Subscription for Journal of China University of Geosciences

JournalofChinaUniversityofGeosciences (inEnglish) (ISSN 10 0 2 - 0 70 5 ) ,startedin 1990 ,isage ologicalmagazinepublishedquarterlybytheuniversityforthedisseminationofinformationonallbranchesofgeologyandassociatedtechnologyintheexplorationandutilizationofearthresources.Itreportstheessentialre searchfindingsandtheoriginallyacademicthinkingsforsustainabledevelopments .Articlesarewelcomefrombothdomesticandoverseascientistsonrelatedsubjects .ItislistedorabstractedinChemicalAbstracts (CA ) ,Cu…     

Method of Numerical Modeling for Constitutive Relations of Clay

INTRODUCTIONThe mechanical responses of soils are more com-plicated compared with metals.By comparing thephysical and mechanical properties of the metals withsoils,Lade(1988)found that there are17differentpoints between the metals and soils,which differfrom metals inthree basic mechanical characteristics:pressure sensitivity,dilatancy,and dependence ofstress path.Wang(2004)proposed a principle of theinteraction between plastic volume and shear strains,that is,there are two relatively inde…     

Methods for Calculation of Geogenetic Depth

Some current methods for the calculation of the geogenetic depth are based on the hydrostatic model, it is induced that the depth in certain underground place is equal to the pressure divided by the specific weight of rock, on the assumption that the rock is hydrostatic and overlain by no other force but gravity. However, most of rock is in a deformation environment and non-hydrostatic state, especially in an orogenic belt, so that the calculated depth may be exaggerated in comparison with the actual depth according to the hydrostatic formula. In the finite slight deformation and elastic model, the relative actual depth value from the 3-axis strain data was obtained with the measurement of strain including that of superimposed tectonic forces but excluding that of time factor for the strain. If some data on the strain speed are obtained, the depth would be more realistically calculated according to the rheologicai model because the geological body often experiences long-term creep strains.     

Examination of Some Commonly Used Equations of State for Supercritical Water

Please refer to the attachment(s) for more details.     

Study of the Stability of Aluminophosphate Glasses–Matrices for Immobilization of Radioactive Waste

Doklady Earth Sciences - Liquid radioactive wastes of the reprocessing of spent nuclear fuel are included in a glassy Na–Al–P matrix for subsequent placement in underground storage....     

Degradation of Microbes for the Crude Oil Contaminants

Production and storage-transportation of crude oil can not only give rise to soil pollution but also destroy ecological environment．Degradation of microbes for oily soil was studied with the strument，Geofina Hydrocarbon Meter（GHM），by experimental analysis qualitatively and quantitatively in the paper．Analytical result showed that the crude oil could be considerably degraded by eating-oil microbes in oily soil and the number of eating-oil microbes increased while the working hours of oil-well rising．As a result，contaminated oil could be degraded more quickly by a lot of eating-oil microbes in the soil．At the same time，the degradation rate of contaminated oil increased gradually as the time went on．In addition，amount of gaseous component in the oily soil samples increased with degraded time and the microbes could selectively consume contaminated oil strongly，so biodegradation might alleviate the degree of contamination and destruction to the soil and environment in the process of oil production at oilfield．The law of oily soil degraded by microbes was investigated and some useful conclusions were drawn in the paper．     

Simulation–Regression Approximations for Value of Information Analysis of Geophysical Data

Value of information analysis is useful for helping a decision maker evaluate the benefits of acquiring or processing additional data. Such analysis is particularly beneficial in the petroleum industry, where information gathering is costly and time-consuming. Furthermore, there are often abundant opportunities for discovering creative information gathering schemes, involving the type and location of geophysical measurements. A consistent evaluation of such data requires spatial modeling that realistically captures the various aspects of the decision situation: the uncertain reservoir variables, the alternatives and the geophysical data under consideration. The computational tasks of value of information analysis can be daunting in such spatial decision situations; in this paper, a regression-based approximation approach is presented. The approach involves Monte Carlo simulation of data followed by linear regression to fit the conditional expectation expression that is needed for value of information analysis. Efficient approximations allow practical value of information analysis for the spatial decision situations that are typically encountered in petroleum reservoir evaluation. Applications are presented for seismic amplitude data and electromagnetic resistivity data, where one example includes multi-phase fluid flow simulations.     

Biological reduction of sulfate for wastewater containing copper

A process for the treatment of wastewater containing copper in an anaerobic sludge bed reactor has been studied. Sulfate-reducing bacteria （SRB） were cultivated in an anaerobic sludge bed reactor. When the concentrations of Cu^2＋ in influent were 85 mg/L, the reactor could be successfully operated. Under this condition the removal rates of Cu^2＋ and COD were 98.8% and 78.3%, respectively. When the retention time was 8 h, the removal rate of Cu^2＋ did alter significantly and only can reach 81.9%. When the concentrations of Cu^2＋ was less than 300 mg/L, the reactor operated successfully. When the Cu^2＋ concentration in influent was higher than 400 mg/L, the activity of the sulfate-reducing bacteria was suppressed by Cu^2＋.     

Applicability of Statistical Learning Algorithms for Spatial Variability of Rock Depth

Two algorithms are outlined, each of which has interesting features for modeling of spatial variability of rock depth. In this paper, reduced level of rock at Bangalore, India, is arrived from the 652 boreholes data in the area covering 220 sq⋅km. Support vector machine (SVM) and relevance vector machine (RVM) have been utilized to predict the reduced level of rock in the subsurface of Bangalore and to study the spatial variability of the rock depth. The support vector machine (SVM) that is firmly based on the theory of statistical learning theory uses regression technique by introducing ε-insensitive loss function has been adopted. RVM is a probabilistic model similar to the widespread SVM, but where the training takes place in a Bayesian framework. Prediction results show the ability of learning machine to build accurate models for spatial variability of rock depth with strong predictive capabilities. The paper also highlights the capability of RVM over the SVM model.     

A Scheme of the Hierarchy for Sequence Stratigraphy

Inthelasttwodecades,sequenCestratigraphyhasbecomethecornerstoneofmodernstratigraphyandhasbeenwidelyusedbothintheexplorationofoilandgasandinthestudyofregionalgeology.Assequencestratigraphyhasextendedfromundergroundinvestigationsbyseismicmethodstooutcropstudiesbyordinary$tratigraphicapproaches,andasithasgrownintoamoreorlessmaturebranchofstratigraphicaldisciplines,theestablishmentofarelevanthierarchyofthesequencestratigraphictntSseemstohavebecomeoneoftheurgefltrequire~,especiallyasthereexistsomec…     

Degradation of Microbes for the Crude Oil Contaminants

Production and storage-transportation of crude oil can not only give rise to soil pollution but also destroy ecological environment. Degradation of microbes for oily soil was studied with the instnunent, Geofina Hydrocarbon Meter (GHM), by experimental analysis qualitatively and quantitatively in the paper. Analytical result showed that the crude oil could be considerably degraded by eating-oil microbes in oily soil and the number of eating-oil microbes increased while the working hours of oil-well rising. As a result, contaminated oil could be degraded more quickly by a lot of eating-oil microbes in the soil. At the same time, the degradation rate of contaminated oil increased gradually as the time went on. In addition, amount of gaseous component in the oily soil samples increased with degraded time and the microbes could selectively consume contaminated oil strongly, so biedegradation might alleviate the degree of contamination and destruction to the soil and environment in the process of oil product     

Evaluation of Two Absolute Radiometric Normalization Algorithms for Pre-processing of Landsat Imagery

INTRODUCTIONMultitemporal satellite i magery has long beeninvolvedin the detection of changes occurringin nat-ural ecosystems . The accuracy of the result largelyrelies onthe consistency of at mospheric andillumina-tion conditions of the multitemporal i mages used.However ,the date and seasonal variations resultingin different at mospheric and illumination effects usu-ally cause errors in change detection results . Accord-ingly ,pre-processing of multitemporal i magery usingabsolute or re…     

Equation of state of magnesite for the conditions of the Earth’s lower mantle

A semiempirical equation of state was derived for magnesite under the thermodynamic conditions of the Earth’s mantle. Within experimental uncertainties, it is consistent with thermochemical, ultrasonic, X-ray, and shock-wave data at temperatures from 15 K to the melting point and pressures of up to 100–130 GPa. The following values were recommended for the isothermal bulk modulus and its pressure derivative: K _T = 111.71 GPa and K′ = 4.08. Thermodynamic analysis showed that magnesite does not decompose to periclase and CO₂ under the thermodynamic conditions of the Earth’s lower mantle and outer core.     

Oxidation Experiment of Natural Megacrystal Ch'nopyroxene: Implications for Assignment of Mossbauer Spectra

The Mossbauer spectra of natural megacrystal clinopyroxene are usually fitted by 4 sets of symmetric doublets, A-A', B-B', C-C' and D-D', respectively, in terms of increasing Qs value in literature. But the assignments of those doublets are quite different, except the D-D' doublet assigned to Fe3+ at the lattice site Ml in previous papers. Particularly, the assignment and interpretation of the C-C' doublet are diverse.The oxidation experiments of natural megacrystal clinopyroxene collected from the Hannuoba basalt, North China, were performed under controlled conditions of temperature at 1000℃ and oxygen fugacity of FMQ buffer in 1, 2, 3 and 5 days respectively. The oxidized samples were then measured by X-ray diffraction spectrometry and Mossbauer spectrometry. The oxidation of clinopyroxene is characterized by Fe2+→ Fe3+ at Ml under the subsolidus conditions, which is consistent with the increase of the area of the D-D' doublet when the heating time increases. Accordingly, the area of the A-A' and B