China University of Geoscien

This study is undertaken to understand how calcite precipitation and dissolution contributes to depth-related changes in porosity and permeability of gas-bearing sandstone reservoirs in the Kela 2.gas field of the Tarim Basin, Northwestern China. Sandstone samples and pore water samples are col-lected from well KL2.1 in the Tarim Basin. Vertical profiles of porosity, permeability, pore water chem-istry, and the relative volume abundance of calcite/dolomite are constructed from 3600 to 4000 m below the ground surface within major oil and gas reservoir rocks. Porosity and permeability values are in-versely correlated with the calcite abundance, indicating that calcite dissolution and precipitation may be controlling porosity and permeability of the reservoir rocks. Pore water chemistry exhibits a sys-tematic variation from the Na2.O4 type at the shallow depth (3600-3630 m), to the NaHCO3 type at the intermediate depth (3630―3695 m),and to the CaCl2.type at the greater depth (372.―3938 m). The geochemical factors that control the calcite solubility include pH, temperature, pressure, Ca2. concen-tration, the total inorganic carbon concentration (ΣCO2., and the type of pore water. Thermodynamic phase equilibrium and mass conservation laws are applied to calculate the calcite saturation state as a function of a few key parameters. The model calculation illustrates that the calcite solubility is strongly dependent on the chemical composition of pore water, mainly the concentration difference between the total dissolved inorganic carbon and dissolved calcium concentration (i.e., [ΣCO2. -[Ca2.]). In the Na2.O4 water at the shallow depth, this index is close to 0, pore water is near the calcite solubility. Calcite does not dissolve or precipitate in significant quantities. In the NaHCO3 water at the intermedi-ate depth, this index is greater than 0, and pore water is supersaturated with respect to calcite. Massive calcite precipitation was observed at this depth interval and

关键词： calcite dissolution porosity thermodynamic Tarim Basin

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Phylogeography of regional fauna on the Tibetan Plateau: A review

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Progress in Natural Science:Materials International 2009年第7期19卷 789-799页

作者： Shujuan Yanga, Hailiang Dongb,c, Fumin Lei d a State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China b Geomicrobiology Laboratory, China University of Geosciences, Beijing 100083, China c department of geology, {2. University, oxford, oh 45056, usa d Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China [a]State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Beijing 100083 China [b]Geomicrobiology Laboratory China University of Geosciences Beijing 100083 China [c]Department of Geology Miami University Oxford OH 45056 USA [d]Institute of Zoology Chinese Academy of Sciences Beijing 100101 China

The studies of uplift and glaciations of the Tibetan Plateau are summarized, and a series of recent case studies of the endemic species based on DNA sequences are detailed. In general, these molecular data show that all the organisms originated from Early Pliocene to Late Miocene, and then multi-stages of divergence/speciation occurred within each taxa following their original occupation on the plateau, mainly as a result of periodic glacial cycles and geographic isolation. The regional fauna may have undergone several range contractions and expansions during the Pleistocene glaciations. However, the population expansion and refugia may vary in space, time, and extent. The regional fauna of the Tibetan Plateau may be combinations of ancient movement from adjacent zoogeographical regions, speciation in situ, and postglacial colonization from adjacent areas. Geomorphic and climatic changes on the plateau definitely have a remarkable influence on the regional and adjacent biogeographic patterns, and the mechanism is very complex.

关键词： Divergence Refugia Postglacial colonization Phylogeography Regional fauna Tibetan Plateau

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Mineralogical and geochemical evidence for coupled bacterial uranium mineralization and hydrocarbon oxidation in the Shashagetai deposit,NW China

Mineralogical and geochemical evidence for coupled bacterial...

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中国科学院地质与地球物理研究所2.06学术年会

作者： Chunfang Cai~1,Hailiang Dong~2.Hongtao Li~1,Xinjian Xiao~3,Guanxi Ou~3, Chunming Zhang~4 1 Key Laboratory of Mineral Resources,Institute of geology and Geophysics,Chinese Academy of Sciences,P.O. Box 982.,Beitucheng Xilu No.19,Beijing 10002.,P.R.China 2.department of geology,{2. University,oxford,oh 45056,usa 3 Beijing Research Institute of Uranium geology,Beijing 10002.,P.R.of China 4 department of Geochemistry,Yangtze University,Jingzhou,Hubei 43402.,PR China

Unusual mineral structures have recently been found in a sandstone-hosted roll-type uranium deposit in the Middle Jurassic Zhiluo Formation in the Shashagetai deposit,the northern Ordos basin,NW *** structures possess a chemical composition and crystal structure characteristic of mineral coffinite[(USiO)](oh)],which occurs as nanoparticles with size ranging from 5 to *** structures are interpreted to be fossilized microorganisms,based on mineralogical biosignatures including morphology,size,occurrence of biogenic coffinite as nano-crystals,and biological elements such as *** intimate intergrowth of coffinite with secondary pyrite of bacterial origin,as defined by lowδS values,and calcite cements with petroleum-derived carbon supports its biogenic *** inclusions in the host sandstone are characterized by abundant n-alkanes,slightly increased Pr/nC and Ph/nC ratios,significant amounts of demethylated hopanes and tricyclic terpanes,and the existence of unresolved complex *** characteristics are interpreted to be a result of mixing of an earlier,heavily degraded oil with a later charged fresh oil;subsequently the oils were slightly *** lines of evidence lead to the proposal that the reduction of sulfate and oxidization of petroleum are likely synchronous with reduction of hexavalent[U(Ⅵ)]to tetravalent[U(Ⅳ)]uranium by sulfate-reducing bacteria(SRB).The discovery of a natural association of microorganism-like structures,a uranium mineral,and biodegraded petroleum has implications for uranium biomineralization and fossil fuel exploration.

关键词： uranium deposit anaerobic petroleum oxidation sulfate-reducing bacteria nanoparticle microfossil sulfur isotopes

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Mineralogical and geochemical evidence for coupled bacterial uranium mineralization and hydrocarbon oxidation in the Shashagetai deposit,NW China

Mineralogical and geochemical evidence for coupled bacterial...

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中国科学院地质与地球物理研究所2.07学术年会

作者： Chunfang Cai~(a,*),Hailiang Dong~b,Hongtao Li~a,Xinjian Xiao~c, Guanxi Ou~c,Chunming Zhang~d a Key Laboratory of Mineral Resources,Institute of geology and Geophysics,Chinese Academy of Sciences,P.O.Box 982., Beitucheng Xilu No.19,Chaoyang District,Beijing 10002.,PR China b department of geology,miami University,oxford,oh 45056,usa c Beijing Research Institute of Uranium geology,Beijing 10002.,PR China d Key Laboratory of Exploration Technologies for Oil and Gas Resources(Yangtze University),Ministry of Education, Jingzhou,Hubei 43402.,PR China

Unusual mineral structures have recently been found in a sandstone-hosted roll-type uranium deposit in the Middle Jurassic Zhiluo Formation in the Shashagetai deposit,the northern Ordos basin,NW *** structures possess a chemical composition and crystal structure characteristic of mineral coffinite[(USiO)(oh)],which occurs as nanoparticles with size ranging from 5 to 2. *** structures are interpreted to be fossilized microorganisms,based on mineralogical biosignatures including morphology,size,occurrence of biogenic coffinite as nano-crystals,and biological elements such as *** intimate intergrowth of coffinite with secondary pyrite of bacterial origin,as defined by lowδS values,and calcite cements with petroleum-derived carbon supports its biogenic *** inclusions in the host sandstone are characterized by abundant n-alkanes,slightly increased Pr/nC and Ph/nC ratios,significant amounts of demethylated hopanes and tricyclic terpanes,and the existence of unresolved complex *** characteristics are interpreted to be a result of mixing of an earlier,heavily degraded oil with a later charged fresh oil;subsequently the oils were slightly *** lines of evidence lead to the proposal that the reduction of sulfate and oxidization of petroleum are likely synchronous with reduction of hexavalent[U(Ⅵ)]to tetravalent[U(Ⅳ)]uranium by sulfate-reducing bacteria(SRB).The discovery of a natural association of microorganism-like structures,a uranium mineral,and biodegraded petroleum has implications for uranium biomineralization and fossil fuel exploration.

关键词： Uranium deposit Anaerobic petroleum oxidation Sulfate-reducing bacteria Nanoparticle Microfossil Sulfur isotopes

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Removal of Strontium from Aqueous Solution by Diatomite

Removal of Strontium from Aqueous Solution by Diatomite

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2.11 IEEE International Conference on Waste Recycling,Ecology and Environment(ICWREE 2.11)

作者： Wei ZHANG1 Faqin DONG2.* Bo WU3 Huanqing SONG4 Hailiang DONG5 1 Analytical and Testing Center Southwest University of Science and Technology Mianyang China 2.Key Laboratory of Solid Waste Treatment and Resource Recycle Ministry of Education Mianyang China 3 School of National Defense Science and Technology Southwest University of Science and Technology Mianyang China 4 School of Environment and Resource Southwest University of Science and Technology Mianyang China 5 department of geology {2. University oxford U.S.A

Diatomite was investigated as an adsorbent to remove strontium （II） from aqueous solution. The results demonstrate that diatomite can be successfully used as an adsorbent for the removal of heavy metal/ radionuclide ions from aqueous solution. PH value of the solution was an important factor for both solution chemistry of metals and adsorbent. The adsorption capacity of diatomite with strontium ions was better in acid condition. The removal rate rose as the dosage of diatomite increased, and declined as the concentration of strontium ions increased. While, the adsorption capacity declined as the dosage of diatomite increased, and rose as the concentration of strontium ions increased. The kinetics research indicated that the adsorption of strontium ions on diatomite was a rapid process. The removal rate and adsorption capacity could reach 95% of adsorption equilibrium in 60 minutes. The experimental results were fitted well to PSO kinetics model.

关键词： diatomite strontium ions adsorption PSO model

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