Applied Mechanics and Materials Vols. 295-298

Abstract: In this paper, the influencing factors of the Young’s modulus of coals were investigated by measuring the stress-strain behaviors under different confining stress and water ratio conditions and constituents for 13 anthracite coal samples obtained from the southern Qinshui basin of China. The results show that: (1) For a coal, its Young’s modulus increases in the form of convex increasing parabolic curve with increasing confining stress acting on the coal but reduces with increasing water ratio in the form of convex decreasing parabola. (2) The Young’s modulus of coals is negatively proportional to fixed carbon and vitrite contents; while it positively related to inertite content. The Young’s modulus of coals becomes remarkable when ash yield is of larger than about 11%. The coals with 60% vitrinite and 40% inertinite contents have the maximum Young’s modulus.

Abstract: Because of the limited hardware technical level, we seldom use the three-dimensional geological model with a huge amount of data directly for numerical simulation, we must reduce the amount of data.In this paper we use a part of some oilfield as an example, we scale down the parameter of permeability by the harmonic mean method and we use the grid backfilling technology for parts which have interbeds or strong heterogeneity. We evaluate scale-down model by contrast of model maps, colour graphs of frequency distribution, heterogeneous parameters, errors compare, correlation coefficients compare and calculation time-consuming. The scale-down geological model has less grids and maintains reservoir heterogeneity.

Abstract: Besides coal seam, the source rocks including dark mudstone, carbon mudstone and so on account for a large proportion in the coal measures. Based on the complex geothermal evolution history, the majority of coal measure organic matters with the peak of gas generation have a good potential of gas. Therefore, shale gas in coal measure is an important part of the shale gas resources. There are good conditions including the thickness of coal measures, high proportion of shale rocks, rich in organic matter content, high degree of thermal evolution, high content of brittle mineral and good conditions of the porosity and permeability for the generation of shale gas in Wuli area, the south of Qinghai province. Also the direct evidence of the gas production has been obtained from the borehole. The evaluation of shale gas in coal measure resources could broaden the understanding of the shale gas resources and promote the comprehensive development of the coal resources.

Abstract: When we treat coalseam which is thicker and complicated, we can use kriging modeling coalseam and interlayer, then we minus prediction surface; by comparing different effect between traditional method and geostatistics to reserves calculation and coalseam thickness prediction, the paper shows advantage of using of geostatistics in analysis of coalseam thickness and bring a new method of treating coalseam containing many dirt bands.

Abstract: As an important part of spatial data, remote sensing data also has the characteristic of uncertainty existing in data acquisition, data pre-processing, information extraction, information classification and information evaluation. To these characteristics, concepts of remote sensing mineralized alterations repeatability was put forward. Using Duolong porphyry copper deposit, Tibet as an example, data repeatability was discussed. Results show that the same sensor of remote sensing mineralized alterations were similar under circumstance of time phase which does not vary much, but the results will be partially different when the anomaly classes meets together.

Abstract: The stratigraphy developmental model for Putaohua oil layer of Songfang oilfield in the northern Songliao basin are studied by using the data of core, well log, mud log and regional geology. The possible developmental models for target oil layer are each layer onlap thinning, each layer gradually thinning, truncated thinning and early foreset later structural uplift. And Putaohua oil layer is proved to be the each layer onlap thinning model with along source onlap features.

Abstract: Based on the data of core, well log, mud log and regional geology, the different type of sandbody was studied quantitatively on the northern Putaohua reservoir in Songliao basin by using the following indicators, they are average thickness, thickness standard deviation, thickness skewness, thickness peakedness, width, width to thickness ratio, length, length to thickness ratio, channel divaricating angle α, channel divaricating normal angle β. And then the sandbody distribution characteristics for different sedimentary face were studied in detail.

Abstract: It is much more difficult to estimate magnetotelluric(MT) impedance tensor in the sites which are contaminated by high noise. In order to estimate a precise impedance tensor, we examine a new method called independent component analysis (ICA) that is developed to remove the noise in the recorded data. ICA is a time series analysis method, in which complicated data sets can be separated into all underlying sources without knowing these sources or the way that they are mixed. In this paper, we use the ICA method to process real MT data. All results show that apparent resistivity and phases which are preprocessed by ICA and derived from impedance tensors are generally more stable than only robust processing. These results reveal that ICA has the potential to handle noisy data.

Abstract: Frame theory is an important field of wavelets analysis research, also a hot issue. In this paper, we give a sufficient and necessary of sibling frame with dilation factor a from vanishing-moment recovery function. This condition provides a method of designing sibling frame with vanishing-moment.

Abstract: It is a breakthrough exploratory area about sandstone-type uranium deposit of Bayanwula area in Erlian basin, Inner Mongolia, a detailed study of the form of occurrences . Ore-bearing horizon is the down cretaceous Saihan formation in Bayanwula area. Study on uranium occurrences which is significance for Uranium mining smelting.The host rocks are gray silt - fine sandstone, gray medium - fine sandstone, yellow medium - fine sandstone . The EPMA(electron probe microanalysis) results show that the uranium minerals are mainly pitchblende, coffinite, uranyl-carbonate, uranothorite, isomorphous uranium and uranium bearing phosphate. among which, the uranothorite and isomorphous uranium are of no industrial significance, uranium mineralization closely occurs with pyrite, ilmenite, quartz, feldspar, rare earth and organic matter.