Advanced Materials Research Vols. 962-965

Abstract: The acquisition of the total organic carbon (TOC) content mainly relies on the geochemical analysis and logging data. Due to geochemical analysis is restricted by coring and experimental analysis, so it is difficult to get the continuous TOC data. Logging evaluation method for measuring TOC is very important for shale gas exploration. This paper presents a logging evaluation method that the shale is segmented according to sedimentary structures. Sedimentary structures were recognized by core, thin section and scanning electron microscope. Taking Wufeng-Longmaxi Formation, Silurian, Muai Syncline Belt, south of Sichuan Basin as research object, the shale is divided into three kinds: massive mudstone, unobvious laminated mudstone, and laminated mudstone. TOC within each mudstone are calculated using GR, resistivity and AC logging data, and an ideal result is achieved. This method is more efficient, faster and the vertical resolution is higher than △logR method.

Abstract: We analyzed the petrology characteristics of Denglouku formation reservoir in Changling fault depression, by 47 ordinary thin sections, 42 thin casting sections, 30 scanning electron microscopy samples and 19 cathodoluminescent samples. The results show that: the main rock types are feldspar debris sandstone and debris feldspar sandstone. The reservoir consists of low compositional maturity, relatively poor psephicity, well graded, high rock debris content. It suggests that the sedimentary environment has strong energy, the moving distance is short, the study area is near the mother rock zone. From north to south, granularity gets coarse. The main cement types are carbonate and argillaceous.

Abstract: The three-dimensional resistivity tomography technology with the variable electrode distance which has been applied on the multi-metal exploration can get good results. The three-dimensional observation system can be a one-time set when using the integrated electromagnetic method system. Then the three-dimensional resistivity information of the surveyed area can be measured by high-power measurement with a series of different power supply electrode distance. This technology has the advantages of abundant information, high production efficiency, and it has practical value for the multi-metal mineral exploration.

Abstract: Based on data envelopment analysis (DEA) approach ,use the 11 prefecture-level city in Hebei Province as the research object, selects indicators of the inputs and outputs categories of the mineral resource development and utilization of the year of 2007 , analyzes mineral resources development utilization efficiency of the prefectural-level city in Hebei, including overall efficiency, technical efficiency and scale efficiency. The results show that: the efficiency in the development and utilization of mineral resources throughout the prefecture-level cities in Hebei exists regional differences. On this basis, made recommendations accordingly.

Abstract: In the background of low-carbon economy, the development of geothermal resources has many benefits, which will promote energy conservation, help to improve the energy consumption structure. The occurrence state of geothermal resources in high-tech zone of Baotou is described in detail, including geothermal storage layer, geothermal storage cap rock, geothermal channel and heat, and its hydrogeochemical characteristics. The genetic mechanism of geothermal resources is analyzed. The temperature of deep geothermal is predicted. The prediction is proved that it has a certain reliability.

Abstract: Saidu gold deposit, located in back arc basin at south margin of the west Altay Mountain, is orogenic gold deposit. It is strictively controlled by ductile-shear zone, occurring in altered mylonite zone of Mar-kakol giant belt. The δ³⁴S values of pyrite in the gold deposit range from 3.53‰ to 5.88‰; the lead isotopic compositions are fairly constant, with ²⁰⁶Pb/²⁰⁴Pb ranging from 18.010 to 18.359, ²⁰⁷Pb/²⁰⁴Pb ranging from 15.488 to 15.579, and ²⁰⁸Pb/²⁰⁴Pb ranging from 38.1116 to 38.3551. Sulfur and lead isotope studies indicated that ore-forming materials originated from the deep portion, and had close relationship with magmatic activity. The ore materials were obtained from rocks of the lower crust during the orogenic period; the main gold mineralization should have relations with tectonic extention settings of post-collision orogenic.

Abstract: Based on the structural interpretation of seismic data, we analyzed the gas controlling effects of folds and faults on CBM accumulation qualitatively. Meanwhile, we discussed the lateral sealing ability of the major overthrust faults quantificationally by bringing in “Shale Gouge Ratio (SGR)”, which is proved to be applicable in analyzing the gas controlling effects of faults. The results of the theoretical analysis show that overthrust faults have better sealing effects than normal faults, and synclines are more conducive to CBM accumulation than anticlines. The SGR computed results show a high consistency with the distribution characteristics of the CBM gas content. In all, the folds have little controlling on CBM accumulation, and the faults play a major role in the gas controlling on CBM accumulation in the Weibei CBM field.

Abstract: In this study, data from 244 CBM production wells were collected and analyzed in China. Based on the data, coalbed methane (CBM) reservoir properties and geological factors were studied. Combined with previous study results, the current situation of CBM resource evaluation, the classification of evaluation indexes and evaluation standard were analyzed. Finally, the evaluation system aiming at deep coal seam CBM was suggested. This system tries to provide important theoretical and technical support to CBM exploration and geological target selection evaluation for deep coal seams in China. This will provide important guideline and technical support to CBM exploration and geological target selection evaluation in deep coal seam CBM in China.

Abstract: According to the cores, outcrops, seismic data and wire-line logs, the main influences exerted by slope gradient on sedimentation of lacustrine delta are as follows: 6 kinds of microfacies assemblages are recognized in the elaborate development area and 3 sequences of these assemblages are identified in the well correlation along provenance; the bars-rich delta front is developed in steep slope while the river-rich delta front in gentle slope. The exploration and development experience indicate the reservoirs formed in steep area are favorable for well-connected sandbodies and high sand-bearing ratios.

Abstract: In order to find out the spatial shape of a granite rock-mass, three kinds of data can be used:1) The exploration data (drilling data, geological profile data, geological boundaries and so on); 2) The ridge extension line data applied to speculate the concealed granite rock-mass based on low magnetic-anomaly zone (△T≤50nT) from high-precision magnetic-prospecting and Controlled-Source Audio-Frequency Magnetotelluric (CSAMT) results; 3) The other interpolated data of concealed granite rock-mass boundary on CSAMT comprehensive prospecting profile. With these data, a simulating 3D model of the granite rock-mass can be established to provide basic data for prospecting deep concealed porphyry-polymetallic ore deposits.