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Luo G.,Wuhan University | Luo G.,Key Laboratory of Tectonics and Petroleum Resources | Wang L.,Wuhan University
Lecture Notes in Electrical Engineering | Year: 2012

This text introduces image morphological method into digital core modeling. Five key morphological functions: Voronoi tessellation, dilation, erosion, opening and closing are interpreted to simulate the forming of sandstone. Morphology methods, cooperating with periodic boundary idea, produce a high-quality artificial sandstone core which resembles a real core not only in the respect of procedures, but also the amazing visual effects and the reservoir analytic parameters similarity. Sequential morph closing operations are applied to simulate the microscopic remaining oil distribution pattern. Future reservoir Lattice-Boltzmann[1] is promising with a firm backup of such perfect digital core. © 2012 Springer-Verlag GmbH. Source

Hu X.,Wuhan University | Ding Z.,Wuhan University | Yao S.,Wuhan University | Yao S.,Key Laboratory of Tectonics and Petroleum Resources | And 4 more authors.
Geological Journal | Year: 2016

The Great Xing′an and Lesser Xing′an ranges are characterized by immense volumes of Mesozoic granitoids. In this study, we present major and trace element geochemistry, U-Pb geochronology and systematic Sr-Nd-Hf isotopes for the representative samples, in order to constrain their petrogenesis and the tectonic evolution in NE China. The granitoids generally have high SiO2 (66.5-78.8wt.%) and Na2O+K2O (7.0-8.9wt.%) contents and belong to high-K calc-alkaline to shoshonitic series. All of them show enrichment in Rb, Th, U, Pb and light rare earth elements (LREE), and depletion in Nb, Ta, P and Ti. Zircon U-Pb dating suggests that there was continuous magmatism in both the Great Xing′an Range and the Lesser Xing′an Range during the Jurassic-Early Cretaceous interval. Seven Jurassic granitoids have (87Sr/86Sr)i values of 0.704351 to 0.707374, with εNd(t) values of -3.4 to 2.4 and εHf(t) values of 0.8 to 11.3, indicating that they originated from mixed sources involving depleted mantle and pre-existing crustal components. One Early Cretaceous sample yields (87Sr/86Sr)i value of 0.706184, εNd(t) value of 0.6, and εHf(t) values of 7.0 to 8.2, which is in accordance with previous studies and indicates a major juvenile mantle source for the granitoids in this period. In the Jurassic, the magmatism in the Great Xing′an Range was induced by the subduction of the Mongol-Okhotsk Ocean, while the contemporaneous magmatism in the Lesser Xing′an Range was related to the subduction of the Palaeo-Pacific Ocean. In the Early Cretaceous, extensive magmatism in NE China was probably attributed to large-scale lithospheric delamination. © 2016 John Wiley & Sons, Ltd. Source

Hu X.,Wuhan University | Yao S.,Wuhan University | Yao S.,Key Laboratory of Tectonics and Petroleum Resources | He M.,Wuhan University | And 2 more authors.
Acta Geologica Sinica | Year: 2015

Whole-rock geochemical, zircon U-Pb geochronological and Sr-Nd-Hf isotopic data are presented for the Early Cretaceous volcanic rocks from the northern Da Hinggan Mountains. The volcanic rocks generally display high Si02 (73.19-77.68 wt%) and Na20+K20 (6.53-8.98 wt%) contents, with enrichment in Rb, Th, U, Pb and LREE, and depletion in Nb, Ta, P and Ti. Three rhyolite samples, one rhyolite porphyry sample, and one volcanic breccia sample yield weighted mean 206pb/238U ages of 135.1±1.2 Ma, 116.5±1.1 Ma, 121.9±1.0 Ma, 118.1±0.9 Ma and 116.9±1.4 Ma, respectively. All these rocks have moderate (87Sr/86Sr)i values of 0.704912 to 0.705896, slightly negative εNd(t) values of -1.4 to -0.1, and positive em(f) values of 3.7 to 8. Their zircon Hf and whole-rock Nd isotopic model ages range from 594 to 1024 Ma. These results suggest that the Early Cretaceous volcanic rocks were originated from melting of subducted oceanic crust and associated sediments during the closure of the Mongol-Okhotsk Ocean. © 2015 Geological Society of China. Source

Hu X.,Wuhan University | Yao S.,Wuhan University | Yao S.,Key Laboratory of Tectonics and Petroleum Resources | Ding Z.,Wuhan University | He M.,Wuhan University
Mineralium Deposita | Year: 2016

The Tongshan Cu deposit is located in the northern segment of the Great Xing'an Range and represents one of the few early Paleozoic porphyry Cu deposits in northeastern China. The granitic rocks in the Tongshan Cu deposit include concealed granodiorite and exposed tonalite, which yield LA-ICP-MS zircon U–Pb ages of 478 ± 3 Ma and 214 ± 3 Ma, respectively. The granodiorite has relatively high SiO2 (60.5–63.5 wt%) and Sr (596–786 ppm) contents, low Yb (1.21–1.53 ppm) and Y (9.81–13.0 ppm) contents, and initial 87Sr/86Sr ratios (0.7038–0.7040), suggesting adakitic affinity. Combined with its positive εNd(t) values (3.5–5.4), low Mg# values (41–50), and low contents of Cr (18.6–29.0 ppm) and Ni (7.3–9.1 ppm), we propose an origin by partial melting of a juvenile mafic lower crust in a post-collisional setting after the amalgamation of the Erguna and Xing'an Blocks. The tonalite is characterized by high SiO2 (63.1–65.9 wt%) and Al2O3 (16.0–16.3 wt%) contents, low (87Sr/86Sr)i ratios (0.7041–0.7042), positive εNd(t) values (2.6–3.0), along with LILE and LREE enrichments and Nb–Ta–Ti depletions, suggesting an origin by partial melting of juvenile mafic lower crust, coupled with fractional crystallization, in a post-orogenic setting after the collision between the Xing'an and Songnen Blocks. The δD values of ore-forming fluids range from −100 to −93 ‰, and the δ18O values calculated from hydrothermal quartz are between −3 and 10 ‰. The δ34S values of sulfides vary from −2.6 to −1.1 ‰. Field observations, as well as the geochronological and H–O–S isotopic data, suggest that the Cu mineralization at Tongshan was genetically linked with the granodiorite. © 2016 Springer-Verlag Berlin Heidelberg Source

Liu G.,University of Science and Technology of China | Liu G.,Key Laboratory of Tectonics and Petroleum Resources | Liu K.,Shijiazhuang University of Economics | Wu C.,University of Science and Technology of China
Proceedings - 2010 6th International Conference on Natural Computation, ICNC 2010 | Year: 2010

Current environment of geo-visualization still has some disadvantages which mainly are: visualization entity model is not easy to be built; system software cannot support rapid modification and effectively reuse of former results; system platform cannot support consistency maintenance of visualization models. The theory and method of variant design, which has a public optimization feature, was proposed in this paper to get a better solution than parametric design method. The kernel concept of variant design and parametric design is "constraint solving" for constraint adding, deleting and maintenance. Based on the synthetic analysis and comparison of various constraint solving algorithms, the geometric constraint solving method based on Differential Evolution Algorithm (DEA) was introduced. The relative system function model and DEA procedure were put forward. Case studies of some typical graphics designs were discussed. The result indicates that variant design method can be effective in building the flexible generation environment for representation and visualization modeling of geo-spatial information. © 2010 IEEE. Source

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