Advanced Materials Research Vol. 868

Abstract: From the 21st century, computers are widely used in various fields, in the mines, driven by digitization, the birth of 3Dmine make digital mine entered a new phase, Lanjiahuoshan and Jianbaobao are very important in Panzhihua mine. Based on 3Dmine’s advantages, combined with the geological conditions of two mines, this paper established the underlying database, surface models, physical models, block model. The study confirms 3Dmine digital applications in the mine and provide the basis for the mine design, measurement, the production and management.

Abstract: Based on the observation and description of single well and outcrops and the analysis of reservoir compositions, petrology, clastic structure and sedimentary structure,this paper determines the sedimentaty facies characteristics of Tanzhuang formation. The types of sedimentary facies in late Triassic epoch are delta front,shallow lake and semi-deep lake. The delta front develops subaqueous distributary channel, mouth bar and distal bar. Lacustrine facies develops shallow lake mud, shallow lake sand bar, turbidite sand and semi-deep lake mud.The reservoir rock formations in this area are lithic sandstone,feldspathic lithic sandstone with high content of feldspar and debris.The sedimentary structures include ripple, scour surface and cross-bedding are identified.

Abstract: Based on the elastic wave equation, high-order finite-difference schemes for reverse-time extrapolation in the space of staggered grid and the perfectly matched layer (PML) absorbing boundary condition for the equation are derived. Prestack reverse-time depth migration (RTM) of elastic wave equation using the excitation time imaging condition and normalized cross-correlation imaging condition is carried out. Numerical experiments show that reverse-time migration is not limited for the angle of incidence and dramatic changes in lateral velocity. The reverse-time migration results of normalized cross-correlation imaging condition give the better effect than that of excitation time imaging condition.

Abstract: The Hei47 block, typical tectonic reservoir of the Daqingzi oil field, the west fault of which has great influences on distribution of the remaining oil. Basing on the foundation of 3D geological model of Hei47 block, using the black oil E100 of ECLIPSE software to build the numerical simulation, we found that the remaining oil distribute in the non－injection region，and the peak area is mainly near the west fault.By means of integration of 3D geological modeling and reservoir numerical simulation technology，we can forecast the results of different injection-production ratio and production speed, and choose the best reservoir development scheme. This can be fine guidances for oilfields to establish the potential solutions and improve the recovery ratio.

Abstract: Adsorption capacity is a fundamental property of shale gas content that is vital to estimation of the shale gas in-place, which is controlled by organic matter (OM) and clay mineral (CM). The adsorption behavior of CM is easily neglected because of the capacity of OM is much more powerful. In this study an improved Langmuir model with adsorbents which including OM, CM and other minerals (Oth) based on adsorption experiments results on four mudstone samples in Northern Songliao Basin was set. The given Langmuir volume (V_L) and Langmuir pressure (P_L) are applied to geological conditions in terms of the empirical formula. Results show that adsorption capacity of CM account for 30% ~ 70% which cannot be ignored in continental lake basin in OM-rich shale (TOC=1%~6%). The verifications for the new model with experimental results in other basins are correct and reliable. Therefore, a new method could be used to predict adsorption capacity of shale reasonably.

Abstract: Fractures control the distribution of tight sandstone gas reservoirs in the Second Member of Xujiahe Formation in the north of western Sichuan foreland basin. According to the data of filed outcrops, cores, image logs, slice and experimental analysis, we analyzed the genetic types, development characteristics, formation periods and forming mechanism of the fractures in the study area. Tectonic fracture and diagenesis fracture are the two types of fracture in the Second Member of Xujiahe tight sandstones. Between the two types, tectonic fracture is the main. They are mostly shear fractures with three sets of NEE-SWW, NNE-SSW and NW-SE orientations. Structural shear fractures mostly developed under the tectonism of the end of Indosinian, Yanshan and Himalaya stage. The force that formed tectonic fractures came from compression of Longmen Mountain and Micang-Daba Mountain, overpressure formed from deep buried and stress caused by uplift.

Abstract: Orefield structures of Fankou lead-zinc deposit in Guangdong province is complex and have been argued about for years. By means of comprehensive study of indoor and outdoor,The lambda-type structure made of major fault of F₂₀₃ of strike northwest and branch fault of F₃, F₄ of strike northnortheast is ore-controlling structure, which not only controls the shape, the occurrence and spatial distribution of the ore body, but also controls the formation and distribution of the deposit.Key region of next prospecting is near fault of northnortheast direction of hangingwall block of the F₂₀₃.Key words:Pb-Zn ore deposit;Ore-controlling structure;Fankou in Guangdong Province, China

Abstract: inchanggou lead-zinc mining area, Ningnan county, Sichuan province is a medium reserves ore deposit in recent years. In order to study origin of the deposit,lead and sulfur isotopic geochemical features of the deposit must be research. In the deposit,mean value of ²⁰⁶Pb／²⁰⁴Pb of 9 samples is 0.285 (from 18.116 to 18.401), mean value of ²⁰⁷Pb／²⁰⁴Pb is 0.098 (from 15.658 to 15.756),and mean value of ²⁰⁸Pb／²⁰⁴Pb is 0.635 (from 38.249 to 38.884).which show lead of the ore deposit come main from upper earth's crust and few from orogenic zone. Average value is δ34S in the lead-zinc ore is 15.02 per thousand(from 5.8 per thousand to 20.32 per thousand), with positive value of sulphur isotopic composition. It is shown as heavy sulfur-rich, which is similar with composition characteristics of δ34S of seawater evaporate. The deposit is a strata-bound deposit with multi-material source.

Abstract: Based on stream sediment geochemical anomalous features of molybdenum element in China, this paper studied the main zoning of geochemical anomalous features of molybdenum element. At the same time, geochemical anomalous features and genesis of molybdenum element in different types of uranium deposits in Uranium resources potential evaluation were analyzed. Research shows that, molybdenum is an important dedicator element in uranium geochemical exploration, though there is some difference of geochemical anomalous features in different types of uranium deposit. Molybdenum element played an important role in prediction of further ore-prospecting of carbonaceous-siliceous-argillaceous, volcanic and sandstone uranium deposit. By combining the analysis of geological factors such as rock formation, succession of strata, structure, molybdenum element geochemical anomaly helps to improving prediction accuracy of uranium resources potential evaluation.