Advanced Materials Research Vols. 524-527

Abstract: According to stratigraphy and distribution features of the Qaidam Basin, and further the formation and migration of it’s depocenters, it is considered that the Middle-Upper Triassic were mainly sags scattered among the Qilian Mountains, the Alabasitao Mountains and the Kunlun Mountains; the Early Jurassic depocenters were located mainly in Lenghu depression and Yiliping sag at the northwest of the basin; several Middle Jurassic depocenters distributed from the northwest to the southeast of the basin along Sertengshan-Yuqia near front of the Qilian mountains; the Late Jurassic-Cretaceous depocenters moved east and south. The basin had been larger since the Middle Jurassic, and the sedimentary facies changed from semideep-deep lacustrine of the Early-Middle Jurassic to near-source variegated fluvial-lacustrine of the Late Jurassic and brownish red lakeshore of the Early Cretaceous.

Abstract: In the prevention and control of the mine water ，the water level of the dynamic monitoring storehouse play a pivotal role. Mine water warehouse water level measurement and control system which is designed by this paper is by programmable logic devices S7-200 and configuration king Wincc constitute a hardware and software. Between master of the computer and monitoring stations can bus is for data transmission. Laboratory simulation test and Field testing have a good effect, And it can realize the function of Sound and light alarm , dynamic display of water level-the time trend curve and data storage and reports, provide effective basis for coal mine water storehouse safety management and monitoring water-level.

Abstract: Yanglin’ao tungsten deposit is a typical mesothermal to hyperthermal filling-metasomatism postmagmatic deposit. It is featured with the structure-controlling distribution of ore-body and mineralization; while veinlet-type ore-bodies are particularly situated at the hanging wall of F24(No.24 of Fault Fracture), and the mineralization is especially concentrated below and above the unconformable surface between Proterozoic Banxi slate group and Middle DevonianYanglin’ao sandstone formation. Geological characteristics, structure forms and its formation mechanisms of ore-controlling structure were studied in this paper and a special tectonic-controlled model was initially set up. Furthermore the author also made mineralization prospecting prediction based on structure characteristics.

Abstract: Reservoir plane heterogeneity means the geometry，the scale，the continuity and the plan variation of physical properties of reservoirs, which is one of the main factors influencing the injection-production in oil reservoirs. Therefore, the study of the reservoir plane heterogeneity play a great role in guiding development wells deployment，gas reservoir well nets adjustment and residual oil & gas development. The reservoir heterogeneity of the sandstone size of gas and the border, and unbalanced formation pressure because of the degree of the development of each well is uneven prevent ChangBei gas field to develoment. They cause difficulty of evaluating the gas field comprehensive，level development wells deployment and well trajectory adjustment，and lead to certain geology risk. It is necessary to study the reservoir heterogeneity of the number 2 of shanxi Formation in this block for concerning the unfavourable extraction condition. The composite index of reservoir plane heterogeneity of the number 2 of shanxi Formation in ChangBei gas field have calculated by adopting entropy method considering influcing reservoir plane heterogeneity which is porosity, tight sandstone, mutation coefficient and variation coefficient of permeability, range of permeability and interlayer frequency. The distributive maps of reservoir's plane heterogeneity under the restriction of sedimentary facies have also been drawed. The entropy method can full use of the reduction and strengthen of entropy method,which means the characteristic of removing the similarities and depositing differences. The study indicate that reservoir plane heterogeneity of the number 2 of shanxi Formation in study area presents the medium to slightly strong characteristics in general.

Abstract: The Kalashayi sandstone reservoir deposited in tidal-flat facies. Main diagenesis include compaction, cementation and dissolution, which compaction belongs to middle-weak, point to linear contact between grains and pore-space cementation by carbonate rocks; dissolution features that feldspar grains and carbonate cementation’s dissolution. The reservoir is mesopore and medium permeability reservoir in a current depth of 4800-5300m. The reason cause this mesopore and medium permeability reservoir are considered as the following factors. The physical properties of reservoirs are mainly controlled by sedimentary microfacies and diagenesis. The strong tidal channels and tidal creaks current leads to the composition of rock mineral pure, quartz content is high, the grains coarser, good sorting and low matrix. The early compaction was so little that some pores were conserved in carbonate cementation, and in the later diagenetic process, carbonate cementation were corroded to secondary pores.

Abstract: Northern Kashi Sag is located on the northwestern periphery of Tarim Basin, China. This block has been explored for a half century, and Akmomu gas reservoir was discovered in 2001. In Northern Kashi Sag, organic-rich intervals mainly occur in Carboniferous, Lower Permian and Jurassic. Lower Cretaceous Kezilesu Formation(K1kz) is dominated by braid river succession and is best in big thickness of 385-862m，high porosity of 14.90% and high permeability of 207.00 ×10-3μm2. The first grade cap rocks are gypsolyte and mud-gypsolyte in upper Cretaceous and Paleogene with thickness of 100-200m. Two Petroleum Systems are identified, and one is J2y-N1p, Yangye Formation (J2y) serves as source rock, and Neogene Pakabulake(N1p) as reservoir rock. Another is C1+P1by-K1kz petroleum system, Lower Carboniferous and Lower Permian Biyoulieti Formation( P1by) serve as source rock, and Kezilesu Formation (K1kz) as reservoir rock. J2y-N1p petroleum system contains abundant oil sand resource. In 2001,Akmomu gas reservoir was discovered by AK＃1 in C1+P1by-K1kz petroleum system.

Abstract: In numerical simulation, the treatment of boundary conditions is of great significance. In this paper, we have deduced the one order governing equations of the acoustic wave finite-element method with perfectly matched layer (PML) for the first time. The one order equations are easier to realize than the two order form and have a good absorption effect. Then, we have analyzed the absorption effect of the absorbing boundary conditions (ABCs) and the PML. Finally, we get some useful conclusions.

Abstract: Longquna-Donggerina gold deposit of Kuze county in Qinghai province that has development value in the Langqin area in recent years,which is prospecting achievements by the sustained regional heavy mineral anomaly. By analysis on metallogenic geological setting and regional heavy mineral anomaly feature, combined with the ditailed mining area geological data , gold deposit occurs mainly sandstone and slate, and the degree of mineralization has positive correlation with magmatic activity and tectonization. Lonquna-Donggerina gold deposit had been preliminary identified that belongs to the low temperature hydrothermal fissure filling type vein deposit.

Abstract: Lignite is abundant in natural resource in china, and its production increases year by year. However, the accompanying resources in lignite have not been used effectively and comprehensively such as lignite wax, humic acid and coalbed methane (CBM), etc. We analyzed distribution and characteristics of lignite wax, humic acid and CBM in our country, and estimated its resources in the lignite main distribution area. To be specific, total resource extent of lignite wax is approximate 33.21×10⁸t; humic acid is 623.09×10⁸t and that of CBM is about 14000×10⁸m³.

Abstract: Abstract. This paper, taking Tangshan City as an example, through analysis of the ecosystem’s carrying capacity before governance, elaborates the necessity of mining subsidence control, studies three different management modes, analyses the feasibility of global ecological management mode, and, from different views, evaluates their treatment effects.