Advanced Materials Research Vols. 524-527

Abstract: By using the data of drilling and logging and other materials, the contour graph of the thickness of the remnant strata can be worked out. After the compaction restoration of the graph, the original sedimentary thickness of the First Member of Kongdian Formation(Ek1) and the Lower Part of the Fourth Member of Shahejie Formation ( lower Es4) can be obtained and their palaeogeomorphology can be reconstructed. The research results show that palaeogeomorphology has an obvious control on the sedimentary systems of Ek1 and lower Es4. In the areas with higher mountains and steeper slopes in the northern basin, there mainly develop nearshore subaqueous fans while in the south of the basin, there mostly develop alluvial fans.

Abstract: How to resolve the resources exploration in deep and surrounding of the crisis mines is a very urgent problem which confronts with mining industry. Choosing the suitable prediction theory and technology is the key to success in evaluating. According to the particularity of resource exploration in deep and surrounding of crisis mines and application at domestic and international, author analyzes the regional minerogenic geological setting, structure and lithogeochemistry characteristic, predicates surrounding favorable region –Huangni po by using the geochemical appraisal criteria of primary halo which obtain from Shiyingtan gold deposit as similarity analogy principle. The results of predication have been proved in exploration.

Abstract: This article introduces the contrast of the Proterozoic strata division and the ore-bearing horizon of the polymetallic deposits like iron and copper by taking advantage of the field geological investigation and the geological characteristic of mineralization to further analyze the ore-prospecting prospects in the area.

Abstract: Aiming at the issues for 3-dimensionals localization and quantitative prediction of concealed ore body in the deep and margin parts of the Fenghuangshan ore field in Tongling, Anhui, a quantitative analysis method for geological ore-controlling factors is proposed. Firstly, based on the analysis of metallogenic conditions and integrated geological exploration data, the three-dimensional shapes of the ore-controlling geological bodies such as strata, structures, magmatic bodies and ore bodies were inferred and simulated in three-dimensional visualization environment by dint of three-dimensional geological modeling technology. Secondly, from the three-dimensional grid geological models, some 3-dimensional shapes of some complex ore-controlling geological bodies with overlay surfaces, were analyzed by morphological operations and extracted as the geological ore-controlling factors. Lastly, the field models of various geological ore-controlling factors, including the magmatic body and its surface relief, the contact zone, the strata, the faults and so on, were set up to describe quantitatively geological ore-controlling effects. By analyzing quantitatively the associated relationship between the geological ore-controlling factors and the mineralization distribution, It is proved that the extracted geological ore-controlling factors have more powerful controlling effects on mineralization spatial distribution. The method is feasible to gain the quantitative geological ore-controlling indexes for indicating the ore-formation advantage degree.

Abstract: There are low porosity and permeability in the Jurassic sandstone in the Yongjin Block, Junggar Basin. Reservoir is main controlled element of petroleum accumulation. It is adverse to hydrocarbon pool. However, unconformity effectively promotes the porosity and permeability of sandstone under it. An important unconformity between Jurassic and Cretaceous Periods developed in the central Junggar Basin. The chemical index of alteration (CIA) values indicate that it experienced physical weathering during development, transported the matrix off the semi-weathering rock, and consequently improved the reservoir quality of sandstone. Water with organic acids that are generated during organic matter maturation could dissolve the feldspar in semi-weathered zone, and would remove the dissolved products from the sandstone. All these would further improve reservoir quality. There are tight sandstone of the Jurassic which is adverse to hydrocarbon accumulation. However, because unconformtiy ocured and experienced the reservoir-improved geologic progresses. The semi-weathered zone of J/K unconformity became the preferred pathway for petroleum migration due to these two geological processes. The Paleo-soil layer on top of the J/K unconformity formed a good trap for the passing hydrocarbons, and accumulated it to become a commercial petroleum pool.

Abstract: Under the action of surface-underground unite mining, Slope stability is related to underground mining location and mining space dimension, This paper studies the underground mining of slope outer region on slope stability influence characteristic; With the increase of mining width stability coefficient increases, when mining width reach a certain value stability coefficient tends to constant; With the increase of mining depth stability coefficient increases, when mining depth reaching a certain value stability coefficient began to decrease; this show that the underground mining has a direct effect on slope stability, its size needs a combination of their relative spatial position relation and mining geometric size to determine.

Abstract: The coal face of blasting mine in underground coal mine is a very complicated system of disaster environment, the spatio temporal limit increases the accident probability of blasting operations. So the safety appraisement method of safety engineering was applied. Through marking the potential tendency of the serious injury and the control level, the serious injury possibility of this operation is analyzed, and the safety technical measures and management measures to improve the safety in the implemention are put forward.

Abstract: Coal accumulation of Lower Member of Shanxi Formation in Northwest part of Ordos basin has been researched according to the principle of base level cycle based on outcrops, core description, and well log. Sedimentary face analysis, base level correlation, condense data controlling mapping were adopted. Coal forming has a close relation to base level cycle, face distribution, and coal-forming latter stage of short-term base level ascending cycle. Coal measure distribution has a complementary relationship with distributary channel. In peat swamp far from distributary channel, coal layer has greater thickness, with lower ash content, and lack of waste rock interlayer. Near the distributary channel, coal layer is thinner and sparsely-distributed, with high ash content, and transition to clastic rock. From shan2³ to shan2¹, thick coal layer has a trend of retreat towards north, showing that the lower member of Shanxi Formation constitutes mid-term base level ascending cycle.

Abstract: With the surface movement observation data derived from subcritical mining, Matlab curve fitting is applied to calculate predicting parameters of the probability integral method. Other conditions kept unchangeable, the size of the working face is extended to achieve full exploitation degree. The displacement and horizontal strain values are calculated by use of the probability integral method, and the subsidence, slope, curvature, horizontal strain curves are generated, thus, the displacement angles of strata under the condition of critical mining are consequently inversed. It is of theoretical significance and of practical value for delimiting the damaged scope and designing the protection pillar size reasonably.

Abstract: Yaguila Pb-Zn polymetallic deposit in Tibet is discovered through geochemical exploration techniques. The deposit is located in the eastern section of Longmala-Yaguila fault sag belt in the area of Nyainqentanglha Range. The ore bodies lie in the lithologic interface between tuffaceous sandstones and iron-manganese banded marbles in the Upper Carboniferous-Lower Permian Laigu formation. They occur in bedded and stratoid forms and are consistent with the attitude of strata. The paper reviews the process of discovering the deposit, and analyzes the important role of geochemical exploration in prospecting in the research area. It studies the geological characteristics of ore-forming, distribution of elements and features of anomalies, and finds out the Carboniferous- Permian is the main horizon Pb-Zn polymetallic anomalies form. The deposit type is submarine exhalative sedimentary-magmatic hydrothermal superimposition Pb-Zn polymetallic deposit. Furthermore, the paper also establishes a geology-geochemistry prospecting model for the research area and gives some suggestions to the further work, being of great significance in guiding geological prospecting in the research area.