scholarly journals Geological factors of gassing of the east inclined longwall # 3 of m3 bed at O.F. Zasiadko mine

2019 ◽  
Vol 109 ◽  
pp. 00078
Author(s):  
Liudmyla Pymonenko ◽  
Andrii Karhapolov ◽  
Liubov Kuznetsova ◽  
Oleksii Prykhodchenko ◽  
Dmytro Hunia
Keyword(s):  
Gravity Data ◽  
Local Structures ◽  
Map Construction ◽  
Geological Conditions ◽  
Geological Factors ◽  
Geological Factor

The paper deals with the fact that gassing of the East inclined longwall (EIL) # 3 of the m3 bed at the «O.F. Zasiadko mine» are caused by a combination of mining-geological conditions. The main geological factor is the presence of a synclinal fold, characterized by increased fracturing. The map construction of local structures, the use of gravity data and seismological observations allow to effectively isolate gas-saturated zones and, therefore, correct degassing projects and parameters of ways to prepare workings.

scholarly journals Mineralogical and Geochemical Characteristics of Lithium and Rare Earth Elements in High-Sulfur Coal from the Donggou Mine, Chongqing, Southwestern China

Minerals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 627
Author(s):  
Jianhua Zou ◽  
Longfei Cheng ◽  
Yuanchen Guo ◽  
Zhengcheng Wang ◽  
Heming Tian ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Raw Materials ◽  
Geochemical Characteristics ◽  
Critical Elements ◽  
Geological Factors ◽  
Potential Alternative ◽  
Geological Factor ◽  
Alternative Sources ◽  
Coal Measures

Coal and coal by-products are considered as the potential raw materials for critical elements (e.g., rare earth elements, Li, Ga, Ge, etc.), which have attracted much attention in recent years. The purpose of this study is to investigate the mineralogical and geochemical characteristics, and controlling geological factors of lithium and rare earth elements in the Lopingian (Wujiaping Formation) coal from the Donggou Mine, southeastern Chongqing Coalfield, China. Results indicate that lithium and rare earth elements are significantly enriched in the Donggou coals, which could be new potential alternative sources for critical elements. Concentrations of lithium and rare earth elements in the Donggou coals gradually increase from top to bottom. Lithium is mainly associated with kaolinite, while rhabdophane, florencite, goyazite, and xenotime are the main hosts of rare earth elements. The controlling geological factor is the groundwater leaching of underlying tuff, and to a lesser extent, the terrigenous clastic materials input from the top layer of the Kangdian Upland. This study provides mineralization information for lithium and rare earth elements exploration in coal measures.

Features of filling reservoirs with hydrocarbons in the territories with a low maturity of the oil and gas parent rocks (a case study of Jurassic hydrocarbon traps in the Uvat district)

2021 ◽  
pp. 21-35
Author(s):  
O. V. Elisheva ◽  
M. N. Melnikova ◽  
M. M. Kudrayvtseva ◽  
I. O. Baburina
Keyword(s):  
Oil And Gas ◽  
Sedimentary Cover ◽  
Great Influence ◽  
Lateral Migration ◽  
Bazhenov Formation ◽  
Local Structures ◽  
Hydrocarbon Traps ◽  
Parent Rocks ◽  
Geological Factors

The article is devoted to the results of an analysis of geological factors that had a great influence on the filling of Jurassic traps with hydrocarbons. Based on the results of paleotectonic analysis, three key stages of reconstructions of the structural plans of sedimentary cover deposits were identified. Each stage was characterized not only by the appearance of new traps in the interval of Jurassic deposits, but also by the sinking of rocks of Bazhenov formation to a certain depth. It is revealed that in most of the territory of the Uvat district, Bazhenov formation didn't have time to fully realize its hydrocarbon-generating potential. In the Central and Eastern regions it entered the main zone of oil formation only in the Paleogene. Since the development of the relief of modern structural plans of Jurassic deposits in this area occurred in several stages, both the formation of traps and the lateral migration of hydrocarbons also occurred in stages. The first stage of migration occurred at the boundary of the lower and upper Cretaceous, the second stage occurred at the beginning of the Paleogene. As a result, the combined influence of lateral migration of hydrocarbons and the gradual formation of local structures in different areas of the Uvat district led to selective filling of Jurassic hydrocarbon traps.

Rock Slope Stability Analysis Based on FLAC3D Numerical Simulation

2012 ◽  
Vol 170-173 ◽  
pp. 375-379
Author(s):  
Hao Wang ◽  
Zi Xiong Chen ◽  
Dong Ming Zhang
Keyword(s):  
Stability Analysis ◽  
Slope Stability ◽  
Rock Slope ◽  
Static Stability ◽  
Slope Stability Analysis ◽  
Slope Instability ◽  
Rock Slope Stability ◽  
Economic Losses ◽  
Geological Conditions ◽  
Geological Factors

The rocky slope instability has brought great danger to human activity, and often causes economic losses, property damage and casualties, also can cause huge overhead expenses. Rock slope stability analysis must understand the geological conditions as the foundation, be under the analysis to effects of geological factors of rock slope stability, be under the premise of analysis to the engineering geological factors and then make evaluation, this is the best method of analysis and evaluation of stability of rock slope effective. This paper utilizes quick Lagrange difference analysis (FLAC3D) to Zhu Jiadeng landslide in Chongqing, the numerical simulations are to determine the landslide static stability, and provide the basis for management.

scholarly journals LANDSLIDE AT TSAKONA AREA IN ARKADIA PREFECTURE. GEOLOGICAL CONDITIONS AND ACTIVATION MECHANISM

2004 ◽  
Vol 36 (4) ◽  
pp. 1862
Author(s):  
Λ. Σωτηρόπουλος ◽  
E. Λυμπέρης ◽  
Α. Σιγάλας ◽  
Α. Ντουρούπη ◽  
Κ. Προβιά ◽  
...  
Keyword(s):  
Lower Cretaceous ◽  
Upper Cretaceous ◽  
Road Construction ◽  
Upper Jurassic ◽  
Activation Mechanism ◽  
Tectonic Deformation ◽  
The Road ◽  
Geological Conditions ◽  
Geological Factors ◽  
Geological Formations

The geological conditions of the landslide's area, at Tsakona, in Arkadia Prefecture, are examined, as well as the factors that influenced the landslide's evolution. The landslide occurred at a distance of 15 km south of Megalopoli, on the New Highway, connecting Tripoli to Kalamata and constitutes one of the larger road landslides that have ever taken place. It occupies an area of a length of 1200m and a width of 300m. Geotectonically the landslide's region is placed in a block of the Pindos zone, thrusted on the Gabrovo-Tripoli zone. The geological formations that comprise the closer geological frame, consist of the formation of "First Flysch", Upper Jurassic - Lower Cretaceous and of the Upper Cretaceous limestones. The geological factors that drastically influenced the landslide's activation are lithological, tectonic, hydrogeological and morphological. The mainly siltstone lithology of the flysch, the intense tectonic deformation that occurred during the alpidic horogenetic phase, the morphological depression that is formed by the landslide's region and the large quantities of groundwater supplied by the uphill limestone, are the main geological reasons that activated the landslide. It should be emphasised that the activation and evolution of the landslide were greatly influenced by human activity during the road construction.

scholarly journals Periglacial landforms and the geological controlling factors: examples from the highest mountains of the Balkan Peninsula

2021 ◽  
Vol 44 ◽  
pp. 39-47
Author(s):  
Emil Gachev
Keyword(s):  
Balkan Peninsula ◽  
Controlling Factors ◽  
High Mountain ◽  
High Mountains ◽  
Composition And Structure ◽  
Geological Conditions ◽  
Rock Glaciers ◽  
Geological Factors ◽  
Mountain Environment ◽  
Tectonic Settings

Periglacial landforms are typical features of the high mountain environment on the Balkan Peninsula. Their formation and diversity is determined by climatic, topographic and geological factors. Presently active periglacial processes occur above 1700-2000 m a. s. l., while relict features are observed down to 1100-1400 m a. s. l. Among the most prominent periglacial landforms are the extensive talus screes and fans, the numerous rock glaciers (especially in Rila, Pirin, Shar and Prokletije Mountains) – considered mostly relict – and nivation features (nivation cirques, long-lasting snow patches), as well as cryo-clastuc landforms (stone seas and strips). The present study aims to focus on the importance of geological conditions (bedrock composition and structure, tectonic settings) for the diversity and style of periglacial landforms – a factor, whose role has often been underestimated. The analysis and the derived conclusions are based mainly on regional and local comparisons between the high mountains throughout the peninsula.

scholarly journals Prediction of Jacking Force in Vertical Tunneling Projects Based on Neuro-Genetic Models

2021 ◽  
Vol 9 (1) ◽  
pp. 71
Author(s):  
Xin-Jiang Wei ◽  
Xiao Wang ◽  
Gang Wei ◽  
Cheng-Wei Zhu ◽  
Yu Shi
Keyword(s):  
Output Parameter ◽  
Geological Condition ◽  
Construction Process ◽  
Soil Pressure ◽  
Tunneling Method ◽  
Geological Conditions ◽  
Input Parameters ◽  
Ann Models ◽  
Geological Factor ◽  
Jacking Force

The vertical tunneling method is an emerging technique to build sewage inlets or outlets in constructed horizontal tunnels. The jacking force used to drive the standpipes upward is an essential factor during the construction process. This study aims to predict the jacking forces during the vertical tunneling construction process through two intelligence systems, namely, artificial neural networks (ANNs) and hybrid genetic algorithm optimized ANNs (GA-ANNs). In this paper, the Beihai hydraulic tunnel constructed by the vertical tunneling method in China is introduced, and the direct shear tests have been conducted. A database composed of 546 datasets with ten inputs and one output was prepared. The effective parameters are classified into three categories, including tunnel geometry factors, the geological factor, and jacking operation factors. These factors are considered as input parameters. The tunnel geometry factors include the jacking distance, the thickness of overlaying soil, and the height of overlaying water; the geological factor refers to the geological conditions; and the jacking operation factors consist of the dead weight of standpipes, effective overburden soil pressure, effective lateral soil pressure, average jacking speed, construction hours, and soil weakening measure. The output parameter, on the other hand, refers to the jacking force. Performance indices, including the coefficient of determination (R2), root mean square error (RMSE), and the absolute value of relative error (RE), are computed to compare the performance of the ANN models and the GA-ANN models. Comparison results show that the GA-ANN models perform better than the ANN model, especially on the RMSE values. Finally, parametric sensitivity analysis between the input parameters and output parameter is conducted, reaching the result that the height of overlaying water, the average jacking speed, and the geological condition are the most effective input parameters on the jacking force in this study.

scholarly journals Structural Interpretation of the Qingdong Area in Bohai Bay Basin from Shipborne Gravity Data

2015 ◽  
Vol 22 (s1) ◽  
pp. 100-105
Author(s):  
Chunguan Zhang ◽  
Jingguo Chen ◽  
Mingyi Song ◽  
Jinkuan Wang ◽  
Bingqiang Yuan
Keyword(s):  
Gravity Data ◽  
Fault System ◽  
Bohai Bay ◽  
Rift Basin ◽  
Bohai Bay Basin ◽  
Local Structures ◽  
The North ◽  
Dongying Depression ◽  
Geological Implications ◽  
Tectonic Features

Abstract The Qingdong area, located in Bohai bay basin, was suspected good exploration prospects. In order to study tectonic features and find out favourable petroleum prospects in the area, the gravity data at a scale of 1:50,000 were interpreted. This paper, through data processing and synthetic interpretation of the high-precision gravity data in the area, discusses characteristics of the gravity field and their geological implications, determines the fault system, analyses features of the main strata, divides structure units and predicts favourable petroleum zones. The results showed that the faults controlled the development of the Mesozoic and Cenozoic strata and the distribution of local structures in this area. The study revealed that the Qingtuozi uplift and the Kendong uplift in the north were formed in Mesozoic, and the Qingdong depression in the middle was the rift basin in Mesozoic and Cenozoic. Thicker strata in Mesozoic and Cenozoic developed in the Dongying depression and the Qingdong depression, so there is abundant hydrocarbon in these two depressions, and then the Guangligang rise-in-sag and the Qingdong rise-in-sag developed in the center in these two depressions are also favorable places for prospecting

scholarly journals Soil Classification and Seismic Site Response Analysis for Some Areas in Hanoi City

2018 ◽  
Vol 34 (1) ◽  
Author(s):  
Giang Kien Trung ◽  
Nguyen Duc Vinh ◽  
Dang Thi Men
Keyword(s):  
Site Response ◽  
Ground Vibration ◽  
Soil Classification ◽  
Response Analysis ◽  
Borehole Data ◽  
Local Site Effects ◽  
Local Site ◽  
Seismic Site Response ◽  
Geological Conditions ◽  
Geological Factors

Abstract: Along with the development of urban and modern life, Hanoi Capital has been constructing more and more sky buildings, big bridges and huge underground constructions. According to historical studies, Hanoi is a region located on the weak soil ground which has a rather thick sedimentary layer, complicated geology structure and shallow ground water aged in the Holocene and Pleistocene. Hanoi city is cut through by a Red River fault which has been considered to be a strong active fault zone. As a consequence, it is able to cause earthquakes with magnitude M = 6.1 corresponding to the 7th ground vibration level in intensity. In order to predict the casualty of this severe earthquake being able to happen, it is surely essential to assess both seismic site response and geological conditions in Hanoi. In the paper, we will analyze the soil ground data and borehole data obtained in this region to find the specific geological factors which are put into the DeepSoil Program to evaluate local site effects.

scholarly journals Geodynamic and geological factors in the formation of large hydrocarbon deposits in subsalt sediments of the North Caspian region

2020 ◽  
Vol 63 (2) ◽  
pp. 47-60
Author(s):  
S. A. Aliyeva
Keyword(s):  
Subduction Zones ◽  
Oil And Gas ◽  
Upper Devonian ◽  
Lower Permian ◽  
Northwestern Part ◽  
Caspian Region ◽  
The North ◽  
Geological Conditions ◽  
Geological Factors ◽  
Hydrocarbon Deposits

Background. The Astrakhan-Primorsk region of oil and gas deposits located in the North Caspian region is one of the world’s largest reserves of hydrocarbons. This region stretches from land in the northwestern part of the Caspian basin, through the northern waters of the Caspian, to the south-eastern land part of the region under consideration.Aim. To identify geodynamic and geological factors in the formation of large hydrocarbon deposits in subsalt sediments in the complex structure of the North Caspian region of the Caspian syneclise. Materials and methods. An analysis of data on the geodynamic and geological evolution of the North Caspian region of the Caspian syneclise revealed specific features of its geological structure and development.Results. The nature of the formation series, as well as the geodynamic and geological conditions (the presens of spreading and subduction zones that caused an intense heat flow, the presense of an isolated sedimentation basin with intensive accumulation of carbonates in the Upper Devonian-lower Permian, a powerful salt-bearing Kungurian cap) were favourable for the generation, migration and accumulation of hydrocarbons in large tectonic-sedimentary Upper Devonian–Lower Permian uplifts characteristic of the Astrakhan-Primorsk oil-and-gas bearing region of the North Caspian. These uplifts were formed by shelf bioherms, barrier reefs and large reeftogenic atolls and emerged through ancient troughs. The large hydrocarbon accumulations, such as Kashagan, Tengiz, Astrakhanskoye and Korolevskoye, with high specific hydrocarbon reserves (more than 100 thousand/km2) are associated with these troughs.Conclusion. During the Upper Paleozoic, the main paleodepressions of the isolated basin of the North Caspian underwent a steady and long-term subsidence process, favourable for the accumulation of a thick stratum of carbonate (mainly reef) formations. This period was also characterized by the geothermal and baric conditions necessary for the transformation and subsequent migration of hydrocarbons from oil- and gas-producing complexes to reservoirs, which were mainly presented by massive carbonate formations of reef genesis. The as-formed deposits were preserved by thick salt-bearing Kungurian sediments. Directions for prospecting and exploration works aimed at discovering new hydrocarbon deposits in the subsalt sediments of the region were outlined.

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