Applied Mechanics and Materials Vol. 737

Abstract: Based on the new round of national potential evaluation on coal resources, and reference to the latest achievements about regional geological and energy basins, this article analyzed the main features of North China coalfield structure. According to the main features of North China coalfield structure and the distribution of North China coal series, the boundary of North China coal-bearing tectonic region and the division of North China coal-bearing tectonic units were identified. North China coalfield tectonic region can be divided into 5 coal-bearing tectonic sub-regions and 22 coal-bearing tectonic zones. The basic characteristics of the tectonic structure and its influence upon coal series distribution in each coal-bearing tectonic zone were systemically discussed.

Abstract: China uranium mineralization in accordance with different metallogenic host rocks are mainly divided into four types: granite type uranium mineralization, volcano rock type uranium mineralization, the carbonate-siliceous-politic rock type and sandstone type uranium mineralizations, four types of uranium mineralization is due to different genesis and metallogenic environment, the indicator elements also have bigger difference. In this paper, through the national uranium resources potential evaluation project research results, describes characteristics of indicator elements of four types uranium mineralization, and from the perspective of element geochemistry, analyzes causes of the indicator elements combination.

Abstract: Due to a small amount of test and dynamic data in the early development, it is unable to quickly and accurately predict the reservoir capacity. In this paper, we use the logging data of a block of sand four in Song Liao Basin to identify the evaluation methods that the key factors affecting the reservoir capacity. On this basis, the establishment of a relational model of reservoir oil permeability and productivity indices for predicting the reservoir capacity rapidly in early development. It has higher forecast accuracy by comparison with the measured values.

Abstract: Copper ore is the main mineral for the large deposits. Copper minerals are mostly consisting of chalcopyrite, secondly consisting of bornite, there are traces of processing copper blue and malachite, the mineral is disseminated by coarse granularity. This mineral is easy to processing. Production process was using by the process of grinding-flotation. After grinding fineness, lime dosage, sodium sulfide dosage, collector and frother dosage, were determined by the open test. Closed circuit experiment was conducted by those optimal conditions identified in the above test, the recovery of copper concentrate is 88.38% and the grade of copper concentrate is 14.37%.

Abstract: the risk assessment for development project is simply and highly efficient, requires less data, and can clearly uncover the problems. It is plausible to evaluate a plenty of development projects through computers

Abstract: In order to guarantee the safety of the coal mine, needing to leave in reasonable waterproof safety coal pillar. Aiming at the working face 3311 of Xuchang coal mine, this article based on the analysis to the basis of factors for improving the mining limit, using UDEC numerical simulation, the regulations of coal mining under buildings, railways and water bodies and historical experience to analyze crack-production ratio of the working face, study the height of water flowing fractured zone development, designing test mining program. Through the upper mining limit to liberate 160000t coal resources and to gain the obvious economic benefits, which provide important significance for other similar coal mines in coal field of North China area.

Abstract: Thermal recovery is a common and effective method for producing heavy oil. Casing failure is a serious problem in thermal recovery wells. In view of this problem, it is proposed the technique of casing cementing with internal pre-expansion for thermal recovery well. It refers to exert inner pressure on payzone production casing or heat payzone production casing to a certain temperature and make payzone production casing expand in cement solidifying period. We developed simulating experiment table according to field practice and pre-expansion cementing theory. It can simulate cementing technology with conventional, half warm-up and internal pre-pressurization cementing technology, also include steam injection and production process. The technique will be an important foundation for the following field tests and its application.

Abstract: The northwest of Heilongjiang province is a very important mineral site of precious metals and has always been a occurrence place of Placer gold. On the basis of analysis and study of ore-forming geological settings, geophysical and geochemical features of the ore belt, the authors have concluded the metallogenic essential factor , Prospecting factor and have established the Gold Placer Synthetic informational Prospecting Model of northwest of Heilongjiang province .

Abstract: The hydrocarbon reservoirs which have been found in SZ36-1 region are located in Liaoxi low uplift and dominated by structural traps. The principle source rock is the first and the third member of the Neogen Shahejie Formation and the main reservoir type is delta sand body which mainly located in the second member of Shahejie Formation. Oil reservoirs are mostly in normal pressure and are possess characteristic of late hydrocarbon accumulation. Hydrocarbon accumulation is mainly controlled by fault,reservoir-cap rock combination, and petroleum migration pathways. Lateral distribution of hydrocarbon reservoirs is mostly controlled by reservoir rocks, while the vertical distribution is controlled by fault.

Abstract: In order to obtain the characteristics of in-situ stress distribution in ZhuJixi coal mine areas, and provide the powerful basis for the design of the roadway, the typical roadway of Zhujixi coal mine was measured by the hollow inclusion method. The measurement results showed that the maximum and minimum principal stress in the mining area were for nearly horizontal direction, and the intermediate principal stress was for nearly vertical direction; The maximum ratio of the stress was 1.55 by comparing vertical principal stress and the maximal horizontal principal stress, so the mining area was for the high stress area; Through estimating depth of about 950 m of the horizontal and vertical stress, could know the theory results were basically smaller than test results by comparing with the field test results, this showed that the area was given priority to with horizontal tectonic stress, belonged to the Earth dynamical field type. We used the test results to evaluate the supporting effect of the roadway by the theoretical analysis, numerical simulation method.